Dave Richards AA7EE

September 19, 2012

Courtesy Of F5VJD – A Working G4JST/G3WPO DSB80 80M DSB Transceiver!

Filed under: Amateur Radio,Ham Radio,QRP,Uncategorized — AA7EE @ 5:03 pm
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As I’ve explained in earlier posts, my interest in the G4JST/G3WPO DSB80 rig goes back a long way – back to the mid 1980′s in England when I read the description of this little rig in Ham Radio Today and scratched together the money to buy the basic kit. An enclosure was also available but I didn’t have enough money for that as well, so built it into an aluminum enclosure I already owned. That little rig gave me much fun until one day in my apartment in Hollywood in the mid-1990′s when I accidentally connected the 12V power to it the wrong way round and it instantly stopped working. I didn’t have the patience, time or experience to get it working again, so (and it pains me to say this) I tossed it into the trash. There have been several times since then that I have regretted doing that, and since then, the inability to see my DSB80 only served to further memorialize that rig in my mind.

Recently I dug up the reprint of the article that came with the DSB80 kit (I did keep that) and tried to rebuild it Manhattan style – here and here.  The receiver worked as well as I remembered the original working, but I experienced a problem with the transmission of a residual carrier on transmit. After a few weak attempts to cure that issue, I shelved it in favor of other construction projects. It’s a weakness of mine – if something doesn’t work well the first time I switch it on, unless the fix is relatively simple, I don’t always pursue it. I didn’t consider it a failure, as the receiver worked well – and it was wonderful to once again listen to a direct conversion receiver that utilized a diode ring DBM . The TX seemed to work up to and including the final,  so there was really not that much to troubleshoot if I ever wanted to give it another go.

Then a very exciting comment was left by Richard F5VJD on the blog post about my DSB80 build. It read as follows -

“Hello Dave

I also built one of these in 1983 and I still have it… but like you I fried it during a fit of nostalgia.

I do still have the original instruction sheets and the original Ham Radio Today articles which I could copy and send you if you like… and as I can’t really see myself replacing all the fused components in the RX, I would also be happy to send you the radio if you promise to repair and use it. It has some nostalgia value for me because it was the first kit I ever built and I had my first ever QRP QSO using it, so it would be nice if it was back on the air again after all these years.

Let me know what you want to do and I’ll get things started my end.

73

Richard”

Well, how do you think I replied? This was a chance to see that little rig again – and to see how another ham had built it too.  Richard told me that he had used the original case suggested by Frank and Tony, so I was curious to see a more “original” version of the DSB80 than mine was.  Richard packed up the mighty little transceiver and even took a picture of him with it outside his home in Northern France to mark the beginning of the journey to it’s new home in California:

About a week later, it turned up on my doorstep in California:

Wow – talk about well-packed! The DSB80 was very well protected with much packing material, and Richard had written his address inside each layer while packing, just in case it became partially unwrapped in transit.  We needn’t have worried, as it made it’s way to me in one piece. It’s just as well that I’m patient, as it must have taken the best part of 10 minutes before I finally saw the object of my desire. What a great looking transceiver! As well as the several address labels in the package (including one taped to the rig itself), there was an envelope inside the enclosure, with a note from Richard and some extra J310′s and BC182′s. The BC182′s are near-equivalents to the BC238′s and BC239′s used in mic amp, AF pre-amp and RF driver.

I could barely wait to open it up and see that circuit board once again:

I could hardly contain myself.  It was so great to see that circuit board that I remembered so well from my youth.  Notice Richard’s ingenious use of Meccano to help support the mounting bracket for the tuning capacitor. I think that Meccano sets were called Erector sets in the US:

Here’s a view from the other end of the rig, showing the input/output bandpass filter, with the 2 inductors wound on T68-2 cores. Fixed to the back of the case, that board with the relay gives full break-in operation:

In case you’re not familiar with the architecture of this rig, or don’t remember my previous posts on the subject, it is a CW and DSB transceiver based around a Mini Circuits SBL-1 diode ring double balanced mixer package.  The SBL-1 was rated down to 100KHz so gives excellent out of band rejection at the design frequency of 3.5MHz. My earlier Manhattan version used an ADE-1 which is only rated down to 1MHZ, but there was not a trace of any out-of-band breakthrough.  Here’s a block diagram and device breakdown:

Block diagram and device breakdown of the G4JST/G3WPO DSB80 80M CW/DSB transceiver, details of which were first published in the March 1983 edition of the UK magazine “Ham Radio Today”.

This DSB80 of Richard’s had been inadvertently connected to 12V with reverse polarity, just as I had done with mine. The first order of the day was to remove the board from the case and, well, make it work again! Richard mentioned that one or two of the electrolytics had exploded, so I knew that at the very least, I’d need to change some of the electrolytics and one or more active devices.  On getting the board out of the case and onto the workbench, one of the big advantages of boards without plated-through holes became apparent – with the help of desoldering braid, it was very easy to remove old components and replace them with new ones. After replacing the big electrolytics that performed service as smoothing capacitors for the 12V supply (one of which had very obviously exploded) I realized that it would be very little trouble to go ahead and replace every single electrolytic. After all, the rig was about 25 years old, and those caps might be getting a bit dry by now.

After replacing all the electrolytic capacitors (even the small signal ones – including replacing the 1uF electrolytic in the diplexer with a polyester cap just for good measure), I connected wires for the volume pot, antenna and speaker, connected a 12V supply (the right way round this time!) turned the volume up and – as predicted – heard absolutely nothing. This was not a surprise as I had a feeling that amongst the devices well and truly cooked would have been the LM380.  This rig used the 14-pin version of the LM380 and I had planned in advance and purchased one. In it went (thank heavens for de-soldering braid!) On re-applying power, I heard hiss in the speaker, and on touching the input to the DBM, I heard atmospheric noise.  It couldn’t be this easy could it? Well yes, it could!  Further investigation revealed that the VFO and buffer were working and the receiver was fully operational.  Not only that, but the transmitter was working too – and without the issue of residual carrier emission that I had experienced with my Manhattan version. Woohoo!

This was the point at which I became a little uncertain what to do next. I still felt that it was not really my rig – it was Richard’s that he had sent to me.  I knew that he had given it to me, but still felt a reluctance to change it too much from the way in which he had built it, for fear I was being disrespectful to the history of this fabulous piece of home-brew. After all  it was the first transceiver he had ever built, with which he had conducted several hundred QRP QSO’s.  Richard put my mind at rest by saying that it had ceased being his rig once it left his house in that brown paper package. He was happy to know that it would continue having a life in California, and wanted me to do whatever I wanted in order to “make it mine”. What a helpful and wise sentiment. I wanted to retain something of the original rig other than (obviously) the circuit board. Richard suggested that perhaps I could fabricate an enclosure from copper-clad laminate and use the original top cover. What an excellent idea!

First of all, I wanted to modify it to cover the entire US band of 3500 – 4000KHz. The original version, being a UK design, covered the UK 80M band of 3500-3800KHz. I used a different tuning capacitor – a 365pF air-spaced variable with a built-in 8:1 reduction drive that I bought new from Midnight Science. I also re-wound the VFO toroid and changed a few of the other caps in the VFO circuit to achieve a coverage of 3485 – 4019KHz.  Even with the reduction ratio of 8:1, this still gives a tuning ratio of over 125KHz per turn of the tuning knob.  In order to help, I added a fine-tuning control consisting of a 1N4001 diode across the VFO tank circuit, acting as a varactor, and tuned with a 1K linear pot. The schematic of the modified VFO, with values, is as follows:

The other modification I needed to perform was to redesign the input/output bandpass filter in order to accomodate the wider US band.  Thank goodness for the software that comes with EMRFD – the program DTC.exe makes the business of designing a double-tuned filter quite straightforward.  The filter used in the original design of the DSB80 uses taps on the inductors for impedance matching into and out of the filter, while the circuit that the EMRFD software is based on uses a tap point at the connection of 2 series capacitors.  The filter I used keeps the output of the transmitter relatively constant over the 500KHz bandwidth of the US band:

Here’s what the board looked like with the mods finished.  The redesigned bandpass filter is at the left-hand side. Just to the right of it, the ferrite toroid wound with the green wire is the transformer that matches the low output impedance of the MOSFET final to the 50 ohms the bandpass filter needs to see. The VFO coil is on the far right of the board, just above the LM380.  The double-balanced mixer package (the heart of the rig) is the silver rectangular package just to the right of center:

Here you can see a closer view of the VFO toroid.  It’s not very easy to see, but very close to, and to the right of it is the 1N4001 diode that is used as a varactor to provide bandspread. The lead sticking out to the right is for the volume control and the lead leaving the board in the foreground is for the bandspread potentiometer:

Even though this particular board is 25 years old and has been worked over a few times by my soldering iron, I still think it’s pretty nice-looking:

I have only reproduced the schematics of the parts of the circuit that I altered. It didn’t seem appropriate to show the full schematic of the DSB80 here without permission. However, although the original article doesn’t seem to be available on the internet in good resolution, it is available from the right people if you know who to ask :-)

Now that the board was fully operational in both DSB and CW, the next task was to fashion a new enclosure.  I did want to retain some of the flavor of Richard’s version of this fine little rig and had wanted to keep the 2 small pieces of Meccano that he used in his tuning capacitor mounting bracket. After the decision was made to use an air-spaced variable instead of the polyvaricon that the original used, this didn’t seem possible.  I went with Richard’s suggestion to make a new enclosure from copper-clad laminate and use the original top-cover.

I cut 3 pieces of laminate for the bottom, back and front panels, and started marking the positions of the front-panel controls on a piece of paper.  When doing this, I mark the outline of the front panel life-size on a piece of paper and keep re-arranging the controls to find a suitable layout. This picture gives you the idea, though when this picture was taken, neither the paper layout nor the partially-drilled front panel were complete. To the right of the horizontal rectangular cutout for the frequency display are 4 holes that I drilled at what were to be the 4 corners of the vertical rectangular cutout for the modulation meter.  When making square or rectangular cut-outs, I drill a series of overlapping holes around the perimeter of the rectangle, remove the center piece, and use a small file to file the edges of the cutout smooth.  It’s slow work, but with care you can make some very acceptable cutouts:

Wherever possible, I mark the cutouts and hole-centers on the copper side of the board:

The finished front panel (before I realized I was going to have to enlarge the hole for the main tuning capacitor) -

The finished 3 panels with all cutouts and holes.  I think I might have cleaned and lacquered the boards at this point.  I scrub the boards clean with a Scotch-Brite pad, a little dish soap (washing up liquid for the Brits!) and plenty of elbow grease. This was the first time I decided to drill extra holes for those little “spigots” that help to keep switches and pots from rotating off-center -

 I use a hand punch to make holes wherever possible. It’s quicker and more convenient than drilling.  For larger holes, I start with a hole made with the punch, then enlarge it with a T-handled reaming tool. I got lucky and bought my punch from Harbor Freight for around $20.  They don’t carry this anymore, but similar punches are available online.  Mine came with a series of different-sized dies and looks like this:

I think it turned out pretty well:

Aw heck – I’m just dying to show you how the rig looks in it’s new case with it’s fancy digital display from N3ZI. The 2 knobs on the upper left hand side are the volume and bandspread respectively. Under the bandspread knob is a switch that will be used to switch between 2 different bandwidths when I fit a single-stage audio filter in between the AF pre-amp and the LM380 output stage. Under that switch is the headphone/speaker socket.  I did buy a nice speaker and grill cloth from Elecraft (a K2 replacement speaker) to fit in the top cover, but realized that drilling holes in the top cover might possibly damage the crinkle finish.  I didn’t want to risk that, so will probably live without an internal speaker.  I could always make a top cover from copper-clad laminate and drill holes in that for a speaker, but I like using the original top cover. Underneath the right-hand side of the frequency display is a toggle to switch the LCD backlighting on or off.  The meter is for monitoring modulation level in DSB transmit. The bank of switches on the far right are (top to bottom) TX/RX, DSB/CW and the on-off switch for the whole rig -

You’ll notice that I’ve used a hot glue gun to secure the VFO toroid to the board. This is also the first view of the 365pF air-spaced variable cap from Midnight Science. -

A few more views -

There are a few small issues that I’m working on. The TX does chirp a bit on CW transmit.  It didn’t do that on the bench, and I know that Richard’s version didn’t either. I’m pretty sure that a few more well-placed  RF bypass caps and/or feritte beads will cure the problem.  I think that I need to do a bit more work on how the board is grounded also.  Future projects will be to add a switchable bandwidth audio filter.  The later version of the DSB80, called the DSB2, had one, and I plan to use the same circuit.  It uses a single op-amp.  Richard’s version had a sidetone oscillator for CW and I’d definitely like to add one.  My antenna is rather inefficient on 80, so if I want much success on this band, CW will be the way to go.

Richard and I have kept up a regular e-mail correspondence in the last couple of months and in one e-mail, he told me how his DSB80 started it’s life -

A bit of history for you:  the rig first squawked it’s mighty 2 watts in anger at 00h08 27 January 1986; signals received by G4BMR Derek (599 about 40 miles away from my then QTH Swindon) but it wasn’t really the first proper QSO as I was already in QSO with Derek on 2M FM and had been for the previous 4 hours.  He was helping me to try and solve the hum, drift and chirp problems and we were also in QSO on 80M CW so all I did was just change rigs when I thought that I had the problems licked – it was quite a thrill to at last hear a nice clean CW signal coming back to me via 2M.  As soon as that had been achieved and we had swapped signal reports, Derek went QRT – not surprising after 4 hours!

I then finished boxing the little chap up but at 01h03 with the adrenalin still running high, there was only one thing for me to do and that was to call CQ.  I received an immediate response from OK3CSA Juro in Myto who gave me a 569 report;  for me, this has to be the first real QSO with the rig and also my first QRP QSO and my first QSO with something I had put together myself.  (Paper logs do still have their uses – the one in question is in front of me as I write – which is why I still to this day log this way!)

Here is that log entry of which Richard speaks – the QSO with Derek G4BMR and the first “proper” QSO, with OK3CSA -

Richard’s note continued -

Enjoy your time with your visitors and I look forward to reading the next instalment of the saga of ‘The little rig who found a new home in America…’

Well, the next installment begins here! The big success of this rig for me is that it has connected me to my ham radio past and filled in the gap on a long-lost piece of radio nostalgia.  It all happened because Richard G0BCT/F5VJD shared with me his first ever home-brew rig and allowed me to let loose on it with my soldering iron.

For that, I thank you OM!

Note – although the wiring on my version may look a bit neater, my version chirps and Richard’s didn’t.  He found that it was important to keep the various leads to the board well-separated, and I think I will end up bringing my connections out to the top of the board like he did in order to experiment with them to find a layout that works best.  He told me that his choice was between pretty yet defective, or scruffy and functional.  I am going to have to make the same decision the next time I take the top cover off this rig!

The intention when taking this photo was to set the DSB80 to 3985 – the North American QRP SSB calling frequency. It wasn’t until later I noticed that I had set it to 3895. These senior moments worry me!

PS – I liked Richard’s original version of this rig so much that I have kept the case, tuning mechanism and associated components intact in case I wish to recreate it one day.  I do like the ability to see where I am on the band with the LCD frequency display but in my opinion, his version of this DSB80 looked more like a “real home-brew rig”. I have not had a QSO with my version of the rig yet, but have spent many hours listening to it already. I love listening to this DC receiver! There is still a slight chirp for me to get rid of before I use it on CW and truth be told, I am more of a CW person than a phone person.  I was 100% phone in the earlier days of my ham career and maybe the pendulum will swing back in that direction one day but for some reason, after a working life in which I earned my living by talking (DJ’ing and voice-overs for radio and TV commercials), I now can’t think of very much to say on a microphone!  Even on CW, I tend to be more of a listener than “talker”, but I do love to listen. Besides – listening is the perfect thing to do while I’m building , and this little rig sounds great :-)

Stop Press – I fixed the chirp.  It was a wiring error on my part and a simple fix. Will explain in a future post. I also had my first QSO with the rig this evening (Oct 4th) on 75M DSB! More info to follow.

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28 Comments »

  1. Well, Dave, didn’t you do well!

    This is definitely the way I should have built the rig in the first place – fat chance given the state of my building ability (and my wallet) 26 years ago!

    Since I blew the rig up (about 15 years ago I guess) I’ve looked at it many times and promised myself that one day I would get it working again, but realistically it wasn’t going to happen – ‘one-day’ is not a day of the week after all – so I am absolutely delighted that someone with more motivation and patience than me has taken the task on and succeeded wonderfully.

    Thank you Dave for giving me so much pleasure with your regular updates over the past few weeks – I think I’ve probably enjoyed the rebuild as much as you have… and without the hard work and dedication!

    I hope you will both be happy together and make lots of fun QSOs.

    And the best bit of all is that in the process of losing an old friend to new pastures… I’ve made a new one – keep in touch Dave.

    With my very best wishes

    72/3 Richard F5VJD

    Comment by Richard Sayer — September 19, 2012 @ 9:25 pm | Reply

  2. The way you built it is very similar to the way I originally built mine Richard, and for the same reasons!

    I do hope to eventually post some recordings and/or video but have been so embroiled in this project for the last few weeks that I am going to take a break by assembling a few kits and *gasp* even doing some non-ham radio things. If nothing else, I’ll e-mail you a recording of it in action at some point.

    This was great fun!

    Comment by AA7EE — September 19, 2012 @ 9:50 pm | Reply

  3. Dave, I am once again astounded and inspired by the care and attention to detail with which you build. That enclosure is gorgeous, I hope that one day I have the patience to build so well. Congratulations on getting this piece of history – for two hams! – back on the air, and in such style!

    Comment by Robert Liesenfeld — September 19, 2012 @ 11:27 pm | Reply

    • Robert – Thank you for the very kind words. You’ve seen where I live. All it takes is not having a job and being willing to spend many long days in this room. Oh – and a low threshold of boredom helps too, as well as a plentiful supply of coffee :-)

      Comment by AA7EE — September 20, 2012 @ 5:58 am | Reply

  4. Dave, what a great story….I must admit I could not stop reading this post till the very end. Great to hear you had a DSB80 to work and to read about this friendship across the “pond” that only hamradio can help us achieve.

    Look forward to read further news about this project.
    Stefano

    Comment by Stefano IZ3NVR - KD2BGM — September 20, 2012 @ 6:55 am | Reply

  5. Thank you Stefano. I was so surprised when Richard offered to send me his rig that I just had to accept his offer, and it has been a great experience working on it. You meet the kindest and most interesting people through ham radio!

    Comment by AA7EE — September 20, 2012 @ 7:11 am | Reply

  6. As Richard’s XYL, I’d like you to endorse all that R has said about this joy-making rig. He was delighted to find a new home it and as soon as you had said YES, he was on a roll. Packing materials, labels, tape…the whole nine yards! Thrilled to know it was going to a new home, he’s been delighted and charmed by your continued contact from receeipt, progress reports and now the result. Thank you for taking the time and making the effort to give you both so much pleasure and pride.

    I look forward to reading about the working exploits of this fine, expatriate rig!

    Margaret

    Comment by Margaret Sayer — September 20, 2012 @ 4:10 pm | Reply

    • Margaret – there has been as much joy at this end, I can assure you. I have been taken aback not just by Richard’s generosity in offering me his beloved home-brew rig and allowing me the freedom to work on it, but also by his continued support and communication.

      As I mentioned to Richard, my eldest brother lives part of the time on a boat in Bristol, and the rest of the time in a small stone cottage in Northern France. You live in a lovely part of the world!

      Comment by AA7EE — September 20, 2012 @ 5:39 pm | Reply

      • So is that how it SHOULD have looked then Dad?

        Comment by Matt — September 20, 2012 @ 6:25 pm

  7. Kids eh Richard? Gotta love ‘em! Of course, he must have got that sense of humour from someone……….. :-)

    Comment by AA7EE — September 20, 2012 @ 6:30 pm | Reply

  8. What a great story and a great looking rig!

    Comment by Frank — September 20, 2012 @ 8:29 pm | Reply

  9. Great story Dave (and Richard). Here is a link to the punch:
    http://www.amazon.com/Neiko-Power-Punch-Sheet-Metal/dp/B0002T87CW/ref=sr_1_1?ie=UTF8&qid=1348262410&sr=8-1&keywords=steel+hole+punch

    Comment by Oleg — September 21, 2012 @ 11:02 pm | Reply

    • Thanks for the link Oleg!

      Comment by AA7EE — September 21, 2012 @ 11:08 pm | Reply

  10. Hello Dave,
    Another delightfully written tale, with wonderful pictures and as always excellent building skills …………and with a happy ending to boot!!
    The scary thing is that as I read your post I’m sitting at work in the centre of Swindon…. Who knows, maybe right next door to Richard’s old home?
    73s Richard M0AUW

    Comment by Richard Hull — September 24, 2012 @ 12:28 pm | Reply

    • Perhaps Richard will let us know where he used to live in the UK……..

      Comment by AA7EE — September 25, 2012 @ 1:20 am | Reply

      • Hi dave

        The callsign is difficult to apply in our country now. I do not even know to apply to the public organizations.

        I ‘m in China, where ham radio organization has stagnated .

        my email is qwb0330@gmail.com

        thank you to Reply

        Comment by qwb0330 — September 25, 2012 @ 2:45 am

      • I lived in Peatmoor – a suburb of Swindon – but I worked in the centre of Swindon for a certain large financial services company that Richard will know. I retired 11 years ago and that part of my life seems a very distant memory now!

        Just wish retirement wasn’t so damn busy!

        72/3

        Richard F5VJD

        Comment by Richard Sayer — September 26, 2012 @ 3:02 pm

  11. Hello Dave,
    Do you have a detailed schematic diagram for DSB80?
    I want to do it
    thanks。

    Comment by qwb0330 — September 25, 2012 @ 12:55 am | Reply

    • Qwb0330 – you don’t give a name or callsign, so I don’t know how to contact you. Look me up on QRZ and send me an e-mail so I can help you out.

      Comment by AA7EE — September 25, 2012 @ 1:19 am | Reply

      • Hi dave

        The callsign is difficult to apply in our country now. I do not even know to apply to the public organizations.

        I ‘m in China, where ham radio organization has stagnated .

        my email is qwb0330@gmail.com

        thank you to Reply

        Comment by qwb0330 — September 25, 2012 @ 2:46 am

      • qwb0330 – You will need a license in order to operate the transmitter in this rig. i know you understand that, but there would not be much point to you building this unless you have a license. Perhaps you’d be interested in building just the receiver section?

        Comment by AA7EE — September 25, 2012 @ 3:01 am

  12. Hi dave。

    i understand that, I am not used to Transmission 。building just the receiver that is ok。thanks。

    I feel helpless,In our province ,callsign license application has been banned。Can I apply callsign license of the United States or other countries?

    Comment by qwb0330 — September 25, 2012 @ 3:48 am | Reply

    • No – you need an Chinese license if you are a Chinese national operating from China. I’m sending you an e-mail.

      Comment by AA7EE — September 25, 2012 @ 3:55 am | Reply

  13. dear dave

    if i use SBL-1 mixer

    pin 8 link VFO(C9)
    pin 2,5,6,7 is GND
    pin 3,4 link IF (R9,C11)
    pin1 link BPF and PA (C13)

    this link is ok ?

    thanks

    Comment by qwb0330 — September 28, 2012 @ 3:15 am | Reply

    • qwb0330 (I’m sorry – I don’t know your name) – if you want to save money and don’t mind soldering surface mount devices, you can also use an ADE-1 – they cost less than the SBL-1.

      Comment by AA7EE — September 28, 2012 @ 3:18 am | Reply

      • o~my name is weibin.qian

        Thank you for your suggestion,and that Circuit link is right ?

        Comment by qwb0330 — September 28, 2012 @ 3:39 am

  14. Dave, I see you have built gear with different ICs, etc. so I’d like to get your opinion on the differences between the results of using different types of mixers. 602, 612, etc. versus the DBL, ADE, and TUF types. I guess the diodes require most LO voltage, but are the results noticeable.?

    Jack W6VMJ

    Comment by Jack Margolis — July 17, 2013 @ 11:59 pm | Reply

    • I’m not much of an expert Jack as I don’t design circuits, but merely reproduce other people’s designs. However, although the NE602/SA612 has the advantages of low current consumption, which is great for battery operated gear, and the conversion gain, which makes it easy to build simple receivers with few parts, it is prone to overload in the presence of strong signals. If you use it in the front end of a receiver (as in a simple DC receiver), you’ll have a receiver that works quite well until adjacent string signals come along, when it will fall apart. NE602/SA612′s work well when utilized in stages that take this limited dynamic range into account (2nd mixers, balanced modulators etc). If component count and power consumption are not of primary concern, the diode ring mixers, such as the ADE-1, TUF-3 etc will give much better performance in receiver front ends. I am quite partial to them!

      Comment by AA7EE — July 18, 2013 @ 12:24 am | Reply


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