Since all filtering is at 50KHz...? and 50KHz is nearly just high audio...
I wonder is an audio filter could be modified to work at 50KHz.? Inject it before the AVC and
it could be a modern rig...
73,
Gary
WB6OGD
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I'll add that a larger tip with more thermal mass will get the job done quicker. 73 -Jim NU0C On Mon, 12 Apr 2021 21:30:32 -0500 "Jeffrey Angus" <jdangus@...> wrote: On 4/12/21 7:42 PM, Paul Kraemer wrote:
Even fine wire and micro tip with the heat turned down I seem to
ruin three to get one good one made up. You're doing it wrong. A HOT tip. Get on and off quickly.
Use RMA rosin flux in addition to the core flux.
And, personally, use 63/37 solder. 0.032"
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Turn up the heat!
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On Apr 12, 2021, at 7:42 PM, Paul Kraemer <elespe@...> wrote:
?
Does anyone know of a good brand of these pesky connectors? By good I mean NOT a plastic body that melts at the mere sight of a soldering iron? I have soldered more than a few connections in my life but I really hate having to put one of these together. Even fine wire and micro tip with the heat turned down I seem to ruin three to get one good one made up. A PTFE body would be excellent but I haven't found them---yet.
Paul K0UYA
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On 4/12/21 7:42 PM, Paul Kraemer wrote: Even fine wire and micro tip with the heat turned down I seem to
ruin three to get one good one made up. You're doing it wrong. A HOT tip. Get on and off quickly. Use RMA rosin flux in addition to the core flux. And, personally, use 63/37 solder. 0.032" -- "I am a river to my people." Jeff-1.0 WA6FWI www.foxsmercantile.com
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In line audio filters are a wonderful tool. I have two different DPS boxen that I regularly use that are frankly amazing. But you have to be aware of their limitations. They won't help with strong adjacent signals that are pumping your ACG or worse. 73 -Jm NU0C On Mon, 12 Apr 2021 09:31:12 -0700 "Brien Pepperdine" <busybrian@...> wrote: Well, at risk of seeming an amalgamation of a classic snake oil salesman and revivalist 'tent meeting' speaker, I can personally attest for Dave Cripe's HiPerMite audio filter. It first appeared in 73 magazine, was revised and has been a 4Square QRP kit for some time now..... *
* I built mine and use it on many of my rigs as an external audio filter - on the R4C (even with its own filter), TR-4Cw (with and w.o its own filter), my R-390A etc. It is great. In fact, IMHO even though the one I built I did it as the zero-gain setup... I find that with my R-390A I don't have to have the RF and Audio gain pots nearly so high.. the filter seems to 'gain' the signal, FWIW, in an exemplary way. IMHO.
Additionally, my TR-7 has been put aside for now until I surrender the funds to buy a? new Noble CW filter to replace the Drake CW filters (which seem to have aged out and become hollow and ring-y in my hearing opinion... the HiPerMite made it work quite nice though).
Strongly recommended. I am not a salesman nor tent speaker and never have played one on TV nor radio..... :)
Brian VE3HI
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Try rfconnection.com.? Bob - W3DK.
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: Paul Kraemer <elespe@...> Date: 4/12/21 20:42 (GMT-05:00) Subject: [DRAKE-RADIO] DIN connectors
Does anyone know of a good brand of these pesky connectors?? By good I mean NOT a plastic body that melts at the mere sight of a soldering iron?? I have soldered more than a few connections in my life but I really hate having to put one of these together.? Even fine wire and micro tip with the heat turned down I seem to ruin three to get one good one made up.? A PTFE body would be excellent but I haven't found them---yet. Paul K0UYA
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apologies to the group for me having no reflector
Group
I'm finding out tonight I haven't received any posts on the reflector since April 9, when I first posted my question about DIN connectors but I have now read those replies in "direct" mode after I posted again and then checked to see if it made it.? So far looks like I am not getting anything "from"
Joe and I are trying to fix it.
Paul K0UYA
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Does anyone know of a good brand of these pesky connectors?? By good I mean NOT a plastic body that melts at the mere sight of a soldering iron?? I have soldered more than a few connections in my life but I really hate having to put one of these together.? Even fine wire and micro tip with the heat turned down I seem to ruin three to get one good one made up.? A PTFE body would be excellent but I haven't found them---yet.
Paul K0UYA
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Re: Where do you get an X-Lock from Now?
I've used Conny's DAFC on several TR7s since Cumbria closed. The DAFC
works very well and comes assembled with the hardware to install it in
the TR7.
![[]](/g/DRAKE-RADIO/attachment/56671/)
73, Joe Pyles KC9LAD
At 02:29 PM 4/12/2021, you wrote:
You may try Conny, DL1SDQ. He is
THE German TR7 repair guy and - amongst other services - he has a
stabilizer.
73 de Dieter DL5RDO
Am 12.04.2021 um 01:48 schrieb James Sawle (MD0MDI):
With Cumbria Designs seemingly
gone sadly, does anyone know if there is anyone making a similar device
as the X-Lock anywhere?
Kind Regards
James
MD0MDI
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OK, but still using it as a test! ? Joe ¨C W7RKN ? ? Please disregard this message.? I posted to the wrong group.
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Re: Where do you get an X-Lock from Now?
You may try Conny, DL1SDQ. He is THE German TR7 repair guy and -
amongst other services - he has a stabilizer.
73 de Dieter DL5RDO
Am 12.04.2021 um 01:48 schrieb James
Sawle (MD0MDI):
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Show quoted text
With Cumbria Designs seemingly gone sadly, does anyone know if
there is anyone making a similar device as the X-Lock anywhere?
Kind Regards
James
MD0MDI
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Sounds like the socket needs cleaning. Some DeOxit and a GUM Proxabrush
dental cleaning brush will do it.
Mike, W1NR
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On 4/12/2021 12:27 PM, John Limbach, K8NN wrote: Would be good to go except the 20M xtal has gone intermittent again.? It
seems to be something to do with the socket because if I wiggle it
crackles and eventually I can get it to a place where it will stay and
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Re: Where do you get an X-Lock from Now?
On page 13 of the following document, located on Ron, WB4HFN's web site list the 3 current stabilizers that are being sold. All work as well as another, although I've never personally had the Elcon version.?
73s,
Mark, WB0IQK
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Well, at risk of seeming an amalgamation of a classic snake oil salesman and revivalist 'tent meeting' speaker, I can personally attest for Dave Cripe's HiPerMite audio filter. It first appeared in 73 magazine, was revised and has been a 4Square QRP kit for some time now.....
I built mine and use it on many of my rigs as an external audio filter - on the R4C (even with its own filter), TR-4Cw (with and w.o its own filter), my R-390A etc. It is great. In fact, IMHO even though the one I built I did it as the zero-gain setup... I find that with my R-390A I don't have to have the RF and Audio gain pots nearly so high.. the filter seems to 'gain' the signal, FWIW, in an exemplary way. IMHO.
Additionally, my TR-7 has been put aside for now until I surrender the funds to buy a? new Noble CW filter to replace the Drake CW filters (which seem to have aged out and become hollow and ring-y in my hearing opinion... the HiPerMite made it work quite nice though).
Strongly recommended. I am not a salesman nor tent speaker and never have played one on TV nor radio..... :)
Brian VE3HI
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N4KZO de K8NN
Thanks Michael.? I had been thinking of that but in the other direction.? I managed to get the full alignment procedure done while all three were oscillating.
Would be good to go except the 20M xtal has gone intermittent again.? It seems to be something to do with the socket because if I wiggle it crackles and eventually I can get it to a place where it will stay and oscillate.? However, any vibration on the bench causes it to move minutely but enough to cause it to stop oscillating again.? Would like to reflow the solder joints on that portion of the crystal socket but it's hellish difficult to access and don't think its possible to get the soldering iron in there.? Moving the pins worked well on the 40 and 15M xtals and they seem firmly in place and are oscillating their little hearts out.
I've got a brand new 20M xtal inbound and will try that out and in the meantime see if I can poke around from the bottom and see if I can find anything intermittent there.
Other than that, it works great.? Going to stick a themistor in the AC line input just on general principles.? The receiver appears to be quite sensitive although it doesn't receive anything but the signal generator here in the basement.? Would like to get this one put to bed, put it on the market and move on to the other 2B I have that apparently has a hellishly loud parasitic oscillation that appears as soon as it's turned on.
Thanks again and I'll keep you advised.
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NM0S has designed a narrow 200 CW filter that has no ringing. ?
The QRP Labs QCX QRP rigs use that design and I can attest to the effectiveness of that CW filter. One of my many projects is to build that filter for my R-4B.
The Four ?State QRP group sell a kit based on NM0S¡¯s?design. ?See?
That CW filter is way better than the DSP ?one in my ICOM 746 PRO!
--
73, Bernie. VE3FWF
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Test Send for Paul Kraemer
Paul, are you getting this? ? Joe ¨C W7RKN
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yes the xtal/vfo switch is clean, in fact at one point I had it jumped out to make sure.? I was reading LO and PTO at V8 socket pins with a scope.? I? have hit the tube socket with contact cleaner. Yes the xtal switch was in Normal and I was seeing the correct LO frequency per band switch position.? Thanks for your reply Peter.
Ronald Brown 701.520.3478
-------- Original Message --------
Subject: Re: [DRAKE-RADIO] r4b revival
From: "VE7PS" < ve7ps@...>
Date: Mon, April 12, 2021 12:26 am
To: [email protected]
Ron: Curious exactly where you were checking for the PTO signal and the LO signal?? Those signals may not be getting to the cathode/grid of V-8 if the switch S-4 is in the wrong position ("VFO" is correct) or is dirty.? I realize you mentioned you had cleaned the switches, but this one, on the side of the receiver, isn't always obvious, and I have had trouble with these slide switches on many Drake rigs, especially the 4-line transceivers and the SC-2 rx converter. Also make sure the XTALS switch is in the NORM position and ensure it is clean as well. Keep us posted. 73 Peter VE7PS On 2021-04-11 8:17 p.m., Ron K0IDX wrote:
I have been working on this R4B for awhile now. recapped and cleaned all switches. I verified good LO and PTO signals to the premixer with an oScope.. However V8, the premixer, is not doing its thing. I have new , tested 6hs6's for both v2 and v8. Voltages check ok except for v8 pin6 which is 145vdc with d14 out of circuit or 108 with it in, normal would be 120. Resistance at pin 6 runs high at 18.6k instead of 12k. R50 is good at 22k.? The pin1 grid shows 0v. Plate p5 is 145v.? ?at pin7 v2 cathode I see a few mv of the LO frequency, not the desired LO - PTO frequency.? ?Have tried alignment paying attention to tuned circuits with T3 and T4, the trimmer caps associated with T3 are not responsive, neither do the trimmer caps at T4 make any difference. I verified the measurement of the slug positions on the preselector rack.? Complicating troubleshooting is the calibrator not working however v1 and trimmers are working with external sig generator.? 5595khz LO2 is good at v3 but I'm not that far yet.? Any input or next step direction would be greatly appreciated as I seem to have begun to go in circles with this. At my age thats not unusual..... ron?
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Re: Where do you get an X-Lock from Now?
After 15 years of producing kits for the Amateur Radio enthusiast,?
Ron and Gill Taylor of Cumbria Designs (UK) ceased their business on 17th December 2018.
?
The Cambria Designs X-Lock was a popular product during this time.
Review at eHam.net
Roland Elmiger, HB9GAA founder of ELcon Engineering (Switzerland)
is now offering the universal ELcon EL-34, FLL-VFO Stabilizer.
A nice FLO-VFO Stabilizer replacement for the discontinued X-Lock.
¡ª
Universal FLL-VFO Stabilizer EL-34 (kit or assembled), 45.00 Swiss Francs.
?
ELcon EL-34
===
Good Luck.
greg, w9gb
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John,
I am thankful that the oscillator is working now for all bands. ?You are welcome for any helpful suggestions. ?You have observed that sudden oscillation occurs when all conditions for oscillation are met, just as it should.
Concerning the crystal pins loose in their sockets, I assume the crystal holders are either HC-6/U or HC-48/U, same dimensions with both. ?In my 2-B, each crystal has both pins bent, very slightly toward each other to create a transition fit with the socket. ?The bend occurs at the holder insulated wall, as if someone gently pushed on the end of each pin toward the other, or used smooth-jaw pliers to make the bend. ?The offset from the perpendicular position measures 0.01 inches, using a Vernier caliper. ?The pin diameter measures 0.05 inches. ?Check your crystals. ?If you don¡¯t see this slight offset from perpendicular, bend each pin toward each other for a transition fit. ?My crystals plug into their socket smoothly, and quite snugly, all the way. ?I expect that the socket barrels flex from perpendicular, conforming to the offset in the pin, when the crystal is inserted, creating the secure transition fit.
73,
Michael Smith, N4KZO
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Gary WB6OGD
Jim Shorney
Ham Radio
Greg W9GB