Re: Tuned input
No, you are right Mike. It was WD7S. Alek.
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Alek Petkovic
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#39918
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Re: Tuned input
That call does not seem like the one I was thinking about. Seems it was W7__? __? ? I could be wrong.
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mike repinski
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#39917
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Re: Tuned input
I have the AT100 AMP board with the special PIC. I believe the chip is common but I don't think I know anyone that can copy them. 73, Alek VK6APK
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Alek Petkovic
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#39916
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Re: Tuned input
W7IUV. Discontinued long ago. Alek VK6APK
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Alek Petkovic
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#39915
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Re: Tuned input
Wasn't there a 7 call ham that made such a board? Think he also made high voltage boards.
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mike repinski
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#39914
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Re: Tuned input
I suppose the answer to that would be to disconnect power to the tuner after it's done its job.... Or rewire it so it only tunes when power is applied, then you remove power to keep it from
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Steve
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#39913
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Re: Tuned input
The amplifier version of the AT100 tuner has different stuff programmed into the PIC chip. 73, Alek VK6APK
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Alek Petkovic
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#39912
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Re: Tuned input
I just bought two of them for $5 each at a local radio club auction, configured as coax-fed remote antenna tuners (RT-100 and RC-100, no longer sold) intended to be mounted at the antenna, complete
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Steve
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#39911
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Re: Tuned input
They stopped making that unit years ago. I tried using the at100 remote ldg. It decided to tune while I was transmitting. That was it. Smoked. C
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W7WRX
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#39910
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Re: Tuned input
Hi Tuner-Seeker W7WRX! I believe that LDG makes a board-size tuner just for amp builders. 7 Band, 9 Band, I'm not sure. But they advertise in QST. They've been doing that for years. Happy New Year
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HaL Mandel
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#39909
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Tuned input
I am thinking of adding a tuned input to one of my amps.? Does anyone make a board?? I searched around and there seems to be nothing available. Does anyone have a board laying around?? Maybe from
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W7WRX
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#39908
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30L-1 ALC
What negative voltage ranges should a find in this amplifier¡¯s ALC circuitry? I know it depends on the setting of the pot. Just curious about what variation I should see. Richard WB5NEN
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Richard P
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#39907
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Re: Building my first amplifier. Where to start?
Just check the FU-81(GU-81M) amplifier, the screen grid current is 260mA for two tubes.so I guess 130mA per tube.Don't believe the rumors that the GU-81M won't work at 21MHz and above. This is
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Hsu
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#39906
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Re: Building my first amplifier. Where to start?
Hsu, Thanks for the details on the gu81m tubes. They look great too. Too pretty to be hidden. I have settled now on two gu43b tubes. Should be happy at 2kw and push to 3kw if needed.
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desmond auld GI0UTE
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#39905
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Re: Building my first amplifier. Where to start?
Hal, When I got the transformer I did some experimenting, as you do :) . I found that if I run the outer two phases in parallel ( with one reverse polarity from memory, tbc) I could also parallel the
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desmond auld GI0UTE
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#39904
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Re: Building my first amplifier. Where to start?
Jeff, I have parked the idea of the triode and have ordered the tetrode boards from Dom, f1frv who has been very helpful. I am also finalising an order with Alex Ur4LL, for some gu43b tubes,
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desmond auld GI0UTE
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#39903
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Re: Gi46b on 2m - Thermal drift problem
Negatory. Being HFers, we can be forgiven, perhaps, for forgetting that at V/UHF, things are different... and there are such things as "transmission lines". This is a traditional stripline plate tank,
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Steve
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#39902
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Re: Gi46b on 2m - Thermal drift problem
Watch out.? You will introduce a ton of stray C on that hb teflon? plate block cap assy.....to the chassis below it. That amounts to a bunch more anode to chassis C. Knowing the spacing, and the
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Jim VE7RF
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#39901
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Re: Gi46b on 2m - Thermal drift problem
Insert a teflon sheet or other suitable insulator between 2 copper slabs, one of which is directly on the anode. Here is mine to give an idea. It's based on plans published by YU1AW. (Ignore the
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va3dxv
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#39900
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Re: Gi46b on 2m - Thermal drift problem
Yes, similar to a K2RIW amp.
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mike repinski
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#39899
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