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I know I have RFI problems in the house, between the WiFi and the CFL lamps. So much so, that I can only reliably receive two or three of the local AM broadcast stations in the house whereas if I take

It's quite common for noise sources in the house to go up the coax and come back in from the antenna. Could be you need a good "common mode choke".

More Hacking of the Bitx40 http://n6qw.blogspot.hr/2017/01/more-hacking-of-bitx40.html#gpluscomments http://n6qw.blogspot.hr/2017/01/more-hacking-of-bitx40.html#gpluscomments More Hacking of

If your using the QRPlabs VFO for the BitX40, then the LPF you bought for 40 meters is optimized for 7-7.5MHz. You need a LPF for the actual VFO output which is 4.5-5MHz. The 7MHz one is probably

'Repair & Reuse or Recycle E-Waste' http://2.bp.blogspot.com/-Ceasc1Ws1gY/VpPCFy1u43I/AAAAAAAAEzE/xYCFQegf0K8/s1600/forty2.jpg Most of times only 1 transistor burns out from complimentary matched

in this funny video ;) you can see also vu2ese Farhan small amplifier for bitx ;) ;) 9a3xz,Mikele 9a3xz - n6qw bilateral amp. and vu2ese amplifier 25w

'Repair & Reuse or Recycle

It is my understanding that rechargeable Li-ion , LiFePO4 cells having an nominal voltage of 3.7 V should NOT be discharged below 3.0V Commercial charging modules charge the cells up to 4.2 V Frank ,

C103 & C102 are in parallel. I (and a friend) found it worthwhile to experiment with C102's value. Dropping it to 27pF produced punchier audio for us as there was a better representation of audio

What is the voltage at the base of the IRF510? It should be about 1-2v. Anything above 5v or so will blow it up. These devices are very touchy. Do you have a signal at the collector of the 2N2219A,

Looks even better after seeing it on FB, Pop. Just makes me ewant one even more:). Nice gesture giving one to Ashhar too. Congratulations 73 Bill, VK7MX

When I bought the VFO kit from Qrp-Labs, I also bought a 40 meter low pass filter kit. I installed it in line with the output of the VFO. Pretty simple, The receiver seems quiet, at least as quiet as

Thanks Pop. I'll ask the xyl to bring up your FB pages for me to look at, as I don't use FB myself. 73 Bill, VK7MX

Hi Bill Yea I made a few and many wanted them so made some more You can see my FB page for more pictures Tnx 73 Pop VU2POP Sent: Thursday, January 05, 2017 12:47 PM To:

Good, you have a scope. I'd find some noisemaker like a code practice oscillator with a brick on the key, put that in front of the mike. Put a 50 ohm dummy load on the antenna connector. Then hit

The gate at q15 should be somewhere between 0 and 5v, as set by the pot at RV1. And the drain should be around 12v with no signal present. You can look at those without pressing ptt. Well, the

Yes Q13 has those voltages. I put a scope probe on that pot and saw a 7 mhz signal I'll look tomorrow at the pot number.

So you have 3.7v at the base of q13 when you push ptt? Is the emitter of q13 at about 3v? If so, then q13 is probably working. When you say you "see a signal passed q13", exactly what are you looking

Well replacing q13 seamed to work for a little bit. Once again no output power. I can see a signal passed q13 now. And I have 3.7 volts on q13

Tony, thanks for the update. Looks like I've got a couple of weeks to go! :-)) Roy WA0YMH wrote: