Take a look at this simple design by VU2ESE for the BITX40: http://bitxhacks.blogspot.nl/2016/11/agc-for-bitx.html?m=1 Still waiting for my 2 QCX kits so no idea if AGC is really necessary. Frank

Hi John, The opto coupler,if it uses a LED and photo-diode/transistor, may not work as required. I have designed/used many circuits with cds LDRs. They work, because the resistance change is

Hi Patrick, I run 3 18650 lithium cells in series. The cells are wired to a controller built into the battery stack. This is used purely to shut down the stack if any cell voltage drops below

Bob, I meant a commercial 10MHz OCXO, the QRP Labs one might be able to be setup as good but I am thinking of probably a around $30 with the advantage of no GPS. (If you think that is an

Hi Bob, Like some of the others posting here, I'm disappointed in the ProgRock and QLG1 GPS as a 10 MHz reference. I'm using the recommended Fox TCXO which is just excellent. And for cheap. But

Hi Phil. Mine works ok on 40m. I am 400mtrs from you. Vin G4ksy

Hi Bob and all, I’m following this thread closely because I have built a 10Mhz Reference from a Progrock and a UBox M-6 module. It works, but is not as accurate as thought it would be. I think it

Hi Guys, im back again. I get continunity between pins 1,5,16 and ground. With the power on (12v) and the contrast pot set for 0.57v on pin 3 i get the following.. Pin 1 0v, 2- 4.87v 3- 0.57v ( with

With every major release you had to re-learn Windows as they keep making major changes on how Windows works, I'm speaking of Win2K, Xp, Windows 7, and Windows 10 not the in-between updates. Linux on

Ok, Thanks guys. So if I understand it, using the OCXO/Si5351A with the Progrock instead of the standard non-OCXO 5351A version would be an improvement? That makes sense. All of the GPS discipline

I have a big bunch of PCs, and I given up on updating all the PCs, I use to update them all every time there were updates but no more. I update them only as needed since most are not in use and turned

Ben and all, It sounds like you and I are similarly afflicted! My eyes are not very good either, one having macular degeneration to the point that everything is a blur with that eye. Thus my

Bob, I suspect you could do better with a good modern OCXO. (Mine stays within about 0.1Hz at 10MHz over a year checked with GPS.) But I await John's tests with interest. 73 Alan G4ZFQ

I don't want Hajo Yes, I'll let you know what I want. But I suspect there is not an easy answer. 73 Alan G4ZFQ

YES Bob - when it is all functional. John - VK6JY I will check it against my two rubidium standards when all is ready. I'll add some buffering. On

I just read through the ProgRock manual and it looks like using the OCXO oscillator with the ProgRock and the GPS will get you close, but it doesn't look like it will be real "Lab Grade" but will be

Hi Hans, I never realised that. I tried it and it worked as you said. Many thanks for the explanation. 73 Ken G4APB

I have several pieces of test equipment that have an input for a precision 10 MHz reference. Specifically an HP freq counter. Would a Progrock and QLG1 GPS set 10 MHz provide a lab grade reference for

Hi Klaus, I would have thought Chicago cemetery would have been busy even at midnight?! What you have sounds a bit like what I had at first, and I found I had wound my T1 in the opposite direction so

Ben nice to meet you and so many other great folks here, and Hans is amazing. Your idea of the T1 method is a very nice one. I made my leads not 3cm but much longer, so as to be able to pull it high