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The Koss cs100 has an electret element and works well. I have one that I have used. Someone else on this board put me on to it. They are now about $20, but not long ago were much cheaper.

Sorry that was for Q70

Q&0 pin 1 is 0.65v pin 2 - 0 volts pin 3 1.7 v Pin1 seems lower than the 1.3 expected in the diagnostic manual and pin 3 seems higher which was supposed to be 0.2v

just desoldered L5&7 to get ready for the placement of the SMD inductors.? From the image I can see where to solder the inductors to where the toroids were but can’t see where to solder the other

Also FYI just checking maybe not such a great deal on my scope the signal generator definitely has some differences compared to volt amplitude. I checked at 60hz AC volts with my multimeter and when I

Evan: Maybe...maybe not. My ?BITX is legal on 80M and 40M, and spot on for 20M, so I can use it on two bands and be within spec. Right now, 20M is out. Jack, W8TEE

I didn't hear a tone at 19.15, adjusting the signal generator up? to 19.26? I got that barely perceivable tone at 3.5v on tp17 and a much louder tone with 3.5v in on tp16.

Redid TP17 at 19.26 MHZ (should have been 19.15 (12MHZ+7.15) put in 3.5v to get 80mv p-p out but even though it showed 80mv I could barely hear a tone through it. This may be a hint TP16 at the same

One thing at a time ...one stage at a time ..Lets get the audio stage working first then ... Jim

Jim, all you mention is good for this problem and then I thought of something else: What if it's not just one thing on that list but a couple of them at the same time? In this case, it's not so much

Bit of an excessive loss across what should be an amplifier .. voltage readings on Q 70 ..Continuity (dc) through relay k3 (contacts 12/14) ...resistance to ground at TP21 ? Jim

Thank you!!

45 mhz section at TP13, TP14 ...12 mhz at TP16 and TP17 .. Just shows that workarounds to limited freq range is possible ..Really don't know the level of the harmonics, but at least something is there

RE: "My guess is there is a cold solder joint or some toroid has a broken wire somewhere between L1,2,3,4 and/or T2. And with cables lying about to inject 7mhz into TP2, some of that 7mhz gets coupled

The ones for telephones are condenser type. The last one for PC I had was also condenser mic. Raj

Nice contact Michael, I had not thought about the ocean behind you would make a difference. Yes to others up to about this spring there was a weekly bitx net on 7277. I have worked many stations on my

I'm in the US in Northern California near the Pacific. I had the privilege of making a contact with D4C using my uBITX v3 on 15 meters on a day where there was a DX Contest. They have emailed me a

Hi Evan, I notice the frequency mentioned in the header is usually used for SSB. I am using my uBitx with external filtering on 80 through 17 meters and not at full bore either. I will eventually

Hi, My V3 isn't broken:) I have been using it. I don't want to make the QSX into something different than it already is (or will be). In fact, I am not interested in mods to my uBitx beyond taming the

I was till I noted that my uBitx is not legal, so until I get the parts and install I am off the air. 73 Evan AC9TU