[Elecraft] Bias Resistor for microphone

Hello, a friend of mine gave me an old microphone from Philips (serial no. : C944685 ; part no. : 3513 505 00692) which I want to use with my K2 transceiver. The friend said that it should be an electret microphone, so it will need a bias voltage (he said 12V, but I found in the KSB2 manual that s

[Elecraft] Mini-RF chokes too big?! (KIO2 AUX I/O Module)

Yesterday I started to assembly the KIO2 AUX I/O Module. The problem is that the the (subminiature) chokes I've got are bigger than I think they should be, their body is as long as the distance between the pads so it's impossible to install them flat on the board. Are these the wrong chokes or is

Re: [Elecraft] K2 BFO Test fails

Today I ordered a new L33 and X3/X4, will write as soon as they arrived ... At this point: thank you Don for your indefatigable help! Benny -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5807300.html Sent from the [K2] mailing list archive at Nab

Re: [Elecraft] K2 BFO Test fails

Hi, grounding of L33 doesn't bring the expected signal (7.xMHz). D37 seems to be mounted the right way (round caps in direction to front panel). If I put a resistor parallel to R116(it should be the right one: grn-brw-grn-(gold)), i get the 4.9MHz oscillation, but still no signal at TP2 (in this

Re: [Elecraft] K2 BFO Test fails

So, hello again. First of all i want to excuse but I give you some false informations. The 8.x MHz signal I measured was/is at Pin 7, not Pin 6 of U11. I did the test with grounding L33/X3/X4 and there's some interesting behaviour (at Pin 7): When I ground L33/X3/X4, the measured signal is about

Re: [Elecraft] K2 BFO Test fails

I will do the tests tomorrow, but one question: A jumper from junction of l33,x3 and x4 to where? Benny -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5802044.html Sent from the [K2] mailing list archive at Nabble.com. __

Re: [Elecraft] K2 BFO Test fails

crystal values checked -> ok continuity of L33 checked -> ok D37 is correctly installed and I resoldered all pins of RP6 any other ideas? (how can I check if the crystals are ok?) -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5801952.html Sent

Re: [Elecraft] BFO Test fails

Q24: 5,76V L33(left): 8,33MHz(240mV peak-to-peak) L33(right): no signal (i think here is the lost) I have to admit that I don't have a call sign yet, but I'm already learning for the "exam" (I'm a student a had a lot to do the the last months..) Thanks for your help Benny -- View this messag

Re: [Elecraft] BFO Test fails

oh, i think i measured @ U11-P7 instead of P6. But when I measured again, there was a signal with ~8.1MHz and 1.5V peak-to-peak. U11-P7: no signal -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5801551.html Sent from the [K2] mailing list archi

Re: [Elecraft] BFO Test fails

very strange... i measured again and now there is a signal with 8,1MHz at U11-6 with 1,5V peak-to-peak... -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5801541.html Sent from the [K2] mailing list archive at Nabble.com. ___

Re: [Elecraft] BFO Test fails

Yes, its a K2 (sorry) The internal counter probe works, already tested in the earlier tests At U11 pin 6, I got a signal with 4.930kHz (2,4V peak to peak) Any idea? -- View this message in context: http://elecraft.365791.n2.nabble.com/BFO-Test-fails-tp584p5801501.html Sent from the [K2] mai

[Elecraft] BFO Test fails

Hello, my BFO test failed (it shows 0. Hz). After checking the right values of the parts, I made some measurements with an oscilloscope. Here the results: Between C174 and C173 : signal with a frequency of 8,06MHz (720mV peak). Results @ RP6: Pin2/Pin8 : no Signal Pin4: 8,37MHz (116mV peak) P