Could it be that there is a programming arrangement somewhere on the board that selects the offset? Maybe a resistor jumper somewhere that has been installed?
73, Clint, VE3CMQ
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[email protected]> On Behalf Of mike bryce via groups.io
Sent: Wednesday, 7 February 2024 09:41
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[email protected]Subject: [DRAKE-RADIO] Drake UV-3 transmit offset issue
Although I promised myself I¡¯d never work on one of these UV3s again¡ I can¡¯t say that anymore
The one I have on my bench has a weird problem with the transmit offset.
I set the dial to the local repeater, 147.18 and of course that¡¯s +600khz. However when you transmit, the offset is 1 mHz.
I¡¯m expecting to see 147.7800 on TX. Instead, I get 148.7800. Switching to -600kHz, I get the same result, 1 mHz lower than it should be
Simplex works as expected.
Simple things out of the way. YES! I did clean the contacts. Yes, I do have the service manual.
This problem is on the offset board. I have several boards and two work, and two don¡¯t. That also means the control head is working correctly (according to the drake manual)
Of course I checked all the diodes on the offset board, and there are quite a few¡
Frankly, I¡¯m baffled by this problem. The service manual doesn¡¯t go into too much detail on how the offset is generated.
Ideas anyone?
Mike wb8vge
