QRZ Forums - Radio Circuits, Repair & Performance for Monday 27 March 2017
 

Radio Circuits, Repair & Performance

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Ten Tec 1210 transverter

Posted: 27 Mar 2017 08:05 AM PDT
http://forums.qrz.com/index.php?thre...verter.560672/

Can anyone help? Looking for component layout, need to identify rf amp,
any info welcome.



Dave G4PGQ

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diode question: okay to Replace a 1n4005 with a 1n4007?

Posted: 27 Mar 2017 04:04 AM PDT
http://forums.qrz.com/index.php?thre...1n4007.560622/

Hi all, Ive been working on an old Heathkit SB100 that I am attempting to
return to service(not to be pretty, just to be pretty functional).Got
almost all of the kinks worked out(there werent that many.. just a few bad
resistors), and still dont have any ALC indication on transmit. On the RF
Modulator board there are a couple of 1n4005(500V, 750MA) diodes(Heath
part#57-27) that are in the ALC circuit that I am going to probably pull
and test(can I test without discharging the caps or...



diode question: okay to Replace a 1n4005 with a 1n4007?

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Kenwood TS-570D transmit/tune problem

Posted: 26 Mar 2017 04:40 PM PDT
http://forums.qrz.com/index.php?thre...roblem.557822/

Hi.



The radio club at my local MakerSpace has a donated TS-570D. It was
working fine when we first started using it.



Last fall, it would sometimes "lose its tune" (SWR would suddenly jump) in
mid-transmit, and in one case the unit spontaneously powered down. In
fact, that was the last time it was used, around last November or so.



We recently moved the entire rig, and I am in the process of getting the
new system and antenna up and running. Here is a description of the
current...



Kenwood TS-570D transmit/tune problem