Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Mike -
Sounds like a VCO problem. The primary difference between the two
"groups" of bands is that they rely on two different VCOs. If the
sythesizer isn't "locked" the transmitter will not operate. What does
the frequency readout show when the transmitter won't transmit?
You can do a rough check by pushing in the "Fixed Rcv" pushbutton. The
frequency display should count up in frequency and then sort of "dither"
around 17 MHz for bandswitch settings of 14 and down, and 32 MHz for 21
and up.
It sounds like the VCO's may be running around the "edge" of their
capture limit.
There are other possibilities as well, but this is a start!
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>
[EMAIL PROTECTED] wrote:
Hello Drake Guys,
I am new to the group. I have a problem I hope someone can help
with. My TR-7 (that I bought new) has an intermittent receive/transmit
problem. When I push the PTT on the sideband mode the TR-7 will not go
into transmit. If I try closing the key in CW mode again it will not
go from receive to transmit (the sidetone monitor does come on). The
relay does not close. This goes on for a while then the radio will
work for a number of weeks, then the problem happens again. The WEIRD
part is that if it stops working on 14, 7 or 3.8 mhz I can go to 21 or
28 mhz and it will work there. If I go back and forth, 14 mhz or
less will not work and 21mhz or higher will work. This has always been
the case. The TR-7 will then work fine for a few days or weeks then go
into this cycle again. I have tried different microphones including a
new one. Do you think it is the relay, if so why would it always work
on 21 mhz or higher. Any ideas would be greatly appreciated.
73 Mike WD5GLW
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