[Boatanchors] Re: [Drake] Drake TR-7 Xmit Question

[Al Parker]

Hi Bill,
    It sounds to me like there's a good possibility that you've got a poor 
connection on the display board.  Try, carefully, just pressing down on teh 
areas of the board that have connectors, seems like a good candidate has 
been the left rear corner.  if it's down tight, try lifting it a slight bit 
and re-pressing down.  You might jar things back OK.  Or, you might need to 
remove the board, and use De-Oxit on all pins.  Be very careful removing the 
board, do not move the several thumbwheel pots on the rt front area below 
the board, they set voltages, and must be very precise.  It's also possible 
that there's a cracked solder connection between a connector pin and the 
board.
    I'm sure someone with a much better memory, or more recent experience 
will tell you the functions of each area and each pot, but this is the 
basics, and I've been there several times.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: <w0ng at comcast.net>
To: <drake at mailman.qth.net>
Sent: Friday, November 23, 2007 1:03 PM
Subject: [Drake] Drake TR-7 Xmit Question


> I'd appreciate some help identifying the cause of an all-of-a-sudden 
> problem with my Drake TR-7 (serial 66xx). The rig was, up until this 
> morning, working fine...no issues.
>
> Now when I key the transmitter there is no measurable rf output 
> (regardless of mode selected or setting of carrier control) and the 
> digital display immediately counts upward to around 17+Mhz or 33Mhz 
> depending on what band is selected. Un key the xmtr and receive is still 
> fine.
>
> Front panel controls are set correctly. Using a dummy load instead of an 
> antenna made no difference. I also noticed the meter backlight flickering 
> when I try to insert a bit of carrier upon key-up. (???)
>
> Before I take it out of the case and start looking, does anyone have a 
> suggestion as to why it started doing this? I don't have a lot of digital 
> experience. Still stuck in an analog/tube world, hi. Thanks a lot. Bill, 
> w0ng
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