[R-390] R390A- no sigs-4 to 8mc.

[David Wise]

(I presume you mean RF can not IF can.)
If you're on 0-1, the radio uses the 0-1 RF coils;
the 4-8 coils are out-of-circuit.  Same for all
bands except 4, 5, 6, 7, and 8.

If known-good 4-8 coils didn't help, you've eliminated
two suspects: the coils, and the socket contacts
they plug into.  Almost the only thing left that's
specific to 4-8 is the bandswitch itself.  It
may be oxidized; it may also be slightly misaligned.
If it's not that, there's nothing left but a
broken wire.  Everything else is used on at least
one band that works.

73,
Dave Wise


-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of wb3fau at att.net
Sent: Tuesday, February 03, 2009 4:51 PM
To: jmiller1706 at cfl.rr.com; Roger Gibboni; Barry
Cc: r-390 at mailman.qth.net
Subject: Re: [R-390] R390A- no sigs-4 to 8mc.

not meaning to be argumentive, but,  how do you  conclude there is a  bad IF  can if the radio works on higher and lower freqs OK?
   i did  change out the set of RF coils for the 4 to 8 mc range,  with  a set from  another receiver.  no help.
   I think  the band switch is the problem- S203-204-205, but not certain.


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