Many years ago I experienced a defective section of coax that would change
impedance when physically moved. Found out after slitting open about 12
inches of outer shield the dialectic was dried out and cracked from old age.
When
moved it would form air gaps between the center conductor and the inside of
the outer shield hence changing the impedance of the coax. The dielectric
looked like many thin insulated washers all stacked up on the center
conductor.
Bet something that would create some desense. I'd replace that coax from the
duplexer to the RX and inside the Rx to first stage.
Another problem was solved when it was discovered the center pin of a N
connector was recessed too much when the tech fabricated the cable, forming a
very small air gap capacitor between the male/female center conductor.
Gary K2UQ
In a message dated 9/3/2008 11:43:01 A.M. Eastern Daylight Time,
[EMAIL PROTECTED] writes:
First thing is to replace the suspect cable rather than trusting the
home-made shielding that was added. I also wonder if the transmitter is
going spurious. Was that checked and ruled out? I don't recall.
Chuck
WB2EDV
>
>> "John Transue" <[EMAIL PROTECTED]> wrote:
>> Well, I don't understand it, but yesterday afternoon the
>> repeater seemed to revert to a bad case of desense. Today
>> I will try to determine why this happened. Such is life!
>> JohnT
>>
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