Seems like RF getting back into the mike or mike circuit. Be sure the
Red & Blue wires in the UG8 cable to the radio are correctly wired to
the switch on the inside of the base, grip to talk bar switch, and the
Black & White & Shield which are the audio are correct to the mike
connector for the radio. Also try the radio on a dummy load. If it
works correct with the dummy load, then sure bet, it is an RFI issue.
That needs to be corrected.
If you are using a medium impedance {what ever that is} element, the
internal preamp in the UG8 base should not be needed. There's several
wiring diagrams on the internet, find one and wire the base
accordingly. Personally, unless one is using an original D-104
element, which requires a very high load impedance in the order of 3
megohms or more, then the "preamp" in the base is not needed and is
often more problematic than useful. If you are using the original
D-104 element, then the preamp is necessary in order for the mike
element to see a proper impedance and the preamp will drive a lower
impedance such as found in today's radios. But in other words "more
crap = more problems".
I find this site to have good information regarding the D-104 and the
UG8 stand and how to wire the "make before break switch" and the "break
before make switch". http://www.qsl.net/wa2mzf/d104.html
<http://www.qsl.net/wa2mzf/d104.html>
73
Bob, K4TAX
On 11/8/2015 10:13 PM, Reuben Popp wrote:
ast,
I also turned the D104 5K pot to a hair above its bottom extremity. Now
blowing or whistling or just plain talking into the mic will cause the K2
to cut out with a slight bzzt*pop* [from the radio] as the s-meter goes all
the way to the right and then goes dark. This happens every time.
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