Thanks for the replies.
UK wrote:
"have you used the shield/drain wire to ground the mic by trapping it under the mic plug cable grip at each end of the cable?,, have you tried removing the ferrite chokes, they can effectivly isolate the path for rf back to the radio and render youre grounding useless, good luck "
UK,
Yes I have the shield trapped under the cable grip at each end
and they are making good mechanical contact because I removed the ground wire that I had previously installed as mentioned in one of my posts above. The ferrite chokes slide along the outside insulation of the the cable. I realy don't want to have to take them off because that will require unsoldering and resoldering one of the ends.
I didn't think that they would interfere with the operation of the mike.
I had hoped that they would knock out any of the RF which I believe is causing my problem.
Doc wrote:
"The 'scratchiness' is usually a sign of a mechanical problem, something loose, the mic element, or a connection somewhere. Pad the mic element in the holder, which is a good idea anyway. Make sure all the 'screw-on' connections/conectors are friction tight. You don't need to use a pipe wrench on them, though. I've found that some 8-pin connectiors (the 4-pins too) are loose in the jack even when tightened, just have to live with that."
Doc,
The scratchiness in my audio only occurrs with the amp on and is not the result of any mechanical problem. Which is my major concern at this point.
Without the amp on audio reports are crystal clear.
I do not encounter this problem when using the amp with my HR 2600 with a Turner +3 desk mike.
Doc wrote:
"The problems with the 'MC' series of microphones dealt mainly with grounding/shielding. There was an article in the old "Ham Radio" magazine about a 'cure' for that, lots of bypass caps in the amplifier circuit and circuit board to chassis connections (that was a very long time ago, doubt if you could find it now?)."
Doc,
I did find a mod at the mods.dk site but didn't really quite understand it. See it here
Remove RFI in the MC60
If you don't mind look at this for me and see if you can explain better what this mod entails.
Doc wrote,
"Another 'quick'n'dirty' solution was to ground pin 8, depending on the radio used. Pin 8 is audio ground, and pin 9 is chassis ground (again, if I remember correctly). That isn't/wasn't such a good idea cuz' it made the radio chassis part of the 'audio' circuit, along with anything touching the radio. "
Doc,
The pin outs as described in my annotated 430S Manual are as follows:
1 MIC
2 STBY
3 DOWN
4 UP
5 +8v "annotation"
6 RX Aud "annotation"
7 GND MIC
8 GND Connection (STBY)
Perhaps this will help a little as to which of the GND's I need or don't need.
Sorry for the long post but I felt it necessary to help you guys understand what I am encountering. The bottom line is that I want use this Transceiver mic combination with my MF900 amp.
Again
for your help, it is always greatly appreciated.
73's
Wayne C.
CDX-787
mobile/base
Magna Force 900
HR2600/Kenwood TS-430S
MR. COILY Single Coil/Wolf .64 ground plane
D104M6B/MC-60 desk
Every man is a damn fool for at least 5 minutes every day; wisdom consists in not exceeding the limit.
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