[1000mp] HUM problem with MD-100 and Mk V Field

[1000mp@mailman.qth.net]

I did read this on the e.Ham.net Reviews:

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There is a problem with hum when this otherwise excellent microphone is used
with the FT-1000MP Mark-V Field. The shield from the MIC element head is
wired to pin 5 (PTT GND) instead of pin 7 which is the MIC GND. This wiring
mistake is in the microphone body, not the base or cable. This is not a
problem when used with the FT-1000MP Mark-V (200 watt version) nor another
radio such as the FT-847. A ground loop induced hum takes place when the
Field radio is used with its internal supply only. Yaesu is kept quiet on
this, and it may be OK on recent inventory. I recently had a warranty repair
of the radio returned to me with no problem found before realizing that the
problem was with the MD-100 as it was experienced with several MD-100 units.
Yaesu did tell me to reurn the microphones, but would not elaborate on the
fix. Just thought all of you should be aware.
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73, Hans Remeeus.
Ham Radio: PA1HR
www.remeeus.nl

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