President Grant no TX audio

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yazzo
Newbie
Newbie
Posts: 8
Joined: Monday 22nd Nov 2010, 3:17
First Name: yazz
Location: Finland

President Grant no TX audio

Postby yazzo » Saturday 19th Jul 2014, 10:44

Overall a working piece of device with no signs of "screwdriver tuning" but trouble in TX audio. In FM some audio can be heard if receiving radio is set to full volume. In AM/SSB no audio and some interference in the transmitted signal. Heat sink of IC6 and TR39 is abnormally hot. Where to start troubleshooting?

zodiac
Technical Helper
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Posts: 319
Joined: Sunday 7th Nov 2004, 13:58
Location: UK

Re: President Grant no TX audio

Postby zodiac » Friday 19th Dec 2014, 11:41

This may be a bit too late but IC6 the audio chip and TR39 do get hot.
What voltages are you getting on IC4 in TX and RX.
How far is it.
Twice it's length from halfway.

yazzo
Newbie
Newbie
Posts: 8
Joined: Monday 22nd Nov 2010, 3:17
First Name: yazz
Location: Finland

Re: President Grant no TX audio

Postby yazzo » Saturday 20th Dec 2014, 7:17

Problem solved, it was quite easy this time. A faulty mic catridge. Thanks anyway!


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