Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

 
 
LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #1   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 1,001
Default HT ceramic Mic

I don't do a lot of repair work these days how ever,
I have an HT the user/owner complains about low audio
on TX.
I don't have a real service manual but I do have the
original print that comes with the HT. This is a
Standard dual band, HeathKit also made one of the same thing.

Now, I can turn up the drive levels via pots that are
on the board for the VHF and UHF how ever, I don't see why
I should have to do this. Changing it from the original set
point to correct a failure somewhere isn't my cup of tea.

Since I don't have the real service print to go by, I don't
know exactly what is suppose to be at the varicap diode section
of the exciter oscillators for the UHF and VHF.

For an average level of audio into the mic of the HT, I'm
getting ~ 150..200 mv PP into the varicap diode section of the
oscillators..

To me, the audio level appears to be fine, the service
monitor appears to show it's spread is with in normal limits.

The only think I can think of is a bad ceramic element in the
2 wired condenser mic.

Do those things go bad by producing poor/low quality audio ?

I'm thinking this may be more of a clarity issue, than
anything else.

Thanks..
--

http://webpages.charter.net/jamie_5"

 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ceramic hob tvmo UK diy 2 July 31st 08 08:51 AM
Ceramic Hob Ed UK diy 5 October 26th 06 09:12 AM
Neff ceramic hob Luiz UK diy 2 September 13th 06 11:40 AM
'Halogen' in Ceramic Hob GPG UK diy 6 January 1st 06 04:20 PM
ceramic towel rack to ceramic wall dk Home Repair 8 December 11th 05 04:26 AM


All times are GMT +1. The time now is 06:22 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"