Question about Radio Communications
The Rx audio circuit is working on TX. speakers mics are stopping the radio from transmitting and without the speaker mic , depress the ptt switch and tap on the case and the tapping noise comes out of the speaker . Several radiop are doing this , i changed the crystal filters and stil the same thing
Sounds like a faulty or dirty relay, could be mechanical relays or solid state
Posted on Mar 07, 2009
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Posted on Jan 02, 2017
SOURCE: cobra 29ltd classic : no rx / tx
D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)
Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Posted on Feb 04, 2008
SOURCE: tone squelch
Here is a link to download the user manual for the GP68 http://safemanuals.com/user-guide-instructions-owner-manual/MOTOROLA/GP68%20RADIO%20TRANSMITTER-_E
On your first radio, the one we've been discussing, I believe you have the DPL code set incorrectly. Your radio will go up to the number 126, but this is not the DPL code's number. It is simply a numbering system.
If I read the chart correctly:
DPL 205 equals the number 072.
DPL 023 equals the number 043.
Disclaimer: This numbering system listed in the user guide does not follow any common numbering system. I have other TPL/DPL charts which differ. The above reference is only based on what I have read in the user guide.
I am confident if your radio worked previously at another job site, using other frequencies/PL codes, that your only issue at this time is programming.
As for your unlock issue on the other GP68. Your radio may be in need of repair. The internal button is possibly wornout or has been depressed too far, and is bent on the board beyond the point of functioning.
Posted on Sep 29, 2008
Have you tired performing a general reset (see page 92 of your Operator's Manual). If you have tried this and still have had no luck, be sure that you have established a good ground to earth and that you are not getting a lot of RF back into your 920.
If you do not have a manual for your rig, one can be downloaded here http://www.download.n7tgb.net/yaesu/FT920/man_ft-920.pdf
You can also call Yaesu Tech Support for free/additional help at 714-827-7600, or join the Yahoo FT-920 User's Group at http://groups.yahoo.com/group/YaesuFT920/
Hope this helps......
Posted on Jun 26, 2009
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