Hello, Firstly. I have a FM93 (10 channel) radio on 6m, working, well, was, has this strange quirk of not turning on when off, and when you manage to get...
Hi Mark, I can't see too many problems with taking the PA and RF boards from a 93 and putting them into a 92 body (or put the 92 control board and head into a...
Hi everyone Does anyone have a FM92 microphone he/she does not need anymore and would sell to me? Or is there someone in the region of Brisbane who could help...
Hi everyone Does anyone have a FM92 microphone he/she does not need anymore and would sell to me? Or is there someone in the region of Brisbane who could help...
Is It Tx'in, It may be VCO going out of lock on TX, can you confirm the its a audio fault?, could be bad VSWR on the Antenna?, is there a red dot near the...
... you might be really annoying and they are just ignoring you Jokes aside why do you say over modulation? if they can't hear you then there is no modulation ...
Hi Michael Thanks for your instant feedback. If I push the PTT to speak, all lights (green, yellow and red) and the channel number flash ... Not sure if this...
... Perhaps the problem is low voltage drop-out. What's the rating of the power supply you're using? Should be rated at 8 Amps or so. Gavin. -- Gavin Rogers...
Yes, sounds to me like low voltage problems. This will happen if you have thin or long battery wiring, or if the fuses are old or dirty. Also some people try...
Hi , We are TRYING to program some FM900's, but are haveing problems getting the eproms to burn. Just wondering what others are using and where we might be...
Most 2764 chips are fine & are reused many times. Rmember to burn with the right voltage as some are 12v & some are 24v. I find that the 2764 d variety fails...
We have tried a TOP2004 programer, an old sunshine with no luck. The Eproms are TI 2764-25, and the software tells me they are blank...even after programing!...
What are you using to erase the eproms ? are you leaving them in the eraser long enough. and if they are still coming up as blank you might not be using the ...
Hi this what I found, you must use a 12v 27c64 and you may need to put an external 12v psu on the programmer, like you do with the willem Steve ... From:...
I have used the TOP2004 but found it unreliable. I did subsequently modify it to take external power rather than relying on the USB power. I now use a TOP2048,...
A bit off topic but i know some of you are military radio collectors so here goes. Hi All you are invited to join the prc-320 user group, dedicated to the...
Sometimes with these older EPROMs it's better to use the 'generic' settings on the programmer rather than rely on the stored manufacturer/device settings. I...
Andre, Just had a scrounge through some data I downloaded years ago and found some specs for your TI TMS2764-25 ----750mW,250nS,Vcc 5v, Vpp 21v I have...
Thanks all for the suggestions. I have now had some success!! We are able to programe up EPROMS for UHF - 900's with tones!! It seems the problem is with the...
I was cleaning out my old caravan that was once used as a radio shack and found all the old FM 900 gear and thought why not. I have loads of FM900's laying...
The eproms are sturdy - they don't fail on their own. A blank read using 24v on a 12v chip don't kill them on my programmer. but can't say on yours. Make...
Marcel, Lots of zero's after erasing isn't a good sign - they should be FF's. Occasionally I've seen one or two bit's stuck low after erasing, (data like all...
Hi Marcel, I would be looking at the programmer as the first object of suspicion. It may not be working properly after a long time of no use. Make certain...
Hi Marcel Try erasing the eproms for a little bit longer as some very old eproms take a very long time to erase back to FF hex like someone mentioned before...
Thanks for the replies everybody. I have also come to the conclusion that something is not right with the programmer or software. I blanked out some known to...
Hi, Just to make sure we are talking the same thing here. The chips need to be in a uv eraser for 40 minutes. The windows on the chips need to be cleaned...
