cdm1250 for repeater recieve

HLA · Post by **HLA** » Sun Jun 18, 2006 2:43 pm

ok i got a cdm1250 to replace a gm300, it recieves perfect but it won't send signal to the transmitter, i'm using pin 8 out but i think i saw somewhere that theese radios were digital out, does that mean i need a cdm1250 or 750 for the transmitter too?

ve3nsv · Post by **ve3nsv** » Sun Jun 18, 2006 5:39 pm

Did you program it for pin 8 out? The default I believe just has pin 3 ext ptt programmed and the rest set for null.

HLA · Post by **HLA** » Sun Jun 18, 2006 6:10 pm

yes, pin 8 is set to output

ve3nsv · Post by **ve3nsv** » Mon Jun 19, 2006 3:37 pm

Have you actually checked with a volt meter to see if it swings low with a valid signal? I have had no issues when using CDM-1250's with Rick repeater controllers and IP-223's. With a volt meter it shows 12.5v idle and .003 with a valid signal. Possibly you have a bad radio there, I have a M10 here that has no output on Pin 8 but has an active HI of 6.5v between pin 7 and 1.

HLA · Post by **HLA** » Mon Jun 19, 2006 4:22 pm

well it's a brand new radio just out of the box. email me with your email address and i'll send you the codeplug to look at.

HLA · Post by **HLA** » Fri Jun 23, 2006 9:39 pm

ok so i changed it around and am using the cdm1250 for transmit and it works fine. any other ideas?

ve3nsv · Post by **ve3nsv** » Sat Jun 24, 2006 6:09 am

Once again I would check with a volt meter between pin 8 & 7 and see if the CDM is being pulled low with a valid signal into the receiver.