Batboard

Gents,

I managed to find a tape of our fire department dispatch center circa 1980 and created a wav file that can be found here as a zip file:

http://www.thewatchdesk.com/forum/attac ... ntid=23036

What I'm puzzled with is the pronounced "hum" sound that is heard in between the paging tones. I recall hearing this hum during those days and always wondered what could be causing it on their radio system. At the time they used a Motorola Centracom console (model with the red green and white buttons for selecting transmitter sites and PTT) and Quik Call for paging. The dispatchers wore Starset headsets and the PL was 5A or 156.7 hertz.


Thanks,
Tim - N3EKG
Silver Spring, Maryland

Sounds like the Console compressor gain goes way up picking up any hum arround. Like a ground loop from the encoder, ect;.

60hz hummmmmmm!

Wow... That's freakin awesome... CLASSIC!

That's definitely 60Hz hum. I agree with will - the gain on the recodrding device picks up bigtime during the periods of silence... Almost like an AGC type thing.

Plectron tones too! NEAT!

Are there any standalone plectron encoders that do the dual-tone (not Quik-Call, I mean the dual-tone dual-tone) Plectron paging these days? I'd love to get one...

FWIW there is still one department I am aware of in the next county that uses the "chord tone" style tone and I think there might be another as well but it doesn't get sent very frequently. CDF has a few of them left too but they converted all their local stations and crew buggies to DTMF recently

Birken