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vintage ambulance radio pulse dial
- Thread starter jruta
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I saw stuff from this company, on other radio brands, back in the day. Are you certain the dial encoder was integrated, and not an external source?
www.com-spec.com
www.com-spec.com
Gotcha. I wasn’t sure if maybe it was something from say, western electric that they adopted for use. Thank you
If the encoder is an actual rotary encoder, Motorola might have procured them from a phone manufacturer, then used them to build the modules.
If you have a later version, where a keypad is the input, then the electronics output the PPS, that might have been all in-house.
Once again, both of those are if it is a Motorola branded accessory. After market accessories should show their brand, somewhere.
It seems that the M dial units (1500 hz interrupted tone) first appeared in the early 70s on the Micors, but may have been available on the Motrac/Motran series. I never saw any other brands shaped like Motorola's, GE used a different type, same function.
Great information. Thank you
Sounds familiar... But it has been a few years...
I’m going to look that up. Thank you
Going to look that up. Thank you much
Secode was another rotary dial signaling format. It used 2805Hz. It was often used by radio common carriers to alert subscribers. Secode made a nice mobile control head that had a telephone handset and could be connected to a variety of mobile transceivers.
Here is a picture of a Secode encoder next to a Reach encoder at an answering service 'back in the day'
Here is a picture of a Secode encoder next to a Reach encoder at an answering service 'back in the day'
"SECODE" is most likely what you're looking for. A lot of us old dinosaur techs are very familiar with those units on MotherMoto and GE installations. They were very reliable and gave us few if any problems unless they were subject to half-assed installation and/or lack of maintenance issues. The name comes from SEquential COding DEvice, or something close to that from the documentation I remember. Most were set up for one tone operation only, but they could be set up with an optional tone selector panel with 5 or 6 tones selectable one at a time for different encoding purposes.
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In the late 60's & early 70's there was a push to make it possible for the rescue squads to talk directly to the ERs rather than through dispatch.
The H.E.A.R. system was developed to meet that need.
Typically, there were one or more 'Med' repeaters installed in an area with wireline connections to remote units in the hospitals. Because there were often several hospitals in an area, it was necessary to implement a selective calling system so the ER staff didn't have to monitor the channel.
Hence, the encoders in the squads and decoders in the remote units at the hospitals.
Here is the Motorola rotary encoder for use with Motrac radios:
The H.E.A.R. system was developed to meet that need.
Typically, there were one or more 'Med' repeaters installed in an area with wireline connections to remote units in the hospitals. Because there were often several hospitals in an area, it was necessary to implement a selective calling system so the ER staff didn't have to monitor the channel.
Hence, the encoders in the squads and decoders in the remote units at the hospitals.
Here is the Motorola rotary encoder for use with Motrac radios:
wowologist
Certifiable
Rampart, Squad 51, sending you an EKG and standing by...
I used to maintain several hospitals and dispatch centers who has rotary dialers on T1605 remotes. As noted by xmo, the systems were designed to contact individual locations, while RF shared same freq/PL. (That way ER nurses didn't have to hear conversations with other hospitals) User had to know the site location "digital dial code". User would dial individual location and that was the only site/hospital that unmuted. (Digital Dial Decoder was typically in base station) Hospitals could "dial" other hospitals also. (IE The reason the dialers were installed on remote eq)
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