[BC] Early mobile phones

[Gary Glaenzer]

and then came IMTS

base transmitted 'marked idle' of 2000 Hz, mobiles scanned till they found MI then stayed
with it until signal faded or they detected a difference between an outpulsed number
(bursts of 2 k and 1800 Hz) at which point they scanned for another MI

numbers were area code + 4 digits, which theoretically gave 10,000 numbers per area code,
but as I recall, there were some restrictions on mobile #'s, again from memory...no
leading 0, no repeats of more than 2 digits, and a couple others

the old Motorola TLD-1100's were bullet-proof, with discreet transistor decoders and
tube-type driver and final;  the later 'Pulsar's were more compact (and a virtually
trouble-proof TX/RX built around Mocom-70 tech) but not as forgiving of such things as
jumper cable screw-ups under the hood

the old units used separate Channel Elements (tx and rx in one package), the Pulsar was
the first commercial unit to use 'divide-by' technology to set the L.O. frequency to
sequentially scan channels

11 channels on VHF and 13 on UHF, oh, man, we were in Batwing Nirvana !




----- Original Message ----- 
From: "Harold Hallikainen" <harold at hallikainen.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Monday, January 07, 2008 10:28 AM
Subject: [BC] Early mobile phones


> I used to have a Radio Common Carrier radio in my VW van for use at
> transmitter sites with no phone. It was a GE something or another with
> tube finals. My "phone number" was
>
> 248-0663
>
> where, as I recall, 248 identified the carrier and 0663 was the unit number.
>
> Long time ago!
>
> Harold
>
>
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