Specs on era 1960 mobile transmitters
 

I am looking for specifications of the following units:

Motorola Model FMT-41
Motorola Model T-31BAT
Motorola Model U-41GGT
Motorola Model T-41GGT
General Electric Model MT-13-N.

My particular interest lies with their modulation mode.
Any leads would be appreciated.

See: http://jfkassassination.net/russ/jfk...fk8/sound1.htm

Near the bottom of the report, explains what the author found.
Most likely they were "narrow" 5 kHz FM or could have been
15 kHz FM modulation, many two way radio systems were converting
to "narrow" 5 kHz scheme about then from 15 kHz "wide band", so the
FCC could allocate more channels in the same "band".

JJJHS


Herbert Blenner wrote:
I am looking for specifications of the following units:

Motorola Model FMT-41
Motorola Model T-31BAT
Motorola Model U-41GGT
Motorola Model T-41GGT
General Electric Model MT-13-N.

My particular interest lies with their modulation mode.
Any leads would be appreciated.

See: http://jfkassassination.net/russ/jfk...fk8/sound1.htm

Near the bottom of the report, explains what the author found.
Most likely they were "narrow" 5 kHz FM or could have been
15 kHz FM modulation, many two way radio systems were converting
to "narrow" 5 kHz scheme about then from 15 kHz "wide band", so the
FCC could allocate more channels in the same "band".

JJJHS


Herbert Blenner wrote:
I am looking for specifications of the following units:

Motorola Model FMT-41
Motorola Model T-31BAT
Motorola Model U-41GGT
Motorola Model T-41GGT
General Electric Model MT-13-N.

My particular interest lies with their modulation mode.
Any leads would be appreciated.

Subject: Specs on era 1960 mobile transmitters
From: JonJacobJingleHimerSchmidt
Date: 10/22/03 4:50 PM Eastern Daylight Time
Message-id:

See: http://jfkassassination.net/russ/jfk...fk8/sound1.htm

Near the bottom of the report, explains what the author found.
Most likely they were "narrow" 5 kHz FM or could have been
15 kHz FM modulation, many two way radio systems were converting
to "narrow" 5 kHz scheme about then from 15 kHz "wide band", so the
FCC could allocate more channels in the same "band".

JJJHS


Thanks for the information. Deviation, whether 30, 15 or 5 khz, is not a issue
since heterodynes produced by a modulated station with an unmodulated carrier
would indicate what deviation they used. My concern lies with the report of
IBM and others that provides convincing evidence of reception by a AM receiver.
For details see:
http://www.members.aol.com/hdblenner/anotherlook.htm

You can find the complete IBM document at
http://www.jfk-online.com/acousibm04.html

Thanks again.

Herbert


Herbert Blenner wrote:
I am looking for specifications of the following units:

Motorola Model FMT-41
Motorola Model T-31BAT
Motorola Model U-41GGT
Motorola Model T-41GGT
General Electric Model MT-13-N.

My particular interest lies with their modulation mode.
Any leads would be appreciated.

Subject: Specs on era 1960 mobile transmitters
From: JonJacobJingleHimerSchmidt
Date: 10/22/03 4:50 PM Eastern Daylight Time
Message-id:

See: http://jfkassassination.net/russ/jfk...fk8/sound1.htm

Near the bottom of the report, explains what the author found.
Most likely they were "narrow" 5 kHz FM or could have been
15 kHz FM modulation, many two way radio systems were converting
to "narrow" 5 kHz scheme about then from 15 kHz "wide band", so the
FCC could allocate more channels in the same "band".

JJJHS


Thanks for the information. Deviation, whether 30, 15 or 5 khz, is not a issue
since heterodynes produced by a modulated station with an unmodulated carrier
would indicate what deviation they used. My concern lies with the report of
IBM and others that provides convincing evidence of reception by a AM receiver.
For details see:
http://www.members.aol.com/hdblenner/anotherlook.htm

You can find the complete IBM document at
http://www.jfk-online.com/acousibm04.html

Thanks again.

Herbert


Herbert Blenner wrote:
I am looking for specifications of the following units:

Motorola Model FMT-41
Motorola Model T-31BAT
Motorola Model U-41GGT
Motorola Model T-41GGT
General Electric Model MT-13-N.

My particular interest lies with their modulation mode.
Any leads would be appreciated.