[GreenKeys] Brecom System

[KFIam640@aol.com]

I am also interested in learning more about this.=A0 Two and a half years ag=
o I=20
retired from the position of Chief Engineer of KFI in Los Angeles, after=20
being at KFI from 1976 to 2000.=A0 I remember hearing of the FSK on KFI back=
 in=20
the fifties and tried to copy the signal but at the time I did not have an=20
FSK demodulator that would handle the narrow shift.=A0 Nor did I know when t=
he=20
tests were on the air.=A0 I don't believe the tests ran all the time.=A0 One=
 of=20
the old timers at KFI told me the shift was plus and minus five cycles.=A0 W=
hen=20
I arrived at KFI there was a model 19 at the transmitter which had been used=
=20
for this system.=A0 There were also some FSK modifications in the KFI=20
transmitter that was in the use at that time.=A0 I later replaced the=20
transmitter so the FSK modifications went away.=A0 I never did see the Model=
 19=20
wired to the transmitter.=A0 I always assumed it was a standard Model 19=20
Teletype machine that ran at 60 WPM, 45 baud five level Baudot code.=A0 I ne=
ver=20
took time to power up the machine to check the speed.=A0 In the eighties I=20
installed a solid state 50 kW transmitter at KFI.=A0 During the clean up of=20=
the=20
building the Model 19 was dumped.=A0 It happened without my knowledge.=A0 Ha=
d I=20
known I would not have let it go to the dump.
=A0=A0=A0=A0=A0=A0 I never did see any evidence of how an incoming signal wo=
uld be put on=20
the air.=A0 Based on what I saw it would appear that the Model 19 was used t=
o=20
run a test loop tape of some sort.=A0 I don't remember seeing any type of of=
f=20
air FSK demodulator for receiving an incoming signal.=A0 Though there was a=20
Hammarlund general coverage receiver at the KFI transmitter.=A0 I remember=20
someone telling me that the plan was to receive the signal from another=20
broadcast station for relay.=A0 I was under the impression that the=20
transmissions were to be received by military ships at sea in the Pacific=20
where KFI would have a good signal at night.
=A0=A0=A0=A0=A0=A0 I believe the tests on KFI continued into the fifties.=
=A0 I acquired my=20
Model 26 in 1955 and that was about the time I heard of the KFI tests on=20
FSK.=A0 I hope someone has more information on this interesting piece of=20
history.

Marvin Collins, W6OQI
retired Chief Engineer, KFI Los Angeles


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