[BC] 25 watt 27.255 transmitter

[DHultsman5 at aol.com]

Jeff:

At one of the first Radio Stations I worked we used two Channel Motorola FM 
two-way radios on 26.25 mHz and  26.45 mHz.  We used two frequencies so when 
the skip was in we could maybe find one channel clear.   The radios were 
modified to use broadcast microphones and the radios were keyed on with a toggle 
switch on the control head.  The "IDC" audio circuits were mpdified in the three 
car units.  The base station receiver was modified to get the audio directly 
from the discriminator stage and the audio was fed into a line amp with a low 
frequency boost and a high frequency peak providing a fairly flat audio between 
100 and 4500 cps. at about 3% THD. Noise was  -45 dB.

These rules were then FCC Part 74 and allowed the use of AM or FM modes.  In 
the early days of crystal controlled CB radios many units were licensed on the 
RPU frequencies to allow small stations to put radios in most of the staff 
members cars for news, remotes and dispatching.

Don't recall the remote control rules.  Seems like George Marti played with 
both the Part 74,  26 mHz. broadcast channels for transmitter metering and he 
may have looked into the 27.255 mHz. frequencies for transmitter remote 
controls.

Dave Hultsman

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In a message dated 9/4/2008 6:52:11 PM Central Daylight Time, 
Xmitters at aol.com writes:

>  I cannot find in the rules where it has to be AM or FM. If FM is 
> allowed, then here may be some Motorola gear that's type accepted for this 
> frequency.
> 
> 
> Jeff Glass
>