[BC] Usefulness of EAS

[Milton Holladay]

I was just thinking what a peach of a job it was for WIS to switch their 
1948 WE 5kw (Doherty amplifier) from 560 to 640, but they did it somehow.
I wonder if there was any factory support  when  Conelrad began 
?....................
M

On 6/14/2012 21:48: , Ron Youvan wrote:
> RichardBJohnson at comcast.net wrote:
>
>> Do not believe Wikipedia. No station -- none, ever switched to 640 or 1240 kc/s for CONELRAD. In the days of kilocycles, there were no instant-tune transmitters. To bring up a transmitter such as a Western Electric 304-A on a new frequency required a group of engineers from Western Electric. The transmitter used custom-wound coils for each frequency and the output amplifier required precise 90-degree networks both at the input and the output to get the peak and carrier stages to operate properly. I know, I maintained one at WDEW. Even the Raytheon RA1000-A required multiple changes to switch frequency.

>>
>>     Wrong, WSUN 620 kc/s (5 kW) Saint Petersburg, FL (the first American DA, as WFLA) switched to 640
>> kc/s and WDAE 1250 kc/s (5 kW) Tampa, FL (Florida's oldest surviving station) switched to 1240 kc/s
>> for CONELRAD operation.
>>
>>

-- 
Milton R. Holladay Jr. / miltron at att.net
Columbia, S. C. / 803-331-8059
RF Measurements / Planning&  Installation / Emergency Service&  Parts