[AMRadio] Fwd: Re: Ebs Test failure

[Dennis Gilliam]

I remember we had a separate oscillator and buffer unit for the 1240
operation.  We had to patch it in after the original oscillator, and retune
everything for effect.  The transmitter was a 250 Watt Western Electric
451A1 on 1400, and we were lucky it was not a Doherty, as those were really
hard to QSY.  The other local station was on 560, and they did have an
extra little TX for 640.

73 Dennis W7TFO

On Thu, Nov 10, 2011 at 8:24 AM, Robert Nickels <ranickel at comcast.net>wrote:

> On 11/9/2011 11:18 PM, Dennis Gilliam wrote:
>
>> I can tell you, it was not easy to comply...shifting frequency to either
>> 640 or 1240, whichever was closer to your assigned freq...it was tough
>> getting 100 watts into the antenna when your 1kw station was designed for
>> 1400 Kc.  No VFO's in a radio station..
>>
>
> DG -  Thanks for your "been there done that" perspective.   I remember
> seeing a small transmtter in the back room of one station that was
> described as their "old Conelrad transmitter" from back in that era.  I
> remember it having some kind of matching coil on top, presumably to help
> match the non-resonant antenna.   Rather than fight the issues you
> describe, they'd  just switch over to this transmitter, which I was told
> was tuned to 640 or 1240 and ran low power.  (Wish now I'd said "Gee I'll
> haul that old thing out of here for you!)
>
> How common was this approach?   I started working as "the part-time kid"
> at a daytime station in the late 60s and well remember how the Conelrad
> receiver in the control room rack would false trip on lightning storms.
> More usefully, it would also trip when the key station we monitored
> switched patterns at sundown, which was a reminder that it was time to sign
> off if I'd nodded off during a particularly thrilling Mantovanni selection
> ;-)
>
> 73, Bob W9RAN
>