[Milsurplus] AN/GRC-27

Sun, 07 Sep 2003 12:17:33 -0700

on 2m running 50 W and 36 foot Yagi have worked Hawaii from Nipomo, CA

D C Macdonald wrote:

> Not very likely "ground wave" but tropospheric ducting along the virtual
> waveguide frequently produced along the boundaries of a temperature
> inversion, i.e., warmer air above colder air.  Ham stations around S.F.
> and L.A. California have worked into Hawaii on transmit power of 1 kW
> with antenna gains of 10 - 20 dB.
>
> Mac
>
>
>
> ----Original Message Follows----
> From: Bob Wilder <[email protected]>
> To: [email protected]
> Subject: [Milsurplus] AN/GRC-27
> Date: Sun, 07 Sep 2003 14:05:44 -0500
>
> An interesting story about the Jerk 27 thought the list might like.  
> While stationed at the
> Fortuna AF  Station GATR site we used to use a GRC-27 to drive the 
> spare channel of the
> FRT-49 data link transmitter.  As the FRT-49 runs about 22KW it sure 
> would overcome most
> of the ECM used by SAC on exercises.  Everything was all OK until the 
> Navy started to
> complain that we were wiping out the bombing range communications off 
> the Washington State
> coast.  We never realized that UHF would carry about 1200 mile ground 
> wave. But think
> about it, 22KW at 290Mc into a high gain slot antenna and an ERP close 
> to a megawatt.
>
> Bob Wilder
> 6032 Idlemoore Court
> Theodore, AL 36582-4117
> 251-653-5274
> http://home.earthlink.net/~bwild
> Asst USAF State MARS Director- Alabama
> AF2HD/AFA2HD
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