[Lowfer] Renewed Medfer Activity

Sat, 30 Aug 2003 15:58:42 -0400

Bill

there were some articles in QST using copper pipe loops for 160
and they worked well ,,  but wit the lessened BW. Not sure what the
antenna limits are for Pt 15 at this freq. Guess a loop would size the
same as for
pt 15 on 180 Kcs,,, I O W kinda like 50 Ft  or kinda like 10 Ft.

actually the 160 meter loop was pretty small recall abt 8/10 ft dia

HAR

Bob  K3DJC

On Sat, 30 Aug 2003 15:26:37 -0400 "Bill Ashlock" <[email protected]>
writes:
> >Using just the very top end of the AM broadcast band, from
> >say 1704.7 to 1704.9khz we should be able to operate dozens
> >of beacons in QRSS mode without interference to each other.
> 
> This tweeks my interest in Medfer sending from a TX loop standpoint. 
> A few 
> areas I just looked at (assuming a 3 meter square loop):
> 1. Still a "small loop"; IE: current distribution is equal 
> throughout
> 2. Radiation resistance up considerably from 185k
> 3. 2" copper pipe can be used without a trip to the bank, thus 
> reducing Rac 
> losses considerably from 185k values. This would easiliy make up for 
> the 
> reduced input power. This pipe diam. can be used without special 
> support 
> members.
> 4. Loop doesn't have to be mounted much higher than ground level and 
> can be 
> turned with a small low-cost rotator.
> 5 No problem outdoing Dex's Medfer antenna <G>
> 
> I'll do some looking at this area of the band tonight using QRSS20 
> and 
> report what I find.
> 
> Bill A
> 
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