[FoxHunt] SFL! DF 27 MHz.

[Mark Harrison]

Hi Kurt,

Some of the 27MHz remote control, alarm, and pager equipment uses
ferrite rod antennas in their receivers.  This may make it difficult
to identify the "remote" equipment.  Ferrite antennas are also used in
some compact low power portable transmitters as well.

Quarter wave whips are generally used for higher power base station
transmitters, which seems to be what you are hearing.

p.s. don't forget that as you approach a vertical antenna the field
strength may actually drop as you enter the null of the radiation
pattern off the end of the transmitting antenna (assuming it's up a
mast).  Triangulating with a directional antenna is usually most
fruitful than hunting on strength alone.

73,
Mark vk3byy



> -----Original Message-----
> From: KD7JYK [mailto:kd7jyk at earthlink.net] 
> Sent: Friday, 20 July 2007 4:30 PM
> To: Radio Direction Finding
> Subject: Re: [FoxHunt] SFL! DF 27 MHz.
> 
> > > Any ideas?
> >
> > Remote controlled sprinkler system?
> 
> I checked several sprinkler control areas, didn't see any 
> antennas.  All
> their equipment was made by Toro, will search google shortly. 
>  The city of
> Reno, NV, uses 154.600 to remotely control sprinklers 
> throughout the area,
> it is possible that someone is leasing space at the phone 
> company for a
> similar purpose.  The odd thing is that it repeats every 
> eight seconds.
> Seems to me you only need to TX when controlling something.
> 
> Kurt
> 
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