[ARDF] Question about 2m frequencies for ARDF

[Kenneth E. Harker]

Matt,

    In Texas in 2008, we used 145.02 MHz for control transmitters and 
145.565 MHz for the homing beacon.  Vadim used the same pair in Boston 
in 2009.  The one thing to worry about with 145.020 MHz is if there's a 
strong packet station nearby on 145.010 MHz.

-Ken

On Mon, Nov 16, 2009 at 06:40:07PM -0800, Dale Hunt WB6BYU wrote:
> The official range used by Region 1 (Europe and Africa) is 144.5 to  
> 144.9 MHz,
> which is not particularly convenient to our repeater band plan.  (I  
> have, however,
> used a 2m repeater pair for a competition before, with permission of  
> the owner
> and/or after ensuring that it would not cause interference.)
> 
> While there may be some homemade receivers that only tune a restricted  
> range
> of frequencies for various reasons, you can generally expect receivers  
> to cover
> 144 - 146 MHz.  The 145.8 - 146 range is discouraged because it is  
> used for
> satellite operation.  As long as you publish the frequency in advance,  
> those
> with narrow-tuning receivers can adjust them accordingly.
> 
> The biggest issue is strong signals near the frequencies - the older  
> European
> Sets have a pretty wide IF bandwidth and will respond to signals several
> hundred kHz off frequency if they are strong.  Here in Oregon we have a
> number of packet radio links operating in the 145.5 - 145.8 MHz band  
> that
> sometimes cause problems.
> 
> 
> 	- Dale  	WB6BYU
> 
> 
> 
> 
> On 16 Nov 2009, at 14:51, Matthew Robbins wrote:
> 
> > I know there are some 2m receivers that don't receive in the upper  
> > part of
> > the 2m band.  What is a safe range for a transmitter frequency that  
> > would
> > include as many of these receivers as possible?  Is there any  
> > problem with
> > 145.565?
> >
> > Matthew
> > AA9YH
> > Cincinnati
> > _______________________________________________
> > ARDF mailing list
> > ARDF at kkn.net
> > http://www.kkn.net/mailman/listinfo/ardf
> 
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-- 
Kenneth E. Harker WM5R
kenharker at kenharker.com
http://www.kenharker.com/