[FARC] 147.06

[Dan Blasberg]

If I may interject from down here in PG County.

We have the same issue with intermod and mixing at our EOC, we would  
hear several amateur repeaters on several frequencies across the band,  
but the problem was not with the repeaters or their transmitters.  The  
issue was the open front end (i.e. receives DC to Daylight) on the  
amateur band radios used as well as a local taxi transmitter over  
driving the front end and the mixing byproduct of the taxi transmitter  
keying up at the same time other amateur repeaters were in use cause  
the amateur repeaters to come across on other frequencies.

When we approached the taxi company, they had their technician contact  
us and he checked their system.  It was well with-in spec and had no  
spurs anywhere.  So the fix for our issue was two pronged.  Approach  
one, was to use commercial grade (motorola, kenwood and icom) radios  
programmed to the amateur VHF frequencies we had programmed for  
permanent use.  Approach number two was to put a filter on the amateur  
band radios used by VFO on VHF.  Both of these took care of our issues  
down here.

May be the same issue up there, may not....just some food for thought.

Dan
KA8YPY

On Jan 12, 2011, at 5:40 PM, Kirk Talbott wrote:

> So I'm to suffer from a poor location as a linked repeater empire
> grows unchecked occupying an entire segment of the band,
> and whose technical omnipotence is unassailable from mere
> "underlings?"   Is a ham radio repeater system a public service
> or a private domain?  Suffer yes, in silence, never.
>
> "...the citizen who thinks he sees that the commonwealth's
> political clothes are worn out, and yet holds his peace and
> does not agitate for a new suit, is disloyal; he is a traitor."
>
>       ...Twain.
>
> -----Original Message-----
> From: Lester Veenstra
> Sent: Tuesday, January 11, 2011 3:38 PM
> To: 'Frederick, Maryland ARC'
> Subject: Re: [FARC] 147.06
>
> The fact that a receiver (particularly on Braddock Mountain) is " am  
> being
> hammered by intermod" should come to a surprise to no one.  However  
> the fact
> that this is happening and you wish to " want to pass that along"  
> implies
> that some else, i.e. the repeater operator" is at fault and should  
> correct
> the receivers' problem, is a false assumption about the cause if
> intermodulation products in an RF dense environment.
>
> "The fault, dear Brutus, is not in our stars,
> But in ourselves, that we are underlings
>
>
> Lester B Veenstra  MØYCM K1YCM
> lester at veenstras.com
> m0ycm at veenstras.com
> k1ycm at veenstras.com
>
>
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> -----Original Message-----
> From: farc-bounces at mailman.qth.net [mailto:farc-bounces at mailman.qth.net 
> ] On
> Behalf Of Jeff Fishman
> Sent: Tuesday, January 11, 2011 1:03 AM
> To: Frederick, Maryland ARC
> Subject: Re: [FARC] 147.06
>
> Kirk,
> Thanks - will pass this along to N3VNG.
> Jeff
> ----- Original Message -----
> From: "Kirk Talbott" <kirktal7237 at msn.com>
> To: "Frederick, Maryland ARC" <farc at mailman.qth.net>
> Sent: Monday, January 10, 2011 7:50 PM
> Subject: [FARC] 147.06
>
>
>> FYI, I�m listening on the Frederick County Packet
>> frequency 145.75 and am being hammered by
>> intermod with voices from the 147.06 Monday
>> evening ARES net.  My location is Braddock.
>>
>> Additionally, I can hear the 147.06 ARES
>> net loud and clear down on 146.735 also.  Might
>> want to pass that along.
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