[FARC] Fwd: 147.06

Thu Jan 13 06:02:30 EST 2011

Santford,

I read the initial email & really didn't have anything to add. Except no one has touched the possibility of him using a different antenna to test his problem.

As I said during our commute this morning on the 147.060 machine, the probability that the problem was the repeater was slim to none. Others here have already brought up one of my points, that being his rig was at fault. So I don't need to go into that one except to say that it could be a wide open front end, as mentioned, or it could be that a mixing product is not being filtered properly.

The second point I made was that the problem might, in some way, be associated with the antenna. A simple test would be to bring another rig in, that does not show the problem at its normal location, to this location & see if it too now has a problem on this antenna.

Those two tests (different antenna, different rig) will pinpoint the problem to the rig or antenna.

Last point, has anything been changed recently? If so, there's you problem. In my experience repairing all sorts of things from cars, radios, TVs, and even software, or perhaps especially software, the last change, modification, enhancement, made before a problem is noticed is 99.99% sure to be the cause of the problem.

73 de ke3fl
Phil

&#65279;---------- Original Message ----------
From: James Williams <kb3kva at gmail.com>
To: Phil Karras <ke3fl at juno.com>
Subject: Fwd: [FARC] 147.06
Date: Wed, 12 Jan 2011 22:20:06 -0500

Phil..Not sure if you have been following this dialogue or not..Anyway FYI..Santford

---------- Forwarded message ----------
From: Dan Blasberg <Blasberg at verizon.net>
Date: Wed, Jan 12, 2011 at 18:39
Subject: Re: [FARC] 147.06
To: "Frederick, Maryland ARC" <farc at mailman.qth.net>

Kirk,

We are also on 145.75 for Airmail down here, we picked up the 146.610,
146.880 and 147.105 machines on .75 until we moved to commercial
radios and added filters.

Dan
KA8YPY

On Jan 12, 2011, at 6:31 PM, Kirk Talbott wrote:

> I believe the problem is fixed here although
> with compromises on my part.  I changed
> antennas to one 20 ft. lower, and
> set the radio to narrow FM.   I'll monitor
> it a little while longer though.
>
> Now the guys up in Cumberland have
> an EOC that uses Packet and
> they use it on 145.75.  If linked repeaters
> in Berkeley Springs WV and Damascus MD
> are getting into me, I'm wondering if Berkeley Springs
> or other linked repeaters up there are getting into
> Cumberland with the same thing?
>
> -----Original Message-----
> From: Dan Blasberg
> Sent: Wednesday, January 12, 2011 5:57 PM
> To: Frederick, Maryland ARC
> Cc: lester at veenstras.com
> Subject: Re: [FARC] 147.06
>
> 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&#65533;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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