Re: [amsat-bb] interference on 145.840 & 880

[Cliff Buttschardt <cbuttsch@xxxxxxxxxx>]

I think Mike has the probable solution to this type of ham
band QRM.  Just yesterday I had the squelch open up on a FM
mobile rig, but could not find the center frequency.  Then,
looking up at the nearby power pole was a box with an antenna
on it which appeared to be in the high end of the VHF band.
Cliff K7RR

Mike73@aol.com wrote:
> 
> In a message dated 1/9/01 3:33:47 PM Eastern Standard Time, albelo@caribe.net
> writes:
> 
> > I have two
> >  data signals in the amatuer sat freq bandplan that I cannot identify.  They
> >  appear on 145.840 and 145.880 Mhz.  The signals sound just like UO-11 to
> me,
> >  yet I know they are not that bird.  The signals are strongest when I get
> >  near a large shopping area with many restaurants. (Pagers maybe??)
> 
> Hi Mike,
> 
> I'll take a crack at it......
> 
> Recently I had a bursting data signal show up on 145.8575. It turned out to
> be my local power company. They recently started equipping their sub-stations
> with data links. This one turned out to be on 173.23750. My radio is a Yaesu
> FT-736R. It has a 2M IF of 13.69. Take 173.2375 - (2 x 13.69) = 145.8575 What
> gave away that it was an "out of band" signal is that when I switched in my
> mast mount preamp that has a helical filtered frontend, the signal
> disappeared.
> 
> Check the IF's on your radio, and do some quick math and tune around with a
> scanner and I bet you'll find it. Look for water tanks or electrical
> sub-stations with yagis on them.
> 
> Good Luck
> 
> 73,
> Mike, N1JEZ
> AMSAT #29649
> Local Area Coordinator
> "A closed mouth gathers no feet."
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