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Re: South America QRM?



As long as anyone can buy 2m gear anywhere (like RadioShack) cheaper than
marine radios or business band, we're going to have this type of
interference. CTCSS tones on the satellites do not help really...If the
pirates 50 watt signal is there, along with your 5 watt tone encoded signal,
neither of you will be heard, and you'll just be scratching your head why?

Obviously there is little that can be done for the birds up there now, but
future satellite builders should realize this problem can be solved by using
mode B on LEOs. The pirates just are not there yet on 435, and the doppler
shifts them out of the uplink passband quickly, at least on FM. A few strong
downlinks on 2m like Dove and SO-35 were, might scare some guys out of our
subband at least.

73, Drew KO4MA

----- Original Message -----
From: "Nicolaus Sallay" <n.sallay@horizon.com.br>
To: <Santanaamt@aol.com>; <amsat-bb@AMSAT.Org>
Sent: Saturday, June 07, 2003 9:22 AM
Subject: Re: [amsat-bb] South America QRM?


> Hello Angel,
>
> -unfortunately we do have QRM from some kind of "comercial stations",
> I think so, on the uplink frequency of UO-14 coming from Central and South
> America.These stations naturally do not read us,otherwise they whoud have
> complained already.
> I do no know what can be done agaist this QRM, I think,several of these
countrys
> have a different VHF frequency allocations, or are pirate stations in the
middle of
> the jungle.We have been fiting locally several pirate stations and
gathered some
> sucsess,it's not a easy task.
>
> have a nice day
> Nicolaus K.S.Sallay-PP8DA
> n.sallay@horizon.com.br
>
> ----- Original Message -----
> From: <Santanaamt@aol.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Saturday, June 07, 2003 8:41 AM
> Subject: [amsat-bb] South America QRM?
>
>
> > Good morning:
> >
> >        Sometime ago someone was saying that when a satellite passed over
his
> > QTH, he heard some kind of conversation on the downlink; I have the same
> > situation over here. When the Uo-14 passes to the south I hear some
"telephone
> > conversations" that come from Venezuela or Colombia, very strong! But I
do believe
> > we don't bother them cause have not heard a complaint on their "phone
calls".
> > Have you heard them?
> >
> > Just curious,
> >
> > Angel Santana - WP3GW
> >
> > ----
> > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> > Not an AMSAT member? Join now to support the amateur satellite program!
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> >
>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org


----
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