[amsat-bb] Re: VHF UHF Rig
glasbrenner at mindspring.com
Fri Jul 25 07:32:05 PDT 2008
The TS2000 generates an internal signal (a "birdie") on the downlink of
SO-50 and AO-27. This signal overwhelms the satellite signal in most cases,
making it difficult if no impossible to use on those two very popular
73, Drew KO4MA
----- Original Message -----
From: "Terry Dillard" <tdillard at gmail.com>
To: <AMSAT-BB at amsat.org>
Sent: Friday, July 25, 2008 9:55 AM
Subject: [amsat-bb] Re: VHF UHF Rig
> Pardon my ignorance, but what the heck is a "birdy problem"?
> Terry Dillard, KI4YZI
> "Veritas Vos Liberabit"
> On 7/24/08, Sebastian <w4as at bellsouth.net> wrote:
>> Oh boy, and here I just bought a used dual band mobile on the cheap
>> (no transmit) to take care of the birdy problem.
>> Do you have any idea why the birdy would show up on a different
>> radio? Could it be a matter of a lack of shielding? It just doesn't
>> make any sense to me why a different rig would get that interference
>> on receive, and even when using a different antenna.
>> Others have suggested using a preamp on 440, and turning off the
>> 2000's internal preamp and lowering the rf gain, therefore using the
>> preamp to get rid of most of the birdy.
>> But I guess I'll find out for sure when my other rig gets here.
>> 73 de W4AS
>> On Jul 24, 2008, at 7:00 PM, Bruce Robertson wrote:
>> > On Wed, Jul 23, 2008 at 11:31 PM, Mike Miller <mmiller at nctc.com>
>> > wrote:
>> >> Thinking about selling 847.....Which rig is best for
>> >> satellite..work.?
>> >> ICOM 910 H
>> >> Kenwood 2000
>> >> opinions ....your 2 cents
>> > I own a TS-2000. The birdie problem on SO-50 and AO-27 is quite real,
>> > and there is no fix I know of. I find that the birdie is so bad that
>> > even if I use a different receiver on UHF, I pick up the birdie on it
>> > as well! So it is a worse radio regarding satellite work than the ICOM
>> > if you care to work these birds. However, if you consider the fact
>> > that a fine HF radio is thrown in at no extra cost, that there is
>> > continuously adjustable filtering also at no cost, you might prefer
>> > that trade-off. I'm reasonably pleased with mine.
>> > However, if money were no issue, I would get the ICOM for satellite
>> > work and a different HF radio with even better characteristics.
>> > HTH,
>> > 73, Bruce
>> > VE9QRP
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