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RE: Anybody can Help me????


Hopefully this is what has been done. If it is deeper surgery, which it
sounded like it might be from his concerns about knifing the rig further,
then some further details might be in order for us to help him.


-----Original Message-----
From: Roy [mailto:rdwelch@swbell.net]
Sent: Wednesday, July 21, 2004 2:42 PM
To: rwmcgwier@comcast.net; AMSAT BBS
Subject: RE: Anybody can Help me????

Bob, if he is using the IFD board, he will not have widened the bandpass of
the radio
when used on normal 9k6 or FM voice operation.  The IFD board in just
inserted in the
1st IF circuit to "sniff off" a bit of the output of the first IF stage
while still
passing the same signal through a unity gain amplifier, on the IFD board, on
to the
normal xtal filter following the first IF stage.  The radio then can operate
as though it had never been modified.  The "sniffed off" signal is passed
through a
completely different wide band IF on the IFD board, detected, producing the
output audio to the 38k4 TNC.

73, Roy -- W0SL

Che cosa avete fatto deve allargare la larghezza di banda del Ts-790e per
concedere 38400 bps attraverso la radio.  Ciò è naturalmente, quattro volte
più largamente di quella necessaria per 9.6Kbps.  Così avete quattro volte
l'alimentazione che di rumore avete avuti prima che e la deviazione totale
del segnale 9.6Kbps come vista dal TNC ora sia 1/4 che cosa era prima.  Sono
impaurito che senza una disposizione di commutazione di un certo tipo,
avrete bisogno del a.lot del rapporto di segnale/disturbo per il 9.6kbps a
lavoro con i mods 38.4kbps.

Bob McGwier
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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