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[aprssig] 9600 baud TX equalization

Ray Wells vk2tv at exemail.com.au
Sat Dec 23 00:18:04 UTC 2006


Ian ZL1VFO wrote:

>>Message: 1
>>Date: Thu, 21 Dec 2006 10:22:41 -0800
>>From: "Scott Miller" <scott at opentrac.org>
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>>I was just reading over the original docs on the G3RUH modem yesterday, and
>>I noticed that it makes a big deal of transmit equalization.  Several
>>different waveforms were provided to compensate for frequency and phase
>>response in the transmitter.  In reading the manual for the KPC-9612+, I
>>only see an option for RX equalization.  What's the deal?  Are modern radios
>>consistent enough in their frequency and phase response to not require
>>adjustment on the TX side?
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>>Scott
>>N1VG
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>Most radios I'm aware of you have to connect deep inside to the
>modulator and demodulator circuits, so hopefully at that point the
>phase & frequency response shouldn't be too mangled, and should
>(hopefully) be reasonably consistant (allowing for levels, of course).
>
>Anyway, where did you find the docs on the G3RUH modem? - I wouldn't
>mind having a read of them sometime...
>
>73,
>Ian ZL1VFO
>
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Ian,

Take a look here, it may be what you're after.

http://www.jrmiller.demon.co.uk/products/figs/man9k6.pdf

Cheers
Ray vk2tv





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