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[aprssig] Modem tones, the KPC3+, and Bell 202

Earl Needham earl.kd5xb at gmail.com
Wed Aug 11 15:32:47 UTC 2010


They're NOT right, the 10 Hz difference makes it difficult to copy weak signals. I've seen it repeatedly "out in the sticks". 

Earl
KD5XB


------Original Message------
From: Phil N6TCT
Sender: aprssig-bounces at tapr.org
To: TAPR APRS Mailing List
ReplyTo: TAPR APRS Mailing List
Subject: Re: [aprssig] Modem tones, the KPC3+, and Bell 202
Sent: Aug 11, 2010 09:03

Bob Bruninga wrote:
>> KPC3+ ... was 1300 and 2100 Hz.
>> is a V.23 modem, not a Bell 202 modem.
>> "Why... would anyone build in a 100 Hz'error'
> 
> My recollection is that when they redesigned the KPC-3+ hardware there were no 202 chip modems availalbe anywhere.
> The only chip on the market was V.23.

Bob wins the prize: just got off the phone with Kantronics and they
confirmed his recollection.  They say the 100 Hz delta makes no
difference.  Let's hope they're right.

Thanks to all who responded.  We now return you to our regularly
scheduled discussion of voice alert, SKY-1, and aprs-is filtering.  :-)

Phil, N6TCT

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KD5XB -- Earl Needham http://groups.yahoo.com/group/cw_bugs Quoting from the Coast Guard: ZUT Posted via Blackberry


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