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Re: [RTTY] Question

To: rtty@contesting.com
Subject: Re: [RTTY] Question
From: Bill Turner <dezrat@outlook.com>
Date: Sat, 17 May 2014 13:37:27 -0700
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
ORIGINAL MESSAGE:          (may be snipped)

On 5/17/2014 1:22 PM, Fred Souto Maior wrote:
Can someone pse tell me how many kcs are used by a RTTY signal ??
This is relative to people operating split and receiving up 1 Khz.
Usually the TX frequency of the DX station is QRMed by the callers
just 1 and some times less then 1 up. And if we have a local stn calling
it's impossible to get a decent signal from the DX. Why not put the RX
frequency 2 or 3 up ??

Fred - PY7ZZ

REPLY:

For an amateur RTTY signal with 170 Hz shift, the transmitted bandwidth is about 300 Hz, or .3 kHz. The problem you mention above happens because many ops use a receive bandwidth much wider than that and the supposed QRM results. A split of 1 full kHz is more than enough when using a narrower receiver bandwidth.

Also, a very strong station 1 kHz away can desense your receiver if it does not have an appropriate roofing filter. This is not really "QRM" but rather inadequate receiver performance.

73, Bill W6WRT
dezrat@outlook.com
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