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
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|