risk is any off frequency noise from the sound card, harmonics etc
will also get transmitted not really a big issue if the sound card is
good quality.
Not quite accurate ... one can have a professional quality sound card
and if the levels are too high, the connections are not correct, the
ground gets opened, one has a significant degree of common mode RF on
the feedline, one has power supply issues, etc. DATA_A can be very
badly distorted/wide. AFSK A is not subject to those issues as long
as the narrow filter (CONFIG: AFSK TX) is enabled.
73,
... Joe, W4TV
On 2014-10-02 7:30 AM, david Moes wrote:
With AFSK-A the K3 has very a narrow DSP filter to maintain a really
good transmit IMD so you need to keep the modulating frequencies
within the chosen preset filter range 1275 in my setup. You can use
the waterfall to tune but you need to use DATA-A instead of AFSK-A risk
is any off frequency noise from the sound card, harmonics etc will also
get transmitted not really a big issue if the sound card is good
quality. I found that with the P3 the markers lined up with the mark
frequency so tuning with the VFO was quite convenient without the P3 I
may have been more tempted to use Data-A and tuning with the mouse
David Moes
President: Peterborough Amateur Radio Club.
[email protected]
VE3DVY, VE3SD
On 10/2/2014 06:32, David Cole wrote:
Why only tune the radio, and not use the Waterfall?
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