Jack Smith <[EMAIL PROTECTED]> wrote:
First, I have a definite bias to stand-alone equipment that works without
a computer.
I'll second that!
.On HF, a panadapter can show you a pile up quickly, or in general give you
a good idea where the activity is at any given instant.
In a pile up situation I have found it very useful to be able to turn on a
line marker which shows where my transmitter frequency is positioned with
respect to the other callers, before transmitting, and using a span which
covers the DX station's frequency and his listening frequencies. If the DX
is working SSB 'wide split' e.g. transmitting on 7205 kHz and listening
7060 kHz, I would monitor 7060 kHz +- with the panadapter (and audio) while
listening to the DX's audio on 7205 kHz.
For these uses, in my view, a panadapter requires a span of at least 100
KHz, and preferably more. The Z90 has a maximum default span of 200 KHz,
and maximum user-defined span of 250 KHz. In retrospect, I wish that I had
made it 500 KHz, with perhaps 3 KHz resolution bandwidth, as it would
provide a greater overview of most of an HF band (excluding 10 meters, of
course).
With respect my personal view is that a span of 200 - 250 kHz is ample for
routine monitoring purposes at HF and VHF. For greater spans the receiver
can be put into SCAN mode while using the panadapter as long as the
receiver's scan rate is not too high. My K2 scans too rapidly for my
purposes at VHF.
73,
Geoff
GM4ESD
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