[amsat-bb] Re: Listening on USB when operating CW
richard.siff at verizon.net
Sat Feb 8 10:01:31 PST 2014
1/2 the time I do not have a key plugged into the rig. I do call a CW op on
SSB but have not had a reply.
Back in the 80s there were a lot more CW ops.
Anyway I have no complaint any OSCAR contact is a good one.
Wish I could have worked the Alaska station today, awesome signal. Hope he
made a lot of "Qs".
----- Original Message -----
From: <tosca005 at umn.edu>
To: "Kevin M" <n4ufo at yahoo.com>
Cc: <amsat-bb at amsat.org>
Sent: Saturday, February 08, 2014 12:33 PM
Subject: [amsat-bb] Re: Listening on USB when operating CW
> I don't think that the OP was trying to complain about SSB operators being
> less capable or less polite or less facile in their Doppler tuning
> correction or whatever in comparison to CW operators. He was just making
> an observation that sometimes two pairs of communicating operators have
> their frequencies "collide" due to shifting Doppler and different ways of
> tracking the tuning to compensate.
> The issue is that (at least on all of my radios), when you are set to
> receive in CW mode the radio does narrow its bandwidth considerably to get
> the maximum benefit of CW's narrower frequency bandwidth requirement,
> which is part of what makes it able to dig deeper into the noise level and
> pull out an intelligible signal. When I am set to receive in CW and tune
> in an SSB station (for example, during a terrestrial contest when there
> are lots of signals of both types present), I can't understand the SSB
> conversation, but if I am set to receive in SSB, the radio sets a wider
> bandwidth and I can hear a CW signal quite well, and understanding it is
> mainly dependent on how well or poorly I can copy CW at all. So the OP was
> pointing out that if the CW operator was set to receive in SSB instead of
> CW, he would lose the selectivity of the narrower bandwidth but probably
> would still be able to copy the CW signal, with the added benefit of being
> able to hear and understand a SSB QSO whose frequency happened to collide
> with his CW operating frequency. No judgment was meant to be implied on
> who intruded on whom, or why (strictly because of shifting Doppler vs.
> different techniques of Doppler tuning correction). Just that for whatever
> combination of reasons, the two QSO's happened to cross frequencies and
> intrude on one another. By listening in SSB mode the CW operator would
> become more aware of the intrusion and could better adjust his tuning to
> avoid it or move away from the colliding signal.
> When I am operating in a terrestrial VHF/UHF/microwave contest, there are
> times when I can hear an operator well enough to copy him on SSB, but he
> is unable to hear me well enough to copy me on SSB. I will then switch to
> CW mode and send my information that way, counting on the superior
> legibility of CW (to an operator who understands CW) to get my information
> across. The problem that arises is that if the other operator copies my CW
> and realizes that I copied his SSB just fine, he may reply in SSB (because
> he doesn't have to change any settings on his radio, he just hits the
> transmit button and talks), and with my radio set to CW mode, I can no
> longer copy him legibly. So I have to quickly switch back to SSB mode as
> soon as I finish sending my CW to hear his SSB reply. I guess my point is
> simply that while I have not experienced the exact problem that the OP was
> talking about, since I don't normally operate CW on the satellites, I
> understand what he is talking about regarding the legibility of a CW
> signal in SSB receive mode vs. the illegibility of an SSB signal in CW
> receive mode.
> Bottom line: if you can hear the CW coming down from the satellite well
> enough in SSB mode, it might very well be a good idea to listen in that
> fashion. It may or may not be easy to configure your radio(s) to transmit
> CW and listen to SSB, but if you can do it, and not lose the CW signal in
> the noise, it may be a good way to go.
> 73 de John Toscano, W0JT/5, AMSAT-NA LM#2292
> On Feb 7 2014, Kevin M wrote:
>>> Computer-control stations and manual-control stations are adjusting for
>>> Doppler differently. I have done - and will continue to do - both. In my
>>> opinion, neither is incorrect; they simply differ from each other.
> This was posted during the assemblage of my long winded reply. I think it
> gets at the same thing I was beating around the bush at. I'm glad to know
> when I am eventually able to get back on the linear birds (yagis, preamps,
> cables and rotor in the closet... conduit for burying piled up outside) I
> will be able to find someone to work without getting my rig hooked up to a
> PC. (It will be enough to get the rotor hooked up to one!) I just hope I
> can remember which dial to turn when... anyone hearing me screw the pooch,
> please send instructions promptly! X^D
>>proud to be a full fledged Gridiot!
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