Re: QRP/Weak signals -- Frequency Drift
- Mark --
1. Try this:
PSK31 (BPSK) is "sideband-independent" -- it works equally well in USB
So, have a QSO in USB. Let's say the signal frequency on your
waterfall drifts upward.
Let the rig cool down.
Then, have a QSO in LSB.
If the frequency on the waterfall drifts up, the problem is with the
If the frequency on the waterfall drifts down, the problem is with the
2. There may be an "AFC Range" adjustment hidden in your software.
If so, set it really wide. Then the AFC adjustment will follow the
drifting signal, and you can forget about the problem!
--- In 30meterPSKGroup@yahoogroups.com, "n9wys" <n9wys@...> wrote:
> Sholto (or anyone else who may know)...
> I am running my digital modes on an older Pentium computer here in the
> shack, and as such, I:m sure the sound card in it is not the "best and
> greatest" available - rather, it's probably close to bottom shelf. My
> problem is the RX drifts up about 2-4 Hz when I stop transmitting. What
> this does is it forces me to "chase" the signal of the sending
> it settles down - about 10 - 30 seconds later.
> Is this a calibration issue with the sound card, or is it just
because it is
> a cheap card, or cold there be some other cause (such as receiver
> My station is a TenTec Omni VI, and on any other mode I see NO ill
> on receive, even after a long key-down transmit session.
> This "drift" is one reason why I have been conspicuously absent from the
> digital modes - it is EXTREMELY frustrating when I make a contact,
> me and the other station, only to have to keep asking the sending
> repeat while I try to chase their signal on the waterfall.
> Any suggestions are welcome - including the obvious "buy a new sound
> If that is the resolution I need to pursue, please advise which card I
> should look at... and remember this will be going into a P-120 box.
> Many thanks!
> Mark - N9WYS
> 30MDG #0043
- --- In 30meterPSKGroup@yahoogroups.com, "n9wys" <n9wys@...> wrote:
> OK, thanks Daithi. I understand.
> Now, do you know anything about MixW - is there a place to set the
> of frequency change that the program will "follow" with AFC ON? Orshould I
> not worry about AFC at all and operate with it off?personally, i operate mixw with AFC clicked off.