3353Re: Sked and rx frequency - help and clarification
- Nov 18, 2006Paul,
once again my apologies to you and all the other friends that replied
to my question.
I have received and read your mails both on WSJT and direct to my
Let me just inform you that i had sent my reply and thanks to all of
you already on November 14th but i did probably an uncorrect
operation while sending the answer back on the WSJT area.
Therefore herebelow is the text that i wrote few days ago thanking
all of you for the kind, prompt and precise support.
- - - - - - - - - -
thank you very much all of you for the appreciated suggestions.
Due to the replies and to the emails received on my mail account i
have understood very well principles, tecniques and i realized that
my FT-736R would probably require a freq calibration.
So thanks Jim (AF6O), Lee (AA1YN), John (W5UWB), Paul (G4DCV) and Don
(KE7NR) for the valid support and CU all via the moon.
Enrico - IZ0GYP
- - - - - - - -
So, once again, thanks and sorry if my post did not came through.
I will be trying to call starting from tomorrow morning.
Ciao e grazie
--- In email@example.com, Paul Whatton <paul@...> wrote:
> Hi Enrico
> Congratulations on your QRP EME. I'm also using a small station
> very similar to yours, a FT736R, 400 watts and a single 9 element
> The FT736R is very stable and works really well on WSJT. The FT-
> much stabler than my second rig, an Icom 746.
> It sounds from what you sayt that your 736 calibration is 700Hz
> Mine is about 200Hz out, so I know when my display reads say,
> I am actually on 144.130. So just take your 700Hz error into
> even better if you have the workshop facilities you could re-
> your display.
> Having done that you know what frequency you are tuned to, but what
> about the doppler? On 2m it is only a maximum value of about 300Hz
> most of the time much less than that if like me you use elevation.
> it is nice to be close to the correct frequency and the doppler can
> tricky to get your head around. Having said that, if there is a
> it's often better to call a bit off frequency!
> I don't pretend to be an expert and maybe someone will correct me
> wrong here. But this is what I figured out.
> If you have a sked then yes you are right, transmit on what you
> be the correct frequency and stay there. Then look for your sked
> to be shifted by his doppler. You won't need the RIT, his traces
> just be offset away from the centre frequency in WSJT by the amount
> his doppler plus/minus any error in his transmit frequency. That's
> BTW. I've noticed that even some big guns are not always exactly on
> frequency they say they will be :-) If (when) you find your sked
> is a long, long way off frequency then you have a dilemma. Should
> stay where you are or should you move?
> But how about when you want to answer a CQ?
> Even with just a single 9 element the majority of QSOs I make are
> calling someone. Either by tail ending or by answering their CQ
> Most are random, I usually don't tell them in N0UK or ON4KST that
> going to call.
> Here's what I do. Let's say I hear a station calling CQ and when
> decodes him it indicates I am receiving him with a DF of +300Hz.
> entering his locator tells me his doppler is actually say, -120Hz.
> retune the receiver to a frequency 420Hz higher. I should now get a
> of -120HZ on his decoded signal, the same figure as his predicted
> doppler shift. I then call him on that frequency. If I have it
> out correctly this will make my transmit frequency the same as his,
> my received signal will be close to where he hears his own echos
> the stations I work will be able to hear their own echos).
> As an alternative, if you really want to use the RIT you can dial
> amount of the doppler and then aim to receive the other station
> DF of 0.
> I didn't have much time in the EME contest yesterday before I had
> out. But I called CQ and two stations called me who were both
> "off-channel" by about 100Hz more than I would have expected from
> doppler. So don't worry about it too much, even the big EMEers are
> always spot on frequency.
> 73 Paul G4DCV
> Enrico - IZ0GYP wrote:
> > Hi all,
> > I'm a novice for EME (QRP with 9 element and 200W) and i'm still
> > studying the JT65B to be more familiar with the communication
> > procedures, trying to avoid mistakes and loose of time to the
> > that would reply to my skeds.
> > Up to now i succesfully completed 3 QSOs.
> > Anyhow my problem is the following.
> > If someone, on the EME chat, state a CQ call on 137 (144.137) this
> > means that both the calling station and the station that would
> > reply to his call shall have the VFO on 137,0 during TX.
> > Now, i'm using a FT-736R and i'm almost sure about correctness of
> > freq calibration.
> > Usually a receive CQ station EME calls at SpecJT center when my
> > approx. 0,7 KHz higher (144.137,7).
> > Otherwise, leaving the VFO at 137,0 , i will see caller EME
> > the far right side of the SpecJT screen (or even outside).
> > That's of course due to the Doppler effect but my concern is if
> > KHz is a standard frequency doppler shift on VHF or is a little
> > too big?
> > Due to my QRP conditions i can't receive my own echoes and the
> > stations will see only light signals on their PCs.
> > I would like also to be sure at least that i'm not spending time
> > calling on a wrong frequency where the CQ caller station would
> > receive me.
> > Shall i therefore use the second FT-736 VFO on 0,7 KHz higher
> > rx (FT-736R does not have independent RIT function)?
> > Is my understanding correct that if i will be transmitting on the
> > frequency also my EME signals will be "falling" in the center
> > SpecJT screen of the other station (i guess that he will be also
> > listening 0,7 KHz higher)?
> > Sorry if the questions may be appear probably confused (or even
> > terrible) to you but your help will be very appreciated on my
> > Thanks for your kind reply and understandings
> > Best 73's de Enrico - IZ0GYP
> > ------------------------------------------------------------------
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