[pskmail] Re: Test result

  • From: John Douyere <vk2eta@xxxxxxxxx>
  • To: pskmail@xxxxxxxxxxxxx
  • Date: Thu, 15 Dec 2011 21:35:05 +1100

Hi Gunnar,

At short distance you can get severe overloading of the receivers.

The non-linearity can cause real issues for modes like PSK as they require
good linearity.

On the other hand, Thor and Mfsk modes don't require linearity.

Hence my question about the comparison between their performance.

73, John

On 15/12/2011 9:00 PM, "Pär Crusefalk" <per@xxxxxxxxxxxx> wrote:

> Hi,
>
> First thing that comes to mind after that description is AGC. Are you
> using a slow AGC? If the signal is close by then it is strong, that
> means AGC will kick in and reduce receiver gain. If you are using a slow
> AGC then much of the frame can be lost during the time that AGC is
> slowly increasing again. If you are using slow then try a fast AGC.
>
> 73 de Per, sm0rwo
>
>
>
>
> tor 2011-12-15 klockan 10:41 +0100 skrev Gunnar Bulukin:
> > Thanks John and Rain,
> >
> > I will check all of the things but strange is that Rein could ping
> > with PSK500R and I cannot 25 m from the shack.
> > One thing that would be interesting to know is if any Eu client can
> > connect and download a IAC Fleetcode and check and down/upload mail.
> >
> > //gunnar
> >
> >
> > ______________________________________________________________________
> > From: pskmail-bounce@xxxxxxxxxxxxx
> > [mailto:pskmail-bounce@xxxxxxxxxxxxx] On Behalf Of John Douyere
> > Sent: Thursday, December 15, 2011 1:53 AM
> > To: pskmail@xxxxxxxxxxxxx
> > Subject: [pskmail] Re: Test result
> >
> >
> >
> > Hi Gunnar,
> >
> >
> > The best option I believe would be for someone in Europe to remotely
> > look at your server PC while doing the tests. I use reverse VNC for
> > that purpose as it is very simple and is initiated by a person in
> > front of the PC so there is no security issue.
> >
> >
> > Otherwise from here I made a list bellow of the items to check. Sorry
> > if some are trivial and obvious to you, but I am trying to make a
> > complete list.
> >
> >
> > Since you can get the other servers to respond AND you get better
> > responses from your server in PSK250R than in PSK500R I come to the
> > conclusion that a) your IC-703 setup is working fine and b) something
> > on your server side is not quite right.
> >
> >
> > I would check, in descending order of likelihood, the following items:
> >
> > 1. The signal levels in Fldigi. The little diamond at the bottom right
> > part of the Fldigi window, next to the AFC button,  should be green
> > all the time, assuming your rig's AGC is working properly. Black =
> > signal too high, Yellow or RED = signal input too high.
> >
> >
> > 2. The frequency set on Fldigi should be 1500Hz since that is what
> > your offset must be in the config file (as the server puts the dial
> > frequency 1500hz below the freq table frequencies).
> >
> >
> > 3. The settings in Fldigi, in particular:  in the misc/pskmail tab
> > "Carrier Frequency" is 1500, "reset to carrier" is ticked, the search
> > range is about 30 to 50Hz and the "acquisition S/N" between  6 to 13dB
> > (9 by default) , in the misc/sweet spot tab the "sweet spot" at 1500hz
> > for "psk et al".
> >
> >
> >
> >
> > Further tests I would do:
> >
> >
> > 1. Try some beacons in MFSK32 and THOR22 modes, settting TX RSID ON in
> > Fldigi before sending the beacon. Note how they work compared to
> > PSK250R and between themselves.
> >
> >
> > 2. If you can use a remote access (WIFI or wireless network), used the
> > VNC server / client combination to monitor your server while trying
> > from a distance. Monitoring the Fldigi window is particularly
> > informative regarding the signals and the decoded frames.
> >
> > Hope this helps,
> >
> >
> > 73, John
> >
> > On Thu, Dec 15, 2011 at 9:29 AM, Gunnar Bulukin <gunnar@xxxxxxxxxx>
> > wrote:
> >         Hi all,
> >
> >         I have during two days done some interesting tests with 1.0.4
> >         and the latest server version and here is the result:
> >         1. I took my IC-703 to town today and tested to see if I could
> >         get in contact with SA6BQZ-1 No contact but reply from DL, OE
> >         and F8
> >         This after getting some very good help from Pär with the
> >         setting of IC-703, thanks Pär!
> >         From this I can assume that there is nothing wrong with the
> >         IC-703!?
> >
> >         2. Back at home I tried again but no go, until I changed to
> >         PSK250R!!! PSK500R does not work!
> >         Pinging directly SA6BQZ-1 sometimes replies open ping no reply
> >         Sending position I get a QSL all of the times!?
> >
> >         The server is running under Ubuntu with a IC-7200 The freq
> >         table is all set to 10148. The setting on the display is
> >         10146,5 both on TX and RX.
> >
> >         I think that I am going crazy, don't know what to do now. I
> >         don´t get any QSL from any stations when beaconing.
> >
> >         I badly need some proffs help ;-) So please give me some
> >         advice how to solve this very strange problem.
> >
> >         73 de Gunnar
> >
> >         2011-12-14 12:17:01 UTC: SA6BQZ>PSKAPR,TCPIP*,qAS,DL4OAH-8:!
> >         5741.50N/01141.90EY000/000/Testing  for S/Y Vagspel,
> "vinterstored" on land;-)
> >         2011-12-14 12:46:32 UTC: SA6BQZ>PSKAPR,TCPIP*,qAS,OE5RTL:!
> >         5741.50N/01141.90EY000/000/Testing  for S/Y Vagspel,
> "vinterstored" on land;-)
> >         2011-12-14 12:54:44 UTC: SA6BQZ>PSKAPR,TCPIP*,qAS,F8COJ-9:!
> >         5741.50N/01141.90EY000/000/Testing  for S/Y Vagspel,
> "vinterstored" on land;-)
> >         2011-12-14 17:41:49 UTC: SA6BQZ>PSKAPR,TCPIP*,qAS,SA6BQZ-1:!
> >         5741.50N/01141.90EY000/000/Testing  for S/Y Vagspel,
> "vinterstored" on land;-)
> >         2011-12-14 18:06:54 UTC: SA6BQZ>PSKAPR,TCPIP*,qAS,SA6BQZ-1:!
> >         5741.50N/01141.90EY000/000/Testing  for S/Y Vagspel,
> "vinterstored" on land;-)
> >
> >
> >
> >
>
>
>
>

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