Anan 10E with random wide TX like other Hermes Lite users with Thetis

[Mike Mustang]

Hello Group,

   I have 2 Anan 10e ( which I believe is similar to a Hermes Lite) and I have random wide TX with Pure Signal on. I have confirmed that a few Hermes Lite users have this same problem with Thetis ( I have even tried this with the HL version).

  This problem does not occur with PowerSDR MRXPS  even with Pure signal enabled.

  This problem does not occur with my Anan 7000dle mkII hooked to the same computer and same Thetis.

The problem is tied to Pure signal because if this wide transmit occurs (I can see it on the TX display) I can turn off PS mid transmit and it goes away. Also unkeying and keying back up fixes it.

  I have a thread started on the Apache Labs Pure Signal forum with a few Hermes Lite users confirming the problem as well with no fix.

 Does anyone have this same problem or a fix?

Thank you.

73's

Mike WA3O

[Tm Hatch]

Hi Mike,

I have that same problem.  It will happen every time I have an SSB OSO.  Sometimes more then once in a QSO.  Also when trying to monitor my signal using the MON button the audio has terrible distortion.  I have quite using Thetis and went back to the old PowerSDR MRXPS.  Both problems don't exist with that version.

73

Tim

W0AHO

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[Mike Mustang]

Tim, 

Thanks for the responce. I wonder if you are using VAC audio or if you have a mic plugged in to the Hermes Lite? 

I am wondering why there are not more HL users responding with this same trouble?

I forgot to mention that I am using protocol 1.

73's

Mike WA3O

[Ezio Insinna]

Hello Mike,

I'm using HL2 with PS without any problem, however feeding back RF to the rig from a sampler is not without risk. I believe the feedback lets RF get into the rig

causing the phenomenon you are describing. Check the RF feedback carefully. Maybe the Thetis software processing renders your PC more sensitive to RF, especially if you use an USB microphone. 

Ferrite clips might help. I hope you can find a solution.

73

Ezio - K3EK / F5MWA

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[Mike Mustang]

Ezio,

  At this point all I am doing is using Pure Signal on the exciter only. I do have a 10E setup with the correct relay board from TAPR to use it with my LDMOS amp. I have a Anan 7000 MKIIDLE and the correct coupler and Pure Signal works 100% with the same Thetis/computer.  I only use us a Microphone pugged into the front of the 10E with no signs of RF in the shack.

73's

Mike WA3O

[Juergen Hussels]

Hello,

I believe this is not related to the output power or RF in the shack etc.

Actually I observed this for some time now, occasionally.

What definitely helps, is disabling the continous PS feedback by pressing "single Cal" in the Linearity-Menü.

But this Calibration is only valid for the frequency, where performed +/- a bit

I see the wide signal occasionlly when using a good dummy load with just 4 Watts.

Sometimes even switching PS-A  on off is still generating a wide signal in the "OFF" position.

It definitely is connected to Puresignal,

And I have seen wide signals with a Redpitaya, too. (0 mW no amplifier, just testing)

In Powersdr MRX I never noticed such a behaviour. 

I use PS now only with single Cal.

best regards,

Juergen

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[Ezio Insinna]

Hello Mike,

I'm a bit surprised because I think that the advantage of PS is to reduce the harmonics produced by the PA. If you use the PS on the exciter you do not know what the amplifier outputs.

Anyway here the pictures of my sampler (a bit out of focus, sorry) and of the resulting signal on the PA output.

I hope you can solve the problem.

73

K3EK / F5MWA

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[Mike Mustang]

K3EK,

   Yes PS does help clean up the amp signal nicely however, I was just testing it on the exciter only BEFOR I tried it on the amp.

Juergen,

  Your suggestion of "Single Cal" has FIXED my random wide transmit that happened randomly.

I am not exactly sure what single cal does but I have used it all day and have not had any trouble.

Thank you!

73's

Mike WA3O