[TenTec] Omni vi plus input audio feed for psk

Sun May 29 19:20:54 EDT 2005

I'd like to read it.

----- Original Message ----- 
From: "Robert & Linda McGraw K4TAX" <RMcGraw at Blomand.Net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, May 30, 2005 02:42
Subject: Re: [TenTec] Omni vi plus input audio feed for psk

> Ground loop city.  That's the cause of your ills and hum.  Not a uncommon
> issue with most ham station wiring and grounding.  I don't consider it
luck.
> It is simply proper planning and correct grounding techniques applied
>
> This says your station ground and AC mains ground are not bonded together
> thus a difference in potential exists as you discovered.  A great
invitation
> for lightning damage from a nearby strike.  The RS transformer simply
breaks
> the ground loop but does nothing to provide proper grounding.
>
> If you wish, I'll send you a paper on Lightning Protection for the Home
and
> the Station.  Many ham stations are dangerously grounded.  A separate
E-Mail
> request will get you the Microsoft Word document.  It's about 128K in
size.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "joel hallas" <jrhallas at optonline.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Sunday, May 29, 2005 6:35 AM
> Subject: Re: [TenTec] Omni vi plus input audio feed for psk
>
>
> > Bob,
> >
> > You may be very lucky! With my Paragon (line out) to sound card input I
> > had a very loud hum on SSB xmit (I know that's the other side <g>), even
> > when the computer was off.
> >
> > In my station, I have separate power feeds for radio equipment and other
> > stuff and it appears that there was a sufficient difference in "green
> > wire" ground voltage to cause a hum.
> >
> > By putting a RS isolation transformer in that lead it took care of the
> > problem, for $1.75, I think. BTW, the transmit side was isolated in the
> > Rigblaster, or likely would have had the same problem.
> >
> > Regards, Joel, W1ZR
> >
> > Robert & Linda McGraw K4TAX wrote:
> >
> >>Denton:
> >>
> >>First, the transformer may be "ringing" with square wave signals as a
> >>result
> >>of the transformer secondary not being correctly loaded.
> >>
> >>At my station, I connect direct from the sound card line IN/OUT to the
> >>Audio
> >>In / Audio Out of the Omni VI+.  No problem in adjusting levels with the
> >>Mixer settings of the sound card and the MIC gain on the Omni VI+ runs
> >>about
> >>9 o'clock which is normal. I use VOX to do the switching and get great
> >>reports at about 35 to 45 watts output.
> >>
> >>I find that most folks "over engineer" the project.
> >>
> >>73
> >>Bob, K4TAX
> >>
> >>----- Original Message ----- 
> >>From: "denton" <denton at oregontrail.net>
> >>To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> >>Sent: Saturday, May 28, 2005 6:36 PM
> >>Subject: [TenTec] Omni vi plus input audio feed for psk
> >>
> >>
> >>
> >>
> >>>I am currently using my omni vi plus for psk, with the output of the
> >>>soundcard going to an audio transformer to give me a good match to the
> >>>audio
> >>>input jack in the back of my Omni....on the air reports indicated good
> >>>imd
> >>>at 40 watts out of the rig at -31, but sometimes I get a ringing report
> >>>and
> >>>indication of minor sidebars.
> >>>What I want to do is bypass the mic audio amp to give me much better
> >>>linearity for the various soundcard modes.
> >>>>From examining the schematic and its adjoining criteria, it seems that
I
> >>>
> >>>
> >>>>can
> >>>>
> >>>>
> >>>feed the audio out from the soundcard directly to the input of the
> >>>balanced
> >>>modulator, with appropriate filtering and limit the output of the rig
to
> >>>about 35 watts or so.
> >>>Any thoughts on this?? thanks...
> >>>----- Original Message ----- 
> >>>From: "John L Merrill" <jmerrill1 at adelphia.net>
> >>>To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> >>>Sent: Saturday, May 28, 2005 4:03 PM
> >>>Subject: Re: [TenTec] SSB recieve audio?
> >>>
> >>>
> >>>
> >>>
> >>>>I have a MkV Field and an FT1000D and with internal or external
speaker
> >>>>they sound better to my inner or outer ears than my on the chopping
> >>>>block Orion with external and internal speaker. The OmniVI+ with the
> >>>>audio mod in it sounds better than an Orion.
> >>>>
> >>>>John N1JM
> >>>>
> >>>>denton wrote:
> >>>>
> >>>>
> >>>>>Wonder how the Orion's SSB audio sounds compared to an Omni VI??
> >>>>>For some reason, to my ears, my FT990 seems to sound better than my
> >>>>>Omni
> >>>>>VI
> >>>>>on ssb.
> >>>>>----- Original Message ----- 
> >>>>>From: "John L Merrill" <jmerrill1 at adelphia.net>
> >>>>>To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> >>>>>Sent: Saturday, May 28, 2005 2:51 PM
> >>>>>Subject: Re: [TenTec] Propm RX
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>I have an R4A I've been repairing here on the bench and with the
same
> >>>>>>speaker, it sounds better than the Orion :-).
> >>>>>>
> >>>>>>John N1JM
> >>>>>>
> >>>>>>Grant Youngman wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>>I agree. The receive audio is lousey on the Orion.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>Maybe you just need a decent speaker.  Or perhaps your inner ear
> >>>>>>>needs
> >>>>>>>some
> >>>>>>>work :-)
> >>>>>>>
> >>>>>>>The Orion has excellent SSB receive audio, as good or better than
any
> >>>>>>>HF
> >>>>>>>rig
> >>>>>>>I've used (many, new and old), and generally requires little in the
> >>>>>>>way
> >>>>>>>of
> >>>>>>>receive EQ.  I do much prefer it with a little more than the usual
> >>>>>>>bandwidth
> >>>>>>>(say around 3 Khz or so), but that's no different than most radios
> >>>>>>>which
> >>>>>>>sound like cr*p at the typical narrow bandwidths everyone want to
> >>>>>>>use.
> >>>>>>>
> >>>>>>>Of course, it would benefit greatly from a pair of P-P 6V6's in the
> >>>>>>>output
> >>>>>>>stage, but I doubt that's in the plan :-)
> >>>>>>>
> >>>>>>>Grant/NQ5T
> >>>>>>>
> >>>>>>>
> >>>>>>>_______________________________________________
> >>>>>>>TenTec mailing list
> >>>>>>>TenTec at contesting.com
> >>>>>>>http://lists.contesting.com/mailman/listinfo/tentec
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>_______________________________________________
> >>>>>>TenTec mailing list
> >>>>>>TenTec at contesting.com
> >>>>>>http://lists.contesting.com/mailman/listinfo/tentec
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>_______________________________________________
> >>>>>TenTec mailing list
> >>>>>TenTec at contesting.com
> >>>>>http://lists.contesting.com/mailman/listinfo/tentec
> >>>>>
> >>>>>
> >>>>>
> >>>>_______________________________________________
> >>>>TenTec mailing list
> >>>>TenTec at contesting.com
> >>>>http://lists.contesting.com/mailman/listinfo/tentec
> >>>>
> >>>>
> >>>>
> >>>>
> >>>_______________________________________________
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> >>>
> >>>
> >>>
> >>
> >>
> >>_______________________________________________
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> >>
> >>
> >>
> >
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> >
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>
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