[TenTec] Question for the list

[Kenneth Stringham]

Dave,

Do you have an oscilloscope? I had a problem with a
blown DBM in my Omni 546C when I first bought it. I
replaced the defective chip and used my oscilloscope
to adjust the balance.

Concerning the balance, this should not affect you
signal quality. The real problem is the amount of
carrier that will accompany your signal. The other
sideband will be suppressed even more by the filter.

The real issue when you discuss sound quality is the
bandwidth present in your signal. With 2.4KHz, you are
cutting of the upper 300Hz of you audio passband. This
will limit fidelity of signal, but not the
readability.

When you discuss the additional filtering, you should
make sure you transmitter path has the 2.8KHz.
filtering and the other filters should only be in the
receiver path. I know that this is the case in the
older Omni I had.

I hope this information is of some use to you.

Ken

--- David Drake <drake at fullnet.com> wrote:

> Jon,
> Thanks for the encouragement.  Sounds like its worth
> a try.  I was most 
> concerned as to getting the carrier balance right,
> if it needed 
> adjustment.  Regarding the Corsair, (I had one), the
> early model (Brown 
> panel), had only a 4 or 6 pole? 2.4 filter in the
> first IF.  I put the 
> optional 8 pole 2.4 in mine from TT and it really
> came alive, so if 
> yours was the early model and you went to an Inrad,
> it should have been 
> significant. The later "white face" Corsair II had
> the 8 pole as stock.
> Regards,
> David Drake, Wd9cmd
> 
> ----- Original Message ----- 
> From: <K6jek at aol.com>
> To: <tentec at mailman.qth.net>
> Sent: Wednesday, September 15, 2004 3:05 PM
> Subject: Re: [TenTec] Question for the list
> 
> 
> >I put the 2.8 Khz INRAD filter in place of the 2.4
> in my Paragon II and 
> >liked
> > it so much I did the same thing to my Corsair.  
> Especially on the 
> > Corsair
> > (don't ask me why) it made a big difference in the
> receive audio.   On 
> > both it
> > greatly improved transmit audio, enough that the
> rag chewers I hang 
> > out with
> > tell me it sounds very good.   They didn't do that
> before.   These 
> > guys have
> > fancy stuff and good ears.
> >
> > Since both of these transcievers have optional
> filters in the second 
> > IF, I
> > haven't missed the extra selectivity I'd be
> getting with the 2.4 vs 
> > the 2.8 in
> > the first IF.    On the Paragon, the 2.8/1.8 combo
> is more than enough 
> > for
> > tough conditions.   On the Corsair I have 2.8/2.4
> which seems fine 
> > too.
> >
> > One more thing.   On both of these it's possible
> to have no filter in 
> > the
> > second IF -- that's called 6.0 on the Paragon II
> and a capacitor I 
> > soldered in to
> > one of the optional filter slots on the Corsair.  
> That's the way I 
> > run both
> > of them most of the time -- no filter in the
> second IF.
> >
> > And yet another thing.   On neither transcievers
> did I need to reset 
> > the
> > carrier balance .   I checked them.   They were
> fine.   Others have 
> > fooled around
> > with the carrier frequency on the Corsair and
> claim to get outstanding 
> > audio
> > by shifting it a bit.    I haven't done that
> either but might.
> >
> > Jon, K6EK
> >
> >
> > In a message dated 9/14/04 2:18:44 PM,
> drake at fullnet.com writes:
> >
> >
> >> Has anyone tried an inrad 9mhz filter in the main
> transmit/receive 
> >> slot
> >> instead of the stock 2.4. I've been threatening
> to buy one or two
> >> inrads for some time for my Omni V. I have heard
> that you must re-set
> >
> >> the carrier balance to get it right. Is that so?
> If that is correct, 
> >> I
> >> may need some help on how to do just that.....I'm
> about ready to 
> >> order a
> >> couple inrads!
> >>
> >> I was thinking of a 2.8 in the main T/R slot,
> moving the stock 2.4 to
> >> the narrow. Then buying a 2.1 inrad for the 1.8
> slot in the second 
> >> IF.
> >> All for SSB operating.
> >>
> >> Any comments? PS, Lets keep the list alive and
> well. I tried
> >> Contesting.com and found it much like our
> hallicrafters and heathkit
> >> lists here.....lots of ego's to deal with. But I
> still tolerate it 
> >> for
> >> the sake of information.
> >>
> >> David Drake, Wd9cmd
> >>
> >
> > _______________________________________________
> > Tentec mailing list
> > Tentec at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/tentec
> > 
> 
> 
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> 



		
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