[R-390] Re: 390a II

[Bernard nicholson]

Ron  He may have been using a short antenna BUT you cant get blood out of a
stone , even today you wont find any advertised Hf radios that  have
pretensions to sensitivities that are much better  than what can  achieved
with the 390A in stock standard form it is possible to achieve a sensitivity
of around 0.4 uv, in a narrow bandwidth   he quotes 0.02uv , the noise
voltage alone in a 50 ohm termination is around 0.026uv , and if the input
impedance is higher the voltage is higher,  I'm sorry Ron but his
sensitivity figures VIOLATE the fundamental laws of physics
----- Original Message ----- 
From: "R. J Deeter" <k6fsb at juno.com>
To: <vk2abn at bigpond.net.au>; <sandeenpa at yahoo.com>
Sent: Sunday, June 04, 2006 3:29 PM
Subject: Re: [R-390] Re: 390a II


> Perry and Bernie-
> the competition grade that was done by Ray at the time  he was in a very
> low rf environment and was trying to get high gain using a short whip /
> simple antenna(as per my memory in a conversation with Ray, ask him for
> verification he is very gracious) . Unfortunately that is not the
> situation for most of us, we are typically  using longer either bal or
> unbal tuned antennas, sometimes in the presence of a fairly high rf field
> (AM Broadcast or otherwise) I believe he is still running some of the RF
> mixer deck mods.
> IMHO the best changes are AGC , add a product detector and audio upgrades
> ( the P-P audio is marvelous after cleaning up the previous stages). To
> each his own......
> 73
> Renée (Ron), K6FSB
>
> On Sun, 4 Jun 2006 10:23:34 +1000 "Bernard nicholson "
> <vk2abn at bigpond.net.au> writes:
> > Perry a Suggestion !! open a Hotmail address [which will take you two
> > minutes] and I will send it to that !!, the article went over about
> > 4 issues
> > and is quiet informative and well thought  out , but the last issue
> > is the
> > competition grade 390A and he gets carried away, and to my mind
> > murders the
> > rx and waffles about a sensitivity of 0.02uv. for 10db
> > signoise+noise ,which
> > is impossible and denies the basic laws of physics  Hi   I
> > personally would
> > rather put my trust in Pappenfus , Bruene,&Shoenike than Ray
> > Osterwald Hi
> > regards to everyone   73 s  Bernie Nicholson
> > ----- Original Message ----- 
> > From: "Perry Sandeen" <sandeenpa at yahoo.com>
> > To: "Bernard nicholson" <vk2abn at bigpond.net.au>
> > Sent: Sunday, June 04, 2006 2:43 AM
> > Subject: Re: 390a II
> >
> >
> > > Hi Bernie,
> > >
> > > Yeah, still havin trouble with yahoo and pdf.  If you could
> > instert it int
> > a word .doc then it
> > > will come through.  Why? I don't know
> > >
> > > Regards, Perrier
> > >
> > >
> > >
> > > --- Bernard nicholson  <vk2abn at bigpond.net.au> wrote:
> > >
> > > > Perry I have the article scanned but last time I sent you a
> > acrobat Doc
> > you couldn't open it
> > > > regards from Bernie nicholson
> > >
> > >
> > > __________________________________________________
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> > > Tired of spam?  Yahoo! Mail has the best spam protection around
> > > http://mail.yahoo.com
> > >
> > >
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