[R-390] Re: 390a II

[R. J Deeter]

Sorry Guys-
I never said i agreed with his numbers, I found them questionable (
actually impossible). I was only trying to giving insight to his reasons
for making the mods.  However, I do believe that some of the noise
generated by the front end and mixers may be reducible. by how much,  to
what advantage depending on the environment and at what cost, hmmmmm
didn't mean to stir up a hornets nest  especially when the original info
could have been a misprint? 
As Mark Twain mentioned one could possible die from a misprint.
I'll crawl back in the woodwork......
73
Renée (Ron), K6FSB
 ps i do agree, one aditional area- the pwr sply could use ripple
reduction.  

On Sun, 4 Jun 2006 17:40:28 +1000 "Bernard nicholson "
<vk2abn at bigpond.net.au> writes:
> 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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