[TenTec] Re: Paragon Question - Lack of sensitivity

[Steve Baron - KB3MM]

I said Siemens, looks like i forgot Philips:

http://www.semiconductors.philips.com/similar/BA482_1.html

http://www.semiconductors.philips.com/pip/BA482_1.html

Isn't the BA prfix on the diode designator indicate a europe designation ?
or do the Japanese use the same scheme as europe?

----- Original Message ----- 
From: "Tommy" <aldermant at alltel.net>
To: "Steve Baron - KB3MM" <SteveBaron at StarLinX.com>; <tentec at contesting.com>
Sent: Thursday, February 03, 2005 20:12
Subject: Re: [TenTec] Re: Paragon Question - Lack of sensitivity


> P/N  BA 482
>
> Tom - W4BQF
>
> ----- Original Message ----- 
> From: "Steve Baron - KB3MM" <SteveBaron at StarLinX.com>
> To: <tentec at contesting.com>
> Sent: Thursday, February 03, 2005 11:04 AM
> Subject: Re: [TenTec] Re: Paragon Question - Lack of sensitivity
>
>
> > What diodes do they use?
> >
> > ----- Original Message ----- 
> > From: "Tommy" <aldermant at alltel.net>
> > To: <tentec at contesting.com>
> > Sent: Thursday, February 03, 2005 14:37
> > Subject: Re: [TenTec] Re: Paragon Question - Lack of sensitivity
> >
> >
> >> I'm not sure about the Paragon, but the Omni 6 series radios do
> >> use
> >> cheap JA pin-diodes. (which turned out to be the best one's to
> >> use!)
> >>
> >> I fell for the idea of replacing all of the Ten Tec installed
> >> pin-diodes for the 'better' Hewlett-Packard pin diodes, which
> >> were
> >> quite expensive. Course when you change to the HP pin-diodes, you
> >> have to adjust the current throuh the diodes so they work
> >> correct.
> >> Bottom line was I wasted some nickles and a heck of a lot of
> >> time,
> >> as I found no improvement at all in performance of the Omni 6
> >> receiver. Actually I would say that the HP pin diodes did not
> >> preform as well as what Ten Tec had in the radio origanally.
> >>
> >> Of course the diodes that switch the band-pass filters
> >> (hopefully)
> >> do not see and are not switched by RF at all. It's all DC
> >> switching.
> >> To obtain the same or better performance when you replace
> >> pin-diodes
> >> you really have to know what current to run through the diodes to
> >> obtain the best isolation, etc. You are taking some chances when
> >> you
> >> replace Ten Tec component's with something that is 'better'.
> >>
> >> I think I have found, over the years of using Ten Tec radio's,
> >> the
> >> best way to 'improve' them is to keep the covers on them at all
> >> times and keep your paw's out of them...unless of course you
> >> adding
> >> a roofing filter. Not a heck of a lot needs improvement anyway!
> >>
> >> Tom - W4BQF
> >>
> >> ----- Original Message ----- 
> >> From: <c-hawley at uiuc.edu>
> >> To: <tentec at contesting.com>
> >> Sent: Thursday, February 03, 2005 9:16 AM
> >> Subject: Re: [TenTec] Re: Paragon Question - Lack of sensitivity
> >>
> >>
> >> > If these are the diodes that switch in and out the input
> >> > band pass filters, you are better off with pin diodes which
> >> > switch much slower than 4148s. The reason is so that strong
> >> > incoming rf does not switch the diodes that are supposed to
> >> > be on (or off) for the band you are using. This was a big
> >> > issue which became popular about 10 years ago. There are
> >> > some kits available to convert the fast switching diodes to
> >> > pin diodes. But, don't go and wholesale replace every diode
> >> > in sight. I think some of these kits were somewhat ill
> >> > advised. Your receiver may use pin diodes already in many
> >> > places.
> >> > Chuck, KE9UW
> >> >
> >> > ---- Original message ----
> >> >>Date: Wed, 2 Feb 2005 15:35:58 GMT
> >> >>From: "ultrafixedwing at juno.com" <ultrafixedwing at juno.com>
> >> >>Subject: Re: [TenTec] Re: Paragon Question - Lack of
> >> > sensitivity
> >> >>To: tentec at contesting.com
> >> >>
> >> >>
> >> >>Will a 1N914/4148-Type Diode work in the Paragon front end?
> >> > It's a silicon switching diode. If so, I'll run out and get
> >> > a handfull.
> >> >>Thanks,
> >> >>Paul
> >> >>KS2S
> >> > _______________________________________________
> >> > TenTec mailing list
> >> > TenTec at contesting.com
> >> > http://lists.contesting.com/mailman/listinfo/tentec
> >>
> >> _______________________________________________
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> >>
> >
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