[Boatanchors] Re: Collins R-388 vs 51J4

[Bill Cotter]

Robert,

Examining the 51J4 schematic on the CCA site, the 51J4 uses the 
identical Hi-Z input design as the R-388 and 51J3 use.

http://www.collinsradio.org/51J-4-_4th-ed-09-58_-Sec7.pdf

I don't see the difference you are referring to regarding Lo-Z and 
well-healed civilians.

73 bill n4lg



At 12:03 AM 10/3/2007, you wrote:
>Actually, the R-388 wasn't a hacked up design (and it isn't a 
>51J-4).  The
>51J was "proper" only if you wanted to use it with a Lo-Z 
>source.  It was built
>to sell to well healed civilians who couldn't imagine any antenna 
>other than a
>coax center fed dipole.  The R-388 wasn't.  There is nothing 
>improper about
>designing a radio to work as intended.  The input of the R-388 is 
>proper
>because that's what it's only customer wanted, needed, ordered, 
>and most importantly
>to Collins Radio paid for.  It was built to use in the later model
>AN/GRC-26's, not in some high-end suburban neighborhood.  And it 
>works just fine with
>the end fed wire mine is tied to.
>
>In a message dated 10/2/2007 10:03:10 PM Central Daylight Time,
>ai2q at roadrunner.com writes:
> > >The fact of the matter is that the R-388 and 51J-4 are hacked 
> up designs.
> > >The original 51J had proper low-impedance windings on the RF 
> coils.  The
> > >later top-coupled scheme was done at the behest of the 
> military to better
> > >accommodate short whips.  The R-390 has both kinds of inputs.
> > >
>
>Robert Downs - Houston
><http://www.wa5cab.com> (Web Store)
>MVPA 9480
><wa5cab at cs.com> (Primary email)
><wa5cab at comcast.net> (Backup email)
>
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Bill Cotter, N4LG             E-mail: n4alg at qx.net
173 Carolyn Lane               Home: (859) 887-5563
Nicholasville, KY 40356-9340   Work: (859) 323-6474

ARRL   ARCI #9878   QRPl #1646   QCWA #29393   FISTS #4535
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