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

[Garey Barrell]

Jim -

You are correct.   Both are designed to work with a high impedance whip 
or single wire antenna.   Some use a TV receiver balun (nominally 70 to 
300 ohms) as a step-up transformer.  Most are good all the way down to 
the upper BC band.

Actually many boatanchor receivers are happier with a Hi-Z antenna up 
until the late 50's era and benefit from an "antenna input transformer".

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>



N2EY at aol.com wrote:
> In a message dated 9/30/07 9:04:40 PM Eastern Daylight Time, 
> bluebirdtele at embarqmail.com writes:
>
>
>> Are there any important differences between the Collins R-388 and the 
>> Collins 51J4 receivers?
>
>
> I don't know for sure. But I recall reading an Electric Radio article 
> which claimed that the R-388 was designed for high-impedance antenna 
> input, not 50 ohms. The article included modification to add low-Z 
> link inputs.
>
> Never having owned either rx, I can't vouch for that, but might be 
> worth checking out.
>
> 73 de Jim, N2EY
>
>