[Boatanchors] Re: Collins R-388 BCB mods

[AI2Q]

Figure 2B in the referenced .PDF file is incorrect. The anti-resonant 
parallel circuit of Fig. 2B should be in series with the antenna lead, not 
across it.

Vy 73, AI2Q, Alex
ARRL, FOC 1861, QRP-L 687, AWA
http://users.adelphia.net/~alexmm/ai2q.htm


----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: <Boatanchors at mailman.qth.net>
Sent: Monday, October 01, 2007 5:28 PM
Subject: Re: [Boatanchors] Re: Collins R-388 BCB mods


> 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.
>
> Al
>
> DW Holtman wrote:
>> Hello,
>>
>> In my opinion, a lot better way to deal with BCB interference is to build 
>> a high pass filter with a cut off frequency of around 3 MHZ. An excellent 
>> article on this subject is written by Joseph Carr. It can be found at
>>
>> http://www.dxing.com/tnotes/tnote06.pdf
>>
>>