From: Ron Wagner 
Subject: Re: [drakelist] Expensive R-4C


Ron Wagner  made an utterence to the drakelist gang
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This discussion makes me wonder.  How "bad" is the R4B and TR7 vs say a 
modified up R4C?  I know that I have read about the R4C and the close-in 
<5Kc signals with out a roofing filter.  What about the other two?  Is 
there some teaching reading on the web?  Does the passive up conversion on 
the TR7 avoid issues?  I would think that distortion and mixing would be a 
problem any time you do not have a filter to cut the signals before you 
hit an amplifier and or mixer.

I have been hamming for over 25 years, and honestly do not understand all 
the numbers, but would like a better understanding.

>> Agreed. Without getting into too much technical speak, the R-4C lends 
>> itself to becoming a top-notch "competition grade"
receiver. With the 
>> proper roofing filter and the mixer mods, etc., this rig will hear stuff 
>> that many modern rigs won't. The dynamic range is even up there with the 
>> Yaesu FT-1000 series.

And speaking of R4B mods, how good of an idea is the crystal filter mod? 
The one where you sacrifice a T4XB for a IF can and xtal filters.  Is it 
worth getting a basket case T4XB to perform the addition?  Was thinking Al 
Parker has spoken of this mod before.  I have a copy of the doc, but have 
never gone any further.

> I think I will invest the money instead in TLC for my B line - any

73,
Ron
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