From: Eric Webner 
Subject: Re: [drakelist] R4B vs R4c


Eric Webner  made an utterence to the drakelist gang
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Glad that Garey is here to straighten me out. Guess I had the filter scheme
backwards. Like I said, listen to the experts.
 
Eric


Garey Barrell  wrote:

Garey Barrell made an utterence to the drakelist gang
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Both the B AND C lines have a "roofing filter" in the first IF. The 
difference is in the second IF, where the B uses L-C filters in the 
Passband Tuner and the C uses crystal filters.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual




Eric Webner wrote:

> Hi Jim,
> 
> Years ago, my college radio club (Case Amateur Radio Club - W8EDU) had 
> both a C-line and a B-line. The C-line was considered the better 
> station. I presently have a C-line and recognize that the performance 
> is much better than the B-line. One thing I know of is that the C uses 
> a crystal filter in the first IF (newer radios call this a "roofing 
> filter.") This goes a long way to increasing the receiver's dynamic 
> range. Operationally, it can hear stations that other radios will 
> never pick up. The B-line uses, I believe, an RC circuit in the first IF.
> 
> I am sure that the experts on the list will have many more 
> comparisions to make for you.
> 
> 73,
> 
> Eric KA8FAN
>
>
> */"James E. Lanier" /* wrote:
>
> I would like to hear from those of you who have used both. What
> are your opinions?
> 
> 1) Electrical Performance Comparisons
> 
> 2) Mechanical performance (PTO tuning etc.)
> 
> Thanks,
> 
> Jim N4BPM
>
> ------------------------------------------------------------------------

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Glad that Garey is here to straighten me out. Guess I had the
filter scheme backwards. Like I said, listen to the experts.
 
Eric
Garey Barrell
<k4oah{at}mindspring.com> wrote:
Garey Barrell
made an utterence to the drakelist
gang----------------------------------------------------------------------Both
the B AND C lines have a "roofing filter" in the first IF. The
difference is in the second IF, where the B uses L-C filters in
the Passband Tuner and the C uses crystal
filters.73, Garey -
K4OAHAtlantaDrake C-Line Service
Manual<HTTP: R-4C_Servicez hr99.home.mindspring.com
/>Eric Webner
wrote:> Hi Jim,>
> Years ago, my college radio club (Case Amateur Radio
Club - W8EDU) had > both a C-line and a B-line. The C-line
was considered the better > station. I presently have a
C-line and recognize that the performance > is much better
than the B-line. One thing I know of is that the C uses >
a crystal filter in the first IF !
(newer
 radios call this a "roofing > filter.") This
goes a long way to increasing the receiver's dynamic >
range. Operationally, it can hear stations that other radios will
> never pick up. The B-line uses, I believe, an RC circuit
in the first IF.> > I am sure that the
experts 
---