Re: [IRCA] Tuning 1-KHz (resend)

[Charles A Taylor <MWDXer@xxxxxxx>]

Here's a "resend," with (I hope) the lines lining up. Somewhere along
the line, one of the lines of text that I send keeps getting moved
one space back or forth. BLAH!

At 09:45 PM 5/6/2007 -0400, you wrote:
>At 07:43 PM 5/6/2007 -0400, you wrote:
> >Hi Charles,
> >
> >Yeah I did, I've been using the 1 KHz filter for that, I'll try your
> >method and let you know how it works for me, thanks.
> >I find that most people don't really differentiate between 390's and
> >390A's especially if they don't own them, that's part of the reason why I
> >assumed Patrick meant a 390A, also in private correspondance he 
> mentioned an A,
> >
> >Bob
>
>Bob,
>
>The 1-KC bandwidth is too "tight" for AM work, in my opinion, It
>precludes being able to hear 2 and 3-kHz voice components which
>are very helpful...maybe essential, for intelligibility.
>
>
>                  ________
>                  |   2   |
>                  |  kHz  |
>  ________________|       |__________
>
>-----------------------------------
>1510            1520            1530
>    |               |  |            |
>                       |
>                     1521
>
>Above is how I think you're tuning BKBSA-1521. The 2-kHz
>passband centers on 1521. As you can see, 1520 carriers
>are going to be audible as they are inside the passband.
>
>
>
>
>                     ________
>                     |   2   |
>                     |  kHz  |
>     ________________|       |__________
>
>-----------------------------------
>1510            1520            1530
>    |               |  |            |
>                       |
>                     1521
>
>Above, you've "slid" the R-390As frequency up so that it
>reads something like "1522" on the dial. 1520 carriers
>are outside the passband.
>
>In slowly tuning across 1520 upwards, you should note
>that the 1521 het appears rather abruptly, As you
>continue to tune upward, the het should disappear
>abruptly. That's the sharp-sided shape factor of the
>R-390A mechanical filters working. The R-390 doesn't
>have that shape factor.
>
>As a matter of fact, the 1-kHz passband is shaped more
>like a sinewave. Only a crystal lattice filter
>replicates the shape factor of the mechanical filter.
>
>Cheers!
>
>Chaz-O
>
>
>Charles A Taylor, WD4INP
>Greenville, North Carolina
>
>
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Charles A Taylor, WD4INP
Greenville, North Carolina 


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