Panadaptors for the R390 page 7
Subject: Re: [R-390] Panadapters
Barry Williams wrote:
> Also, there was a very interesting post from either this group or
> Boatanchors about which point to tap into on the 390A for a 1 mHz wide
> signal to a panadapter, and advice on capacitance on the input line to the
> analyzer.
You can't see a full 1 MHz at 455 KHz so if you're using a 455 KHz panadaptor you'll
only get 30-50 Khz or so. Just wrap a little bit of wire around the plate pin of the 3rd
6C4 mixer (the one that feeds the IF strip, I don't have the tube designation handy). Put a
0.01 600V blocking cap and 47K resistor in series with it and feed it out through coax to
your panadaptor. I use a Singer SA-8B and it works very well. Panadaptors have their
own specs regarding capacitance at the input - it's usually part of a tuning network so the
length of coax may be important. From the point of view of the R-390A you want to
isolate it and keep the effect of cable capacitance as low as possible, hence the resistor. If
you want to look at a full 1 MHz you'll have to get the 2-3 MHz signal before the 3rd
mixer (ie: before the PTO signal is mixed with it) and use either a special panadaptor (I
don't know if such a beast exists for the R-390A - the RA-66 panadaptor for the Racal
RA-17 works that way but it's more complicated than the receiver itself!) or a spectrum
analyzer.
-------------------------------------------------------------------------------------------------------
Date: Sun, 04 Mar 2001 13:41:50 -0600
Subject: [R-390] BC-1031A Panoramic Adapter
Happened to come into possession of one of these in pretty decent condition. Does
anybody know any details on it? I saw a website photo with one sitting on top of an R-
390A, which according to the site owner worked great with it. Another bit of web info,
however, claimed it used an IF input of 400 kHz, which makes me wonder about the first
website. Interesting and businesslike
looking piece of equipment, has "MFP 1953" stamped in a red triangle on the front panel,
CRT engravings show 200 khz bandwidth, but maybe that's adjustable. Single SO-239 on
the back. Does anybody know the straight skinny on this thing, particularly what IF's it
will and won't work with?
-----------------------------------------------------------------------------------------------------------
Date: Tue, 10 Jun 2003 08:05:39 -0400
Subject: [R-390] Coil forms
I have a Heath SB-620 panadaptor set up for a 3395 kc IF. I finally found a description
for the coils needed for a 455kc. IF. conversion. Does anyone know of a source for 1/4
inch slug tuned coil forms?
----------------------------------------------------------------------------------------------------------
(41 Seiten)
(109 Seiten)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern