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Panadaptors for the R390 page 1

PANADAPTOR FOR THE R-390

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Date: Mon, 16 Mar 1998 03:25:40 -0500

From: "Thomas A. Adams" <[email protected]>

Subject: [R-390] Panadaptors and the R-390

Besides the APA-10 panadaptor you mention, WW2 also produced the BC-1031

panadaptor. I've been using one of these for quite some time with a suitably modified SP-

600 with considerable success. I haven't tried to use it with any of my R-390s, because I

find the radio to be somewhat awkward for this type of work; you could get carpel tunnel

syndrome VERY quickly if you tried a lot of cruising.

This situation will be changing in the future tho; I have two Singer panadaptor heads (from

SSB signal analysis consoles) in my garage that are more suitable for the R-390 than the

BC-1031. For one thing, the Singers are rack mounted, and the same shade of grey as the

R-390. For another, the design of the Singer panadaptor IF is somewhat more

sophisticated, and designed to give a much higher resolution than the BC-1031 ( VERY

narrow crystal filters used for interstage coupling ). The only problem is that I have to

change the IF input on them ( they're meant for 1.5 MHz ), and I need to build a suitable

power supply ( unfortunately, the supplies weren't available when I got them ).

The BC-1031 is for a 455 KHz IF, and is designed for a maximum spread of +/- 50 KHz.

There is a Navy version of the unit, listed under their own peculiar nomenclature system,

which is virtually identical but rather amazingly is calibrated for +/- 100 KHz! Given the

constraints of receiver front end bandwidths, I have to take the Navy version with a grain

of salt; a receiver that will pass usable signals for the panadaptor would be pretty

miserable for any OTHER purpose!

The panadaptor is (to me, anyway) a very useful gadget. Besides watching large band

segments for activity, analysis of individual signals in narrow bandwidth sweeps is quite

informative. Multiplex / kineplex transmissions are easily picked apart (useful to me

because I monitor RTTY and similar modes, and it's useful to know exactly which

channels in a given multiplex stack are active, and which are just idling ).

Something I've found VERY interesting is using the panadaptor to pick apart the jamming

signals that are common on the international broadcast bands. Looking at how they're put

together, and making educated assumptions about who is doing the jamming, it's possible

to get a handle on just what schemes various international powers use; this gives you a

knowledge basis for figuring out who the unknown jammers are in cases you encounter

later. The assortment of jamming signal compositions is amazing; AM versus FM versus

suppressed carrier systems, random noise versus repetitive pattern noise modulation, fixed

frequency versus limited bandwidth frequency hopping or sliding modes, etc.

BTW, FYI.... The WW2 vintage APA10 that you mention, like the BC-1031, was

intended to be used with a number of different receiving sets; I know for a fact that it was

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Panadaptors for the R390 page 1PANADAPTOR FOR THE R-390-----------------------------------------------------------------------------------------------

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Panadaptors for the R390 page 10complement is at the lowest pitch. (In other words, the "hiss"...). Check several times,then you will tight

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Panadaptors for the R390 page 11dating back to the late forties.. May I add at this point; It seems that some are not willingto become used to the so

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Panadaptors for the R390 page 12> The problem with using the IF output ... <snip>True, but a YO-301 is not a panadapter, it's a monitor

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Panadaptors for the R390 page 2intended for airborne use with the Hallicrafters built ARR-7, a repackaged and modifiedversion of the SX-28 Super Skyr

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Panadaptors for the R390 page 3That's quite true, and especially in the light of the understated manual. Typically they givea laconic instruction

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Panadaptors for the R390 page 4finally took a deep breath and gave the scope the smoke test. It powers up fine and thecontrols all work as they should

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Panadaptors for the R390 page 5Has anyone made such a tap for a Panadaptor? Where is the best place to go in there andget some full width sig? What&

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Panadaptors for the R390 page 6-----------------------------------------------------------------------------------------------------------------------

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Panadaptors for the R390 page 7Subject: Re: [R-390] PanadaptersBarry Williams wrote:> Also, there was a very interesting post from either this grou

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Panadaptors for the R390 page 8---------------------------------------------------------------------------------------------------------Date: Tue, 10

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Panadaptors for the R390 page 9limitation in the SB-620 with the 455 kHz IF, but I forget what it is at this moment. Ithink it is 1 mHz. Still useful

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