Category Archives: Vintage Radio

Very Scarce Kneisner + Doering KWZ-30 DSP Receiver Surfaces on Ebay

Hailing from Germany, the KWZ-30 communications receiver was one of the first DSP receivers available. This collectable and high performance receiver is rarely seen for sale, but one is now available for a $1890.00 Buy-It-Now price from a Russian Ebay seller. Even with the few dings visible on the radio’s case, it’s likely worth the asking price to a collector.

The extensive Fenu-Radio web site has a nice capsule review of the KWZ-30, including some excellent photos.

At the $1890.00 price of this KWZ-30, you could buy a dozen SDRPlay receivers, or roughly a couple of the highly rated Perseus SDRs. Assuming available funds, is the KWZ-30 a receiver you would add to your radio shack? If so, why… or why not?

Guy Atkins is a Sr. Graphic Designer for T-Mobile and lives near Seattle, Washington. He’s a regular contributor to the SWLing Post.

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Tubes and Valves: Dan’s research uncovers three vintage films

eBay: Dan spots a rare Drake RR3/R4245

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Many thanks to SWLing Post reader, Dan Robinson, who writes:

Almost never seen on Ebay, the Drake RR3, otherwise known as the R4245, which is also essentially a Drake R7/A inside a marine style case.

This one has some condition issues, so anyone considering it should ask some thorough questions…

Click here to view on eBay.

Wow–I don’t think I’ve ever seen the Drake RR3/R4245 before. It would certainly be a unique Drake piece to have in the shack.

As Dan mentions, the seller does not offer returns, so you would want to thoroughly research the condition prior to bidding.

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The Kenwood R-1000: A resurgence in popularity?

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Kenwood R-1000 (Source: Universal Radio)

Many thanks to SWLing Post contributor, Dan Robinson, who writes:

The Kenwood R-1000 has been enjoying a resurgence in popularity over the past few years, fueled in part by a positive re-review of the receiver at http://webpages.charter.net/n9ewo2/news.html

While new condition R-1000s, and you would be surprised how many of them are out there, have gone for $400, few have gone for as much as this one did [$451 US shipped]:

Click here to view on eBay.

My appreciation for this radio has only grown since acquiring it last year. Mine was in like new condition and I had it modified by KIWA to provide multiple selectivity positions.

Click here to search eBay for an R-1000.

Thanks, Dan! I think the R-1000 is a handsome rig and certainly represents everything I love about solid state receivers of the era: simple design, beautiful audio, admirable performance and a proper weighted tuning knob.

Note that if you’re an owner of the R-1000–or any receiver of a similar age–you should set aside a budget for the occasional repair. With regular maintenance, these receivers will give you decades of good DX.

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The Nems-Clarke 1510A: another rare receiver

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Many thanks to SWLing Post contributor, Dan Robinson, who notes:

The amazing streak of rare radios, never before seen on Ebay or rarely seen there, continues, with the appearance of this Nems-Clarke 1510A receiver.

I attempted to find this radio in the Osterman guide to no avail — it’s not in there, unless I missed it. There are a few informational pages about Nems Clarke on the Internet (see below):

Click here to view on eBay.

http://www.dxing.com/r390/other.htm

http://militaryradio.com/spyradio/intercept.html

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Luke considers the Panasonic RF-9000 an investment and solid performer

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In response to our post about a Panasonic RF-9000 being offered on eBay for $20,000(!), SWLing Post reader, Luke, comments:

I actually just bought a RF-9000 from a Spanish Ebay seller. It might show up in the ‘completed auctions’, not sure. I made an offer of 2,000 Euros and he accepted. Of course I am like most of you who might have seen one in a magazine or book for over 20 years, but never dreamed of actually owning one.

My unit had a few imperfections like a couple of dings and the grille was not 100% with some slight discoloration but I cleaned it up nicely and got some Testors paint to fill in the dings. It came with the cover but with no documentation. Everything works perfectly and there are no dirty or inoperable switches or buttons. Even the lights all work which is a relief.

I can only really compare it to the Sony ICF-2010 and the Satellit 700, both of which I have owned at one time. I still have the Sony. The Panasonic is on a much different level as far as ease of use. And the tuning is super fast with absolutely no audio lag between channels if that is the right description. It is really smooth sailing all the way across the dial and you can go straight from FM into the LW band which is pretty cool.

Another nice feature is the band selection buttons actually have the corresponding frequencies also so there is no guesswork. The odd thing about the unit is that all of those cool buttons that you see pertain mainly to the clock and timer functions.

The shortwave side is fairly stripped down with just a 3-way bandwidth selector, a switch for a noise blanker, a RF gain knob, and a 4 position switch for USB, LSB, etc. That is pretty much it for tuning and knob twiddling and I would had preferred to have a few more knobs for antenna trim and other features to eek out faint signals. I guess I was expecting more I don’t know?

I personally find it to be the best radio I have ever used as far as audio and ease of use. I did some side by side tests against the ICF-2010 for sensitivity and it is about a wash. But for 1/10 the price the Sony wins all day long and you cant beat the sync detector! I find myself amazed that I would ever own a RF-9000 and consider it a great investment. I think this seller is dreaming if he thinks he can get that price for it though.

Thanks for sharing your review of the RF-9000! You certainly have a rare and classy receiver that actually performs–a keeper for sure. If I recall correctly, even the tuning knob feels perfectly weighted on the ‘9000.

Based on what these sell for, I don’t think you overpaid for your ‘9000–indeed, you got it at a bit of a discount.

Click here to search eBay for the Panasonic RF-9000.

Click here to view the RF-9000 at Universal Radio.

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Bob recalls working at Harris and putting the RF-505A on the air

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In response to our post mentioning the Harris RF-505A, SWLing Post contributor, Bob LaRose (W6ACU), writes:

I know the RF-505A very well. It was introduced in about 1969 while I worked at Harris in Rochester. I started working there as a Co-Op student while at RIT and then after I got my BSEE I joined them full time, initially as a Field Engineer but quickly found my way into Marketing and eventually Sales.

Right after the first version came out, the RF-505, I took one home to my parent’s house for a weekend and did some SWLing with it. It was very neat in one respect – it tuned ISB (Independent Side Band) and in those days there were a number of utility stations using ISB (separate traffic on each sideband). To an SWL some of the most interesting of these were the VOA point-to-point links from the East and West Coast, each carrying two simultaneous program feeds for the overseas relay stations!

While overall a good receiver my personal results on the sensitivity of the original RF-505 were not very positive. On the bench with exactly a 50 ohm source it looked good but on a real world antenna it was pretty numb. Eventually, after a lot of internal arguments, they came out with the RF-505A that included a tunable active preselector as shown in the photos. Problem solved.

For a ham or SWL the RF-505 was a real pain in the butt to tune. You could dial in any exact frequency but the decade switches didn’t roll over (either mechanically or electrically) so you had to do a lot of knob twiddling to do any kind of band scanning. The detents on the switches connected to the knobs were pretty stiff so you could easily take some finger skin off tuning around!

If I remember correctly Harris built them for about a five year period and then replaced them with the RF-550, which was a monster of a receiver with all kinds of advanced features. It included a keyboard with electronic display.

Great memories!

Thanks so much for this RF-505A insight, Bob! I had a hunch that band-scanning wasn’t the RF-505A’s strong suit–it would be incredibly cumbersome to scan with so much “knob twiddling.”

It must have been pretty amazing to work for the legendary Harris corporation. Thanks for sharing!

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