N0WEK
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« on: November 25, 2008, 11:05:26 PM » |
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I bought this thing on Ebay. It looks like some partially built older project with a pile of meters and a four 832s. Does anyone recognize this project from some old Handbook or have any idea what it was supposed to be? If nothing else it's a good start on something or a lot of great parts. Good pictures here... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=160299579654Greg |
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Diesel boats and tube gear forever!
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Opcom
Patrick J. / KD5OEI
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« Reply #1 on: November 26, 2008, 01:19:55 AM » |
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what in the world.. I don't see any tanks but they could be above the tubes out of sight. Nicely made and a value for the price! I wonder if it is some kind of pulse generator power stage? too wierd.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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ab3al
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« Reply #2 on: November 26, 2008, 07:03:21 AM » |
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flux capacitor ??
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K3ZS
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« Reply #3 on: November 26, 2008, 09:42:50 AM » |
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Looks like a balanced something from the front panel layout.
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W9GT
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Nipper - Manager of K9 Affairs
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« Reply #4 on: November 26, 2008, 12:06:27 PM » |
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Looks like a vintage VHF rig. What is the xtal freq? You might be able to figure out what the operating freq was by multiplying the fundemental freq by different multiples and see what you come up with. 832s are dual tetrodes, I believe. Kinda like lower power versions of 829Bs. Nice parts rig anyway.
73, Jack, W9GT
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Tubes and Black Wrinkle Rule!!
73, Jack, W9GT
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N0WEK
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« Reply #5 on: November 26, 2008, 12:37:04 PM » |
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From what I can see in the pictures, it looks like the xtal is 28202 khz which might make it a 10 meter rig or if doubled twice would put it in the old WWII 2 1/2 meter band, which is now right in the middle of the vhf aircraft allocation.
When I get it I'll take better pictures and work up a schematic and see what's there.
The two lower knobs seem to have extensions that line up with a couple of holes in the lower chassis. Interesting to see what might mount there.
I do have some 829s in stock too!
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Diesel boats and tube gear forever!
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KB5MD
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« Reply #7 on: November 27, 2008, 09:49:51 AM » |
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Since you out bid me and got the thing, I'm not going to tell you what it is! But, it is definitely one of those.  Have fun with it. |
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W1ATR
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« Reply #8 on: November 27, 2008, 08:40:22 PM » |
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You don't want to know what that is. Just a useless pile of junk. Wanna sell it.  |
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N0WEK
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« Reply #9 on: December 06, 2008, 12:20:17 PM » |
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The transmitter showed up in good shape.
I haven't drawn out the schematic but it looks like it's really two identical transmitters side by side. The oscillator plugs into an octal socket and has a 24.212 xtal in it which triples up to 72.636 and then doubles up to 145.272. As far as I can tell with a quick look it's oscillator and two push pull 832s and then link coupled to the antenna connector. The covers and link/ant connector is missing from one side and the oscillator is missing from the other. Power supply and modulator would be fed in from the sockets on the back.
I guess it'd be one way to be frequency agile.
It's very professional work.
I may try to put it on the air.
Still no ideas about who built it or from what plans, if any?
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Diesel boats and tube gear forever!
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KA2PYQ
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« Reply #10 on: December 06, 2008, 01:49:09 PM » |
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If it`s two transmitters side by side maybe you could up
the ante. Shunt the meters, put 4 3X2500A3 triodes in 4
inside corners with blowers and vacuum variables, build
an exciter beneath and 4 modulators and so on. "AM JAM
BOREE. Swimsuit optional but your transmitter must be
on AM.". -Floyd Dunlap, late WA5TWF.
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WU2D
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CW is just a narrower version of AM
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« Reply #11 on: December 10, 2008, 06:07:42 PM » |
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Nice shielded and balanced construction - No 1950's TVI here OM!
Those 832s make good triplers and they were certainly made by the boat load for the SCR-522's VHF ARC-5's etc..
They are still regarded as pretty much tube fodder at hamfests but if you drag some home, be careful where you sit.
You might be able to get 15 Watts out of an 832 on 2M. I converted an SCR-522 transmitter and swapped out the 832 for an 829B by shimming the socket and got 25 Watts out on 2M AM.
Mike WU2D
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These are the good old days of AM
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