[Milsurplus] 94-5 Receiver

[Jim Karlow via Milsurplus]

Hello Hue and Dave - Actually I still have the Japanese 94-5 system I used at the Dayton Hamvention that is shown in Ray's pictures. I'll have to look, but I believe I still have the US Signal Corps TB on setting up, operating and servicing captured Japanese radio equipment that was given to me by Bill Howard, before his passing. Bill was also a big help to me in getting the system working. I used a 1.5 volt D cell battery for the filaments (note that the filament voltage was adjusted to 1 volt using the filament voltage control on the front of the receiver). I used 10 of the 9 volt transistor radio batteries in series for the B+ voltage. (Note - Must check to make sure that there are no shorts on the B+ in the receiver to avoid burning out the fine wire on the inter-stage transformers. I used a high impedance (2000 ohm) headset. The receiver is regenerative and with the regeneration control set properly the performance is amazing for a receiver designed in the 1930s. The transmitter is also a decent performer. The 1 tube design works either VFO or crystal controlled on AM or CW. The hand-cranked generator that was made for the 94-5 radio was used to power the transmitter. As I was concerned at the time that I might not be close enough to frequency to check into the Dayton Hamvention 3885KHz old military radio net that year, I did use a 3885 KHz transmit crystal originally designed for a BC-611 walkie talkie. I modified a small block of wood with two copper plates to an FT243 socket to get it to work with the 94-5 transmitter crystal socket to connect the crystal and withdraw the shorting bar enabling the VFO.  By the way, I had the pleasure of having Fumio Miyato, distinguished Japanese Ham and Surplus Dealer do the cranking of the generator when I was operating  Dave - Good luck with your unit and I'll scan in and send the Signal Corps TB as soon as I can find it. Jim KarlowKA8TUR    
      From: Hue Miller <kargo_cult at msn.com>
 To: "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net> 
 Sent: Wednesday, June 24, 2015 4:43 PM
 Subject: [Milsurplus] 94-5 Receiver
   
Dave-It's hard for me to keep those numbers straight. 94-3, 95-4, 94-5....I had to look it up.http://staff.salisbury.edu/~rafantini/Dayton%20Hamvention.htm  has some photos i recognized.Thanks to Ray Fantini for the photos there.Dave, it says KA8TUR operated it. Maybe he has a redrawn schematic of the thing. I have only the1/2 baseball card sized schematic, suitable for reading with a microscope.BTW, Allen Douglas in past years did some kind of reprint of the ( Japanese ) manual, whichhe most kindly sent me - and - it's the most useless manual i have ever seen in my life. Nopractical circuit information, no schematic. I probably/ possibly will get around to redrawing the schematic "sometime" in my upcomingretirement, but KA8TUR may have done the task already. If you find it so, i would like to get acopy also. It had occurred to me to possibly increase the top freq to 40M by maybe tapping the coilsdown just a bit.But that reminds me - K6DB ( S.K. ) did an article on this radio
  set for E-R a few years back.
I don't recall if the article showed the schematic - if you've not seen that, might be worth looking into.I am wondering exactly how KA8TUR modified his FT-243s to fit into the 94-5 domino-stylecrystals holder.-Hue                          
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