464f11d0   
   XPost: rec.radio.shortwave   
   From: bit_bucket@gmx.com   
      
   On 11/10/2011 9:52 PM, rrusston@hotmail.com wrote:   
   >   With the survivalist market as well as the DIYers who would build a   
   > kit I have given thought to the idea of building a new tube shortwave   
   > receiver as a usable, practical set.   
   >   
   >   That means no regens, no DC bullshit, and no plug in coils. It must   
   > have production grade RF and IF coils, a bandswitch, and require   
   > alignment. If sold as a kit the builder will need a RF generator and a   
   > scope (or a spec an or CSM with a track gen).   
   >   
   >   It should use off the shelf parts even if those shelves are bare, as   
   > it is better to copy an existing item than design from scratch. I   
   > would clone the Eddystone dial mechanism and the bandswitch and coils   
   > from some Hallicrafters or Hammarlund set, they could be sold as   
   > desperately needed replacement spares for the old sets too. I would   
   > use a seeing eye tube mounted in a hole in the dial as opposed to a   
   > meter movement, again, getting a run of new tubes made is possible if   
   > you are buying several thousand. There are some surplus that could be   
   > used if really needed too.   
   >   
   >   I would use a separate power supply and speaker for several reasons.   
   >   
   >   I would have the radio take in B+ and heater voltage and put out 600   
   > ohm +4 audio. A regular supply could be used at home or car battery   
   > and a switchmode brick for B+. A headphone jack would be supplied off   
   > this tube.   
   >   
   >   The set should cover 500 kHz to 30 MHz, AM, SSB and CW, with a   
   > product detector of course. A 455 kHz IF is needed so as to use common   
   > mechanical or crystal filters, which are optional. There should also   
   > be a 455 kHz IF out for an external synchronous detector.   
   >   
   > Any other comments?   
      
   Yeah, why would anyone build a survival set whose filaments would burn   
   much more power than a VERY high end transistor set?  You plan on   
   hauling around sq yards of solar cells to power that rig?   
      
   Regards,   
   JS   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)