More info on the International Crystal Model 1500 CB radio

 I was searching my old emails and found one from Mark Langenfeld in 2015.  Mark had kindly provided a copy of the International Crystal Model 1500 brochure which is reproduced here:

Some interesting information in the brochure:  the receiver was similar to the Executive 100a with the addition of circuits (BFO, sidetone) for CW.  Also a Nuvistor grounded grid pre-amp was used at the antenna.  Finally the transmitter is run at low plate voltage of 22 volts.  It looks like quite an over-engineered rig which may be why it was so expensive.

Mark also mentioned an article in the December 1961 issue of Popular Electronics magazine:

https://worldradiohistory.com/Archive-Poptronics/60s/61/Pop-1961-12.pdf

This was a construction article for a Part 15 project called:  "The Roof Hopper" on page 47.  A 100 mW transistor oscillator using CB crystals remotely operated with a indoor AM modulator.   Part 15 regulations called for a maximum antenna length of 5 feet in 1961.  As I understand it the current version of Part 15 allows an antenna length of up to 3 meters.

The Roof Hopper is similar in concept to the International Crystal model 1500 (transmitter at the antenna) but much less complex.  Also the Roof Hopper is a transmitter only and is solid state.   The International Crystal model 1500 was a tube rig and did include a fairly elaborate receiver with a crystal filter.

Anyway, the Roof Hopper looks like fun AND CB crystals are still sold on Ebay :)

I would like to see the manual / schematic for the International Crystal model 1500, the actual rig would also be neat to see, at least in photographs.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm