399B-2 export version shown. Image: hamandhifi.com
Name/Title
** Collins 388B-1, 399B-2
Description
DX Adapter for use with KWM-1
Category
Other
Made/Created
Manufacturer
Collins Radio Company
General Notes
Note
Because the KWM-1 was a transceiver, it normally locked the transmiter and receiver to the same frequency. This was a headache for DX chasers in the late 1950s. Foreign DX stations would often transmit in the "foreign" portion of the 20-meter phone band and announce they were listening for American stations way up in the US phone band.
The 399B-1 DX Adapter permits the VOX circuits to transfer the transmit section of the KWM-1 to crystal control within the American phone band (the desired crystal may be plugged into the plug-in unit) while the receive sections are tuned into the foreign DX band. The crystal plug-in unit contains two transmit cyrstals and one receive crystal with provision for five additional transmit crystals. Transmit crystals are furnished for operation at 14.293 and 14.296 mc and the receive crystal is for operation from 14.250 to 14.350 mc.
The 399B-2 export version of the DX Adapter is furnished with transmit crystals for operation at 14.303 and 14.306 mc and receive crystal for 14.250 to 14.350 mc. Transfer operation is accomplished automatically by relays and crystals included in the adapter.
