[Hammarlund] SP-600 JLX-15 vlf rcvr - NOT!

[James A. (Andy) Moorer]

I don't know anything about this receiver - I have a general comment on 
crystals for lower frequencies:

It is very hard to make a crystal for anything below about 400 kHz. They get 
quite large and easy to get fractures and impurities. Any VLF receiver that 
has slots for crystals is an exercize in wishful thinking. Most crystal 
houses these days won't cut you a crystal below about 700 kHz. JAN has cut 
me some 438 kHz and 472 kHz crystals to replace dead ones in a CV-591A, but 
they did grumble about it (and charged me $3 each more than their normal 
cost).

James A. (Andy) Moorer
www.jamminpower.com

----- Original Message ----- >
>
>> > Hi Ken,
>> > Is AL correct with the JLX-31 being xtal controlled on the vlf band?
>> > My quest goes on for a RBL-3 competitor. bob...w2ami
>>
>> First of all, we must get this completely clear. The subject receiver,
> the
>> SP-600-JLX-15 is NOT, repeat NOT, a "vlf receiver", period. It covers
>> SOME OF the 30 through 300 Khz LF band, but not all of it. It covers
>> NO VLF frequencies at all.
>>