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

[Al Parker]

Hi guys,
    I'm on teh way to bed - but -- if I said that I sure didn't mean it.
more tmw,
Al
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: "RJ Mattson" <rjmattson at hvi.net>
Cc: <Hammarlund at mailman.qth.net>
Sent: Wednesday, July 19, 2006 9:59 PM
Subject: Re: [Hammarlund] SP-600 JLX-15 vlf rcvr - NOT!


> > 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.
>
> Secondly, in the answer to your question as to whether or not the  JLX-
> 31 is crystal-controlled on "the vlf band".  It may be. I've never had
one.
> The letter "X" in the nomenclature would certainly indicate that the
JLX-
> 31 has PROVISION for some crystal controlled channels, and the "L"
> would indicate to me that it has some LF capability. But what that is, I
> do not know.
>
> However, when you say "in the vlf band" you had better make perfectly
> clear what you mean by that. In point of fact VLF means ONLY
> frequencies from about 10 to about 30 Khz, the bands between 30 and
> 300 Khz are LF, the bands between 300 Khz and 3.0 Mhz are
> considered MF, and 3 to 30 Mhz is called HF.
>
> There is no single "vlf band" that covers from 10 Khz through something
> more than 30 Khz.
>
> Now, I repeat, and this is a very important distinction:
>
> The SP-600-JLX-31 is NOT, repeat NOT,
> the same receiver as the SP-600-VLF-31 !!!!!!!!!!!
>
> Not by a long shot!
>
> As I understand it, the SP-600-JLX-31 is simply one in a long line of HF
> band, or combined some-bit-of LF and HF band receivers.
>
> The SP-600-VLF-31 is a COMPLETELY different design, having
> different IF frequencies, and totally different main frequency coverage.
>
> The SP-600-VLF-31 continuously covers 10 Khz through 1500 Khz in
> seven bands.
>
> The ONLY thing they have in common in the nomenclature is the
> number "31" at the end. They are COMPLETELY DIFFERENT
> RECEIVERS, period.
>
> There are several receivers that would be a significant upgrade to your
> RBL-3 (of which I have several, BTW). They are the SP-600-VLF-31,
> the RCA SRR-11, the National AN/WRR-3, the Collins R-389, and
> several others more difficult to find.
>
> As of now, I have several each of the RAK, RBL, SRR-11, and one R-
> 389. I had to sell all three of my SP-600-VLF-31s, so I have no more of
> those, and I have never had an AN/WRR-3, although there is one for
> sale now on the Milsurplus list.
>
> We absolutely MUST get the distinction between the SP-600-JLX-31, or
> -15, and the SP-600-VLF-31 clear before we can do any more
> discussion on their relative merits. They are NOT the same receiver!
>
> Ken Gordon W7EKB
>
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