[Hammarlund] Hammarlund Digest, Vol 118, Issue 6

Thu Nov 21 14:49:43 EST 2013

miles k2cby

the dero 2f looks 100% like a standard sp-600 vlf and has all the exact same functions.
it uses all ceramic discs so one can assume that dero took standard military issue sp-600 vlf 31's and slapped their own front panel on them. there may or may not be some slight component variations such as resistor or capacitor values. but since only the manual for the standard sp-600 vlf exists (unless some lucky ham has one and hasn't spoken up yet) a comprehensive comparison would be difficult. the only difference I have noticed by looking at pictures of other vlf31s is that the dero uses round transformers instead of octagonal.
  the dero's have engraved front panels that say dero research and development model 2f receiver.
and at the bottom center of the front panel there is a standard sized metal id tag that repeats the model info + contract data and serial number.
I don't have pictures of my set yet but you can see exactly what one looks like if you go to
www.eclipseofthechurch.org/w7ekb/glowbugs/BA/SP600vlf31.html

73s
dave

On Thursday, November 21, 2013 1:17 PM, "hammarlund-request at mailman.qth.net" <hammarlund-request at mailman.qth.net> wrote:

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Today's Topics:

   1. sp600 vlf question ?? (Dave Sampson)
   2. SP-600 VLF Question (k2cby)
   3. Re: sp600 vlf question ?? (Richard Knoppow)
   4. SP-600 JX-14 (Doug Hensley)
   5. Re: SP-600 JX-14 (Bob Young)
   6. Re: SP-600 JX-14 (Richard Knoppow)

----------------------------------------------------------------------

Message: 1
Date: Wed, 20 Nov 2013 13:35:57 -0800 (PST)
From: Dave Sampson <challanger13041 at yahoo.com>
To: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
Subject: [Hammarlund] sp600 vlf question ??
Message-ID:
    <1384983357.72778.YahooMailNeo at web124702.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

hello everybody...I am new to the list
?
I have a dero 2f ...just like an sp-600 vlf.
wonder if anyone knows who dero made them for...fcc, cia, nsa ? and how many may have been made?
?
the only references I could find on the net were for a calculator they made and a legal dispute they were involved in.
?
dero research and development I imagine is long defunct at least by that name. they were located in Huntington ny.
?
there is a dero enterprises inc. headquartered in canada but that has a branch in Bayville ny (only 10 miles away!)
?
I called them, but a man with a heavy foreign accent answered and I think he either got frustrated with me or didn't want to answer my non-profitable questions and he hung up. dero enterprises webpage says that they are into injection molded plastic.
?
that's all I have been able to find so far...not much
?
any ideas ???
thanks
dave n2zwx

------------------------------

Message: 2
Date: Wed, 20 Nov 2013 17:29:49 -0500
From: k2cby <k2cby at optonline.net>
To: hammarlund at mailman.qth.net
Subject: [Hammarlund] SP-600 VLF Question
Message-ID: <DF97F58BD83B423D98ED7AF409EB733A at milesdesk>
Content-Type: text/plain; charset=us-ascii

Can you specify how and where the name "dero" appears? Is it on the original
aluminum front panel or on some sort of subsidiary panel attached to it?
Does the name "Hammarlund" appear at all?

The SP-600 was a workhorse of a receiver and it was adapted by several
contractors to specialized operations. Usually this involved an external
HFO, BFO and/or detector. In those cases, the contractor typically attached
his own name plate over the Crystal-Selector / Crystal-Trimmer section at
the upper right corner of the front panel and left the Hammarlund name plate
at the center.

Is this a "normal" SP-600 VLF? No non-standard tubes, no circuit changes, no
external HFO or BFO?

Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, NY 11963
Tel.: (631) 725-4400

Fax.: (631) 725-2223
e-mail: k2cby at optonline.net 

------------------------------

Message: 3
Date: Wed, 20 Nov 2013 14:50:13 -0800 (GMT-08:00)
From: Richard Knoppow <1oldlens1 at ix.netcom.com>
To: Dave Sampson <challanger13041 at yahoo.com>,
    "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
Subject: Re: [Hammarlund] sp600 vlf question ??
Message-ID:
    <16257597.1384987813530.JavaMail.root at mswamui-cedar.atl.sa.earthlink.net>

Content-Type: text/plain; charset=UTF-8

-----Original Message-----
>From: Dave Sampson <challanger13041 at yahoo.com>
>Sent: Nov 20, 2013 1:35 PM
>To: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
>Subject: [Hammarlund] sp600 vlf question ??
>
>hello everybody...I am new to the list
>?
>I have a dero 2f ...just like an sp-600 vlf.
>wonder if anyone knows who dero made them for...fcc, cia, nsa ? and how many may have been made?
>?
>the only references I could find on the net were for a calculator they made and a legal dispute they were involved in.
>?
>dero research and development I imagine is long defunct at least by that name. they were located in Huntington ny.
>?
>there is a dero enterprises inc. headquartered in canada but that has a branch in Bayville ny (only 10 miles away!)
>?
>I called them, but a man with a heavy foreign accent answered and I think he either got frustrated with me or didn't want to answer my non-profitable questions and he hung up. dero enterprises webpage says that they are into injection molded plastic.
>?
>that's all I have been able to find so far...not much
>?
>any ideas ???
>thanks
>dave n2zwx

     See  http://www.w7ekb.com/glowbugs/BA/SP600VLF31.html

------------------------------

Message: 4
Date: Wed, 20 Nov 2013 20:44:47 -0600
From: Doug Hensley <w5jv at hotmail.com>
To: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
Subject: [Hammarlund] SP-600 JX-14
Message-ID: <COL129-W38DB913BCEA8ED27D3FF6891E10 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"

I have an SP-600 JX-14 that is missing the two 1", black knurled knobs on theupper right of the receiver.  The little small knob down below is non=original.If anyone has these to spare or can suggest a decent substitute, I'd like to hearfrom you.
Playing with it, I see that there is no antenna trim, no "peaking" control. Is thatnormal or is it right in front of me and I don't see it :-) ...
73, Doug

>>>>>>>> ZUI ZEW <<<<<<<<<
See my "For Sale or Trade List" at:  <<  http://www.w5jv.com/  >>

------------------------------

Message: 5
Date: Wed, 20 Nov 2013 21:57:16 -0500
From: Bob Young <bobyoung53 at hotmail.com>
To: Doug Hensley <w5jv at hotmail.com>, "hammarlund at mailman.qth.net"
    <hammarlund at mailman.qth.net>
Subject: Re: [Hammarlund] SP-600 JX-14
Message-ID: <BLU177-W29844140ACF28501FF5B77CCE10 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"

No that's normal Doug, they didn't have one. 

Bob Young
KB1OKL

> From: w5jv at hotmail.com
> To: hammarlund at mailman.qth.net
> Date: Wed, 20 Nov 2013 20:44:47 -0600
> Subject: [Hammarlund] SP-600 JX-14
> 
> I have an SP-600 JX-14 that is missing the two 1", black knurled knobs on theupper right of the receiver.  The little small knob down below is non=original.If anyone has these to spare or can suggest a decent substitute, I'd like to hearfrom you.
> Playing with it, I see that there is no antenna trim, no "peaking" control. Is thatnormal or is it right in front of me and I don't see it :-) ...
> 73, Doug
> 
> 
> >>>>>>>> ZUI ZEW <<<<<<<<<
> See my "For Sale or Trade List" at:  <<  http://www.w5jv.com/  >>
> 
>  
> 
>                            
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------------------------------

Message: 6
Date: Wed, 20 Nov 2013 19:28:16 -0800
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
To: "Doug Hensley" <w5jv at hotmail.com>,    <hammarlund at mailman.qth.net>
Subject: Re: [Hammarlund] SP-600 JX-14
Message-ID: <BAB70CE12A3C425DA43E45BC0A5B85DF at VALUED20606295>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
    reply-type=original

----- Original Message ----- 
From: "Doug Hensley" <w5jv at hotmail.com>
To: <hammarlund at mailman.qth.net>
Sent: Wednesday, November 20, 2013 6:44 PM
Subject: [Hammarlund] SP-600 JX-14

>I have an SP-600 JX-14 that is missing the two 1", black 
>knurled knobs on theupper right of the receiver.  The 
>little small knob down below is non=original.If anyone has 
>these to spare or can suggest a decent substitute, I'd like 
>to hearfrom you.
> Playing with it, I see that there is no antenna trim, no 
> "peaking" control. Is thatnormal or is it right in front 
> of me and I don't see it :-) ...
> 73, Doug
>
>
    No antenna peaking control on this receiver. The 
standard SP-600-JX has two small knurled knobs, about 5/8th 
inch diameter for the fixed crystal oscillator and a shorter 
knob of about 3/4 inch diameter for the dial lock all 
anodized black.  The -17 version has two additional 5/8th 
inch knobs.  Three are anodized red, one black. I don't know 
a source for these but suspect a machinist could make them 
easily.

--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com

------------------------------

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End of Hammarlund Digest, Vol 118, Issue 6
******************************************