[SignalOne] CX7 serial numbers

Mon Dec 26 15:49:19 EST 2016

Hi Dale,

As usual we had bad weather so I could not  operate very much in the 
contest this year. Late fall and winter at 65.4N is not good for 
large EME arrays so I keep them parked most of the time.

Meanwhile spending my time working on not-so-modern top class radios. 
My Multi Elmac AF-67 still doing the honors on 80m AM.

A quick test this afternoon told me that the CX7 sounds powerful on 
AM with the ElectroVoice 676 microphone. Need to investigate this 
mode on the CX7 a little further though. The manual says that the 
carrier should be set at 35 watts and that the meter should kick up 
to 75 watts when modulating on AM. I was only running about 15 watts 
carrier when testing AM this afternoon, it sounded fine though.

73
Peter SM2CEW

At 20:29 2016-12-26, Dale Parfitt wrote:
>Hi Peter,
>Surprised to see  you on the Signal One list. Missed you on 23cM EME on the
>2nd leg of the contest.
>Hope to work you again soon,
>
>Dale W4OP
>
>-----Original Message-----
>From: SignalOne [mailto:signalone-bounces at mailman.qth.net] On Behalf Of
>Peter Sundberg
>Sent: Monday, December 26, 2016 3:21 PM
>To: Fred; signalone at mailman.qth.net
>Subject: Re: [SignalOne] CX7 serial numbers
>
>
>
>This list is for discussions regarding collecting, repair, use and sale of
>Signal/One radios and accessories.
>
>Documentation on Signal/One radios can be found at http://www.hamanuals.com
>and several other sites on the Web.
>
>.
>Thanks for the info guys, all very interesting and much appreciated.
>
>My CX7 labels says serial number 00119 and the label says it is manufactured
>in FLA. It still has the NIXIE-tube display, all digits working fine.
>
>I have only inspected it briefly inside when blowing the dust out with high
>pressure air. I see what appears to be modifications to some of the circuits
>but I need to back track them to see what they really are. Doing so I will
>take pictures and put them on my webpage, I will also send some info and
>pictures to you Fred for the registry page.
>
>I have been checking the webpages you are pointing to so I am familiar with
>all the material available and will digest all of it in due time.
>
>At the moment I have a fair idea who brought this set with him to Sweden
>from the US in the 70's, I just need to do some more checking to verify
>this. If this turns out to be true, I actually operated this set briefly in
>a contest in 1977. I did not wash my hands for a week after that highlight
>in my early ham career... :-)
>
>73
>Peter SM2CEW
>
>
>
>
>At 17:32 2016-12-26, Fred wrote:
> >Hi Peter and Hi also to you Ed.
> >Happy New Year!
> >I sent the following in response to another request for SN info recently.
> >It echos what Ed said.  I am going to diligently look for my notes on
> >the SNs and dates of production.  They date back to the early 2000s but
> >I know they are here somewhere. HI HI  It may be  2 or 3 weeks but I
> >will add this info to the web site and alert everyone here when it is
> >done.
> >
> >As for the serial numbers here is what we know.  And I am doing this
> >from memory as I thought I had this info on the web site but I do not.
> >I have the notes around here somewhere but it could take quite a while
> >to find them.  I will do it after the first as this information should
> >be posted.  So I hope my memory serves me well and the following info
> >is correct.
> >The FL rigs had 5 digit SNs starting at 00100 or 00101 (not certain).
> >The CA rigs had 9 and 10 digit SNs and to this day we can't figure out
> >what the hell they were doing.  There is no logical pattern to the
> >numbers.
> >The CA rigs were certainly CX7As but actually there were some of the
> >later FL rigs that had most of the updates in them.  So it is difficult
> >to say that at a certain SN they actually became CX7As.  There were
> >also a very few rigs with SNs 71-xxx.  I can't remember why right now.
> >Most of the radios have had many if not all of the A mods and most have
> >also had the IC power supply upgrade done.  The early power
> >supplies....well, they just sucked.  The pass transistors were
> >constantly failing.
> >If you have most of the A mods, as I expect you do, and you have the
> >LED keyer/counter and you have the IC power supply mods then what you
> >have is considered a CX7B.  There were 3 or 4 CX7Bs made in NJ right
> >before the CX11 came out.  The LED board is essentially a CX11 board
> >with a different LED configuration.
> >I have 2 CX7s that I consider to be B models.
> >
> >
> >73 de
> >Fred
> >K5OG
> ><http://www.k5og.com>www.k5og.com
> >www.signalone.org
> >
> >
> >
> >Peter Sundberg wrote:
> >>
> >>
> >>This list is for discussions regarding collecting, repair, use and
> >>sale of Signal/One radios and accessories.
> >>
> >>Documentation on Signal/One radios can be found at
> >><http://www.hamanuals.com>http://www.hamanuals.com and several
> >>other sites on the Web.
> >>
> >>.
> >>Hi all,
> >>
> >>I am new to this group. I have finally acquired a CX7 with the
> >>matching CX7S speaker and the ElectroVoice 676 microphone + service
>manual.
> >>
> >>It took me 40+ years to afford this beauty.. :-)
> >>
> >>I would like to find out if the serial numbers are different
> >>between the CX7 and CX7A?
> >>
> >>Reading the K5OG registry I see low numbers both for the CX7 and
> >>the CX7A, so just curious if they are the same or separate series.
> >>
> >>73
> >>Peter SM2CEW
> >><http://www.sm2cew.com>www.sm2cew.com
> >>
> >>
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