[Boatanchors] Demagnitization device (Re: Boatanchors Digest, Vol 73, Issue 2)

Tue Feb 2 17:55:45 EST 2010

Hi
I use an old metal-encapsulated TV deflection coil  as demagnitization tool.
I apply ac to coil and insert the item to be de-magnitized into the center 
of the coil.

----- Original Message ----- 
From: <boatanchors-request at mailman.qth.net>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, February 02, 2010 6:00 PM
Subject: Boatanchors Digest, Vol 73, Issue 2

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> Today's Topics:
>
>   1. Relay Repair - Demagnetization Question (Greg Mijal)
>   2. test equipment FS + spectrum analyzer (Dave Meitzen)
>   3. Classic Exchange Contest (CW) (Mark K3MSB)
>   4. New Bern Radio Club Auction February 6th (Greg Mijal)
>   5. NEW BERN NC RADIO CLUB AUCTION FEB 6TH (Greg Mijal)
>   6. WTB: 12.6 vac @ 5-6 amp filament transformer (Greg Mijal)
>   7. SSB Filter 6.4 MHZ (Keith Densmore)
>   8. F.S.7360 TUBE NOS (k2sse)
>   9. Re: Relay Repair - Demagnetization Question (Ron)
>  10. Re: Relay Repair - Demagnetization Question (Glen Zook)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 1 Feb 2010 15:30:05 -0500
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> Subject: [Boatanchors] Relay Repair - Demagnetization Question
> To: <boatanchors at mailman.qth.net>
> Message-ID: <9BC32972167D423D8F603F918EF3E629 at GregMijalPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi:
>
> I was wondering if anyone has used an electric demagnetizing tool to 
> remove  residual magnetization effects from the relays we use in our 
> boatanchor radio stuff.
> Sometimes after re-newing a relay, I've noticed that the relay action is 
> still not just right and no amount of additional mechanical work will 
> help.
> Do you think and old cassette head demagnitizer would help?  That's the 
> one you turn on and then back away from the head to demagnetize.  I still 
> see those from time to time at the hamfests.
> Thanks
> Greg
> WA7LYO
> Kinston NC
>
> ------------------------------
>
> Message: 2
> Date: Mon, 1 Feb 2010 14:34:29 -0600
> From: "Dave Meitzen" <dmeitzen at tx.rr.com>
> Subject: [Boatanchors] test equipment FS + spectrum analyzer
> To: "'boatanchors'" <boatanchors at mailman.qth.net>
> Message-ID: <EF.42.11092.8CA376B4 at cdptpa-omtalb.mail.rr.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
> HP Spectrum Analyzer (covers 0 to 18GHz) All working bundle $1400
>
> Main Frame T141
>
> IF HP-8552B
>
> RF Sections
>
> HP-8553B 0-11MHz and 0-110MHz
>
> HP-8554B 0-1250MHz
>
> HP-8555B 0-18GHz
>
> Tektronix Equipment
>
> Main Frames (not working - complete)
>
> TEK 7604 $40
>
> TEK 7904 $50
>
> Plug in's all working
>
> TEK 7A26 Dual Trace (have 2 units) $60 ea
>
> TEK 7A18N Dual Trace $60
>
> TEK 7A22 Differential Amplifier $60
>
> TEK 7B80 Timebase to 10ns $80
>
> TEK 7B85 Timebase with Delay to 10ns $90
>
> TEK Logic Analyzer (fit 5xxx/7xxx mainframes)
>
> TEK 7D01 16 channel with P6451 Probes $200
>
> one NIB set and 2 used
>
> TEK DL-2 16 channel digital latch uses $40
>
> the same probes P6451 (not included)
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 1 Feb 2010 17:43:58 -0500
> From: Mark K3MSB <mark.k3msb at gmail.com>
> Subject: [Boatanchors] Classic Exchange Contest (CW)
> To: List Boatanchors <boatanchors at mailman.qth.net>
> Message-ID:
> <9ee269241002011443x34e17509md8f15f32d94caca5 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I dunno..... I thought there was much more activity yesterday than in the
> previous few years.....
>
> Had a blast !!
>
> Mark K3MSB
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 1 Feb 2010 20:23:40 -0500
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> Subject: [Boatanchors] New Bern Radio Club Auction February 6th
> To: <boatanchors at mailman.qth.net>
> Message-ID: <70A6B43A59BF4DFEAC9515632577AE1D at GregMijalPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 1 Feb 2010 20:53:37 -0500
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> Subject: [Boatanchors] NEW BERN NC RADIO CLUB AUCTION FEB 6TH
> To: <boatanchors at mailman.qth.net>
> Cc: Old Tube Radios <glowbugs at piobaire.mines.uidaho.edu>
> Message-ID: <9B00BE56E35B4ACFB7D4FCAED607DE98 at GregMijalPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi:
>
> You are invited to the New Bern North Carolina Amateur Radio Club's Ham 
> Radio Auction
>
> When: Saturday, February 6th set up and browse at 8 AM, Auction starts at 
> 9 am and goes until noon.
> Where: The Courtyards at Berne Village ( Bistro Room) 2701 Amhurst Blvd, 
> New Bern, North Carolina.
>
> Auction info: The club can auction your gear for you for 10 percent of the 
> sale total.
> You are welcome to donate gear to the club and the club keeps all 
> proceeds.
> Payment is by cash or check only, no plastique
> Equipment must be marked working or non-working.  If your not sure don't 
> sweat it.
> Do not bring old Princess phones or 386 computers!!
> Coffee, OJ and danish served.
>
> FYI boatanchors/ tubes will be well represented. Right, Al W8UT?
>
> If you have never been to a ham auction come on over. They're fun!
> If you need turn by turn directions to the auction, send me an email.
> 73's
> Greg
> WA7LYO
> Kinston NC
>
> ------------------------------
>
> Message: 6
> Date: Mon, 1 Feb 2010 22:26:47 -0500
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> Subject: [Boatanchors] WTB: 12.6 vac @ 5-6 amp filament transformer
> To: <boatanchors at mailman.qth.net>
> Cc: Old Tube Radios <glowbugs at piobaire.mines.uidaho.edu>
> Message-ID: <D54E512766DF477F9670FF9828B945AA at GregMijalPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi:
> Looking to buy or trade for a 110 vac in/ 12.6 vac out filament @ 5 to 6 
> amps transformer. Center tap unimportant.
> The old Radio Shack open frame one would be perfect but they don't sell 
> them anymore.
> Any case format will do.
> I got good trading stuff too.
> Thanks
> Greg
> WA7LYO
> Kinston NC
>
> ------------------------------
>
> Message: 7
> Date: Mon, 1 Feb 2010 23:07:52 -0500
> From: "Keith Densmore" <densmore at kaponline.com>
> Subject: [Boatanchors] SSB Filter 6.4 MHZ
> To: <Boatanchors at mailman.qth.net>
> Cc: Military Surplus net List <milsurplus at mailman.qth.net>
> Message-ID: <241C8554E90147BAAA0098433B2D0EDF at keitha8b21f77c>
> Content-Type: text/plain; format="flowed"; charset="iso-8859-1";
> reply-type="original"
>
> Hello All,
> I have a rather odd need, an upper sideband filter at an IF of 6.4 MHZ. Is
> anyone aware of any commercial or military radios that use that IF
> frequency?
>
> Thanks for any help,
>
> Keith VE3TS
>
>
>
>
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>
>
> ------------------------------
>
> Message: 8
> Date: Tue, 2 Feb 2010 07:37:44 -0500
> From: "k2sse" <k2sse at embarqmail.com>
> Subject: [Boatanchors] F.S.7360 TUBE NOS
> To: "BOATANCHORS" <boatanchors at mailman.qth.net>, "FORSALE"
> <FORSALE-SWAP at MAILMAN.QTH.NET>, "FLBA" <FLBOATANCHORS at YAHOOGROUPS.COM>
> Message-ID: <82BA70895E174F569F536F9231AC2A3B at YEN>
> Content-Type: text/plain; charset="Windows-1252"
>
> NOS from estate. Tests excellent on tube tester but excess to my needs.
> $25 shipped conus to you.
>
> There are alot of tubes from this estate.Tell me what you need.
>
> Thanks
> Al
>
> ------------------------------
>
> Message: 9
> Date: Tue, 2 Feb 2010 07:36:57 -0800 (PST)
> From: Ron <ronami at yahoo.com>
> Subject: Re: [Boatanchors] Relay Repair - Demagnetization Question
> To: boatanchors at mailman.qth.net
> Message-ID: <363910.36483.qm at web50402.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Relays are designed with very low coercivity
> (or remnance) cores. There is no need to ever
> demagnetize a relay.
>
> --- Ron
>
>
>
> ________________________________
> From: Greg Mijal <bluebirdtele at embarqmail.com>
> To: boatanchors at mailman.qth.net
> Sent: Mon, February 1, 2010 3:30:05 PM
> Subject: [Boatanchors] Relay Repair - Demagnetization Question
>
> Hi:
>
> I was wondering if anyone has used an electric demagnetizing tool to 
> remove  residual magnetization effects from the relays we use in our 
> boatanchor radio stuff.
> Sometimes after re-newing a relay, I've noticed that the relay action is 
> still not just right and no amount of additional mechanical work will 
> help.
> Do you think and old cassette head demagnitizer would help?  That's the 
> one you turn on and then back away from the head to demagnetize.  I still 
> see those from time to time at the hamfests.
> Thanks
> Greg
> WA7LYO
> Kinston NC
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>
>
> ------------------------------
>
> Message: 10
> Date: Tue, 2 Feb 2010 08:31:22 -0800 (PST)
> From: Glen Zook <gzook at yahoo.com>
> Subject: Re: [Boatanchors] Relay Repair - Demagnetization Question
> To: boatanchors at mailman.qth.net, Ron <ronami at yahoo.com>
> Message-ID: <823196.17187.qm at web52901.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> In theory, yes.  But, unfortunately, in reality, no!  There are all sorts 
> of relays "out there" that, when run from DC, definitely get magnetized. 
> The "fix" is to reverse the connections periodically.  Now when run from 
> AC the problem doesn't exist.
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Tue, 2/2/10, Ron <ronami at yahoo.com> wrote:
>
> Relays are designed with very low coercivity (or remnance) cores. There is 
> no need to ever demagnetize a relay.
>
>
>
>
>
> ------------------------------
>
> ______________________________________________________________
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> Help: http://mailman.qth.net/mmfaq.htm
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> ** For Assistance: dfischer at usol.com **
>
>
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> End of Boatanchors Digest, Vol 73, Issue 2
> ******************************************

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