[ARC5] Programmable oscillators

Sun Feb 10 16:36:15 EST 2013

Yeah but from 1 mhz up..I need 239 khz..73 de Pat/EI7CN

-----Original Message----- 
From: arc5-request at mailman.qth.net
Sent: Sunday, February 10, 2013 9:21 PM
To: arc5 at mailman.qth.net
Subject: ARC5 Digest, Vol 109, Issue 104

Send ARC5 mailing list submissions to
arc5 at mailman.qth.net

To subscribe or unsubscribe via the World Wide Web, visit
http://mailman.qth.net/mailman/listinfo/arc5
or, via email, send a message with subject or body 'help' to
arc5-request at mailman.qth.net

You can reach the person managing the list at
arc5-owner at mailman.qth.net

When replying, please edit your Subject line so it is more specific
than "Re: Contents of ARC5 digest..."

Today's Topics:

   1. Re: Programmable Oscillators (Leslie Smith)
   2. Re: ART-13 dynamotor woes (Leslie Smith)

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

Message: 1
Date: Mon, 11 Feb 2013 08:06:48 +1100
From: Leslie Smith <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Programmable Oscillators
Message-ID:
<1360530408.7925.140661189512417.0646D442 at webmail.messagingengine.com>
Content-Type: text/plain

My observation:  These are "digital" oscillators.
The signal out is probably square wave, so think carefully about the
harmonics etc that will accompany the fundamental.
Analog RF work is a world separate from the signals in the digital (TTL)
world.

73

  Leslie Smith
  vk2bcu at operamail.com

On Mon, Feb 11, 2013, at 2:50, David Stinson wrote:
> Here is a page from Digikey.  Lowest-price for through-hole
> oscillator, programmed to order by them is $4.10 in quantites of 1.
>
> http://tinyurl.com/b6kxgeo
>
> I haven't ordered any yet but will soon.
>
> I'd go with the 5-Volt type for the bigger rail-to-rail swing.
> Some even have "Tri-state" control pins so switching is easy.
>
> Output to a Pierce will probably need conditioning in some way,
> but that should be easy.
>
> 73 Dave AB5S.
>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
http://www.fastmail.fm - mmm... Fastmail...

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

Message: 2
Date: Mon, 11 Feb 2013 08:21:54 +1100
From: Leslie Smith <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Subject: Re: [ARC5] ART-13 dynamotor woes
Message-ID:
<1360531314.10321.140661189515509.2CE77E9D at webmail.messagingengine.com>

Content-Type: text/plain

Hello Robert.
Exactly.  I saw a problem like this with a "toy" air compressor.
Chinese origin.  For air-brush work.
The motor should have been "dipped" in transformer varnish and laced,
but there wasn't enough varnish or lacing to prevent movement in the
windings.

Result?  After about 5 hours or use the enamel between windings had
abraided and voila - a short between turns.
Bad news for the earth-leakage device in the switch-board.  Poof - dead.

73

  Leslie Smith
  vk2bcu at operamail.com

On Mon, Feb 11, 2013, at 6:32, WA5CAB at cs.com wrote:
> Meir,
>
> The DY-17A is a 4-pole motor/generator.  Looking at the exploded view (or
> the dynamotor stator itself - I've looked at several hundred of them),
> you
> will see that there are four field coil units.  The schematic (ref T.O.
> 12R2-5DY17A-501) shows that electrically there are 4 shunt and 2 series
> windings.
> However, being a schematic and not a wiring diagram, and considering
> manufacturing procedures one could argue it's more likely there are 4 of
> each.  In
> any case, strip the stator.  With a milli-ohmmeter determine which coil
> has
> the short.  Remove the pole piece and examine the spots where the coil
> touches the pole piece (more likely) or case (less likely).  I'd bet you
> will
> find a small gap in the tape with bare copper visible in the gap where
> the
> wire has been rubbing against the pole.  The wire itself is enamel
> insulated.
> When starting, the wire is going to try to move.  Plus although the
> DY-17A
> runs quite smoothly, there is some high frequency vibration.  It wouldn't
> take a lot of scuffing against a corner to wear through through the
> enamel.
>
> Robert D.
>
> In a message dated 02/10/2013 11:30:34 AM Central Standard Time,
> wf2u at ws19ops.com writes:
> > Folks,
> >
> >
> >
> > I have an interesting but aggravating problem with a DY-17A/ART-13 Eicor
> > manufactured dynamotor. The dyno, by the way is a late WW2 production, 
> > it
> > is
> > in pristine cosmetic condition inside and out and it was never used 
> > before
> > I
> > got it recently. After 3 weeks of running my ART-13 with it for a couple
> > of
> > hours a week, in the middle of a  CW net it started to smell like hot
> > insulation. I shut it down and troubleshooting indicated that there is a
> > short to ground somewhere in the field coils. The remaining coil portion
> > is
> > still able to spin the dyno at a much slower than normal speed, and the
> > increased current is heating it up fast. I isolated both HV and LV rotor
> > windings, they're OK. No other shorts to ground found anywhere in the
> > unit.
> >
> > I'm scratching my head, because the field coils are fed from the primary
> > 28
> > VDC, so the insulation is not breaking down from high voltage. If there
> > was
> > a manufacturing fault in the field coil installation, the short would 
> > have
> > existed from the get-go. How does a fixed field coil insulation break 
> > down
> > in a few hours of operation? Nothing is grinding, nothing is loose 
> > inside
> > the dynamotor. It spins completely freely as it should (by the way, 
> > there
> > is
> > a label inside the end bells which says: "Do not lubricate!").
> >
> > Should I venture and attempt to take the whole dynamotor apart and 
> > remove
> > the field coils to see if I can find the short?
> >
> >
> >
> > Incidentally, my other dynamotor, the older DY-17/ART-13, after 
> > replacing
> > the HV brush caps (the newer Eicor has no brush caps in the dynamotor
> > itself) is working fine. It looks beat-up on the outside, and the
> > dynamotor
> > itself looks like it was used a lot, but at least so far, so good.
> >
> >
> >
> > Any thoughts?
> >
> >
> >
> > 73, Meir WF2U
> >
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
http://www.fastmail.fm - One of many happy users:
  http://www.fastmail.fm/help/overview_quotes.html

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

_______________________________________________
ARC5 mailing list
ARC5 at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/arc5

End of ARC5 Digest, Vol 109, Issue 104
************************************** 