With IR how do you know if you are measuring actual tube envelope glass/seal
temp or the radiated heat itself?
Same when measuring exterior anode tubes. Are you seeing the tube structure
or the hot air coming out?
Probably a little easier on the exterior anode tube as you can move the IR
thermometer window down away from the air flow some.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Carl
> Sent: Thursday, April 07, 2011 7:07 PM
> To: Barrie Smith; amps@contesting.com
> Subject: Re: [Amps] Alpha vs Henry
>
> Inaccurate in the sense that its just a ballpark indicator.
>
> I like the IR method since it tells me the glowing 304TL's are not
> really
> going to melt!
>
> It also told me that I can use a smaller and slower blower on the
> 3CX1000A7
> 2M amp, the one Ive been using for 25+ years is probably fine for a YC-
> 156!
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Barrie Smith" <barrie@centric.net>
> To: "Carl" <km1h@jeremy.mv.com>; <amps@contesting.com>
> Sent: Thursday, April 07, 2011 6:15 PM
> Subject: Re: [Amps] Alpha vs Henry
>
>
> >
> >
> >> Ancient and inaccurate tech, even I moved into the 21st century!
> >>
> >> Carl
> >> KM1H
> >
> > Well, since I first used Templestick in the 1950s, I knew it was
> ancient,
> > but I didn't know it was inaccurate.
> >
> > What with all that "Heavy Metal" in your shack you'd be hard-pressed
> to
> > prove you've moved into the 21ST century!
> >
> > 73, Barrie, W7ALW
> >>
> >>
> >> ----- Original Message -----
> >> From: "Barrie Smith" <barrie@centric.net>
> >> To: <amps@contesting.com>
> >> Sent: Thursday, April 07, 2011 3:13 PM
> >> Subject: Re: [Amps] Alpha vs Henry
> >>
> >>
> >> Why not just use Templestick?
> >>
> >> 73, Barrie, W7ALW
> >>
> >> ----- Original Message -----
> >> From: "Carl" <km1h@jeremy.mv.com>
> >> To: "Jeff Blaine" <keepwalking188@yahoo.com>; <amps@contesting.com>
> >> Sent: Thursday, April 07, 2011 10:32 AM
> >> Subject: Re: [Amps] Alpha vs Henry
> >>
> >>
> >> Not as fast as the speed of light, it takes 2 handed coordination(-;
> Or
> >> 2
> >> people if you also want to immediately kill amp power, take the shot
> and
> >> then power up again for normal cooldown.
> >>
> >> Carl
> >> KM1H
> >>
> >>
> >> ----- Original Message -----
> >> From: "Jeff Blaine" <keepwalking188@yahoo.com>
> >> To: "Carl" <km1h@jeremy.mv.com>; <amps@contesting.com>
> >> Sent: Thursday, April 07, 2011 12:56 PM
> >> Subject: Re: [Amps] Alpha vs Henry
> >>
> >>
> >>> Carl,
> >>>
> >>> You are right on the affected reading.
> >>>
> >>> On the couple of IR guns that I have, they seem to be affected by
> some
> >>> frequencies more than others. So I try to check it while the
> >>> rf is rocking by picking a different band.
> >>>
> >>> The problem I see with the key-up measurement is that, with an
> efficient
> >>> cooling, the change in temp vs. time is very fast. So you
> >>> are left to interpolate the slope of the temp drop and estimate the
> peak
> >>> anode temps to an extent.
> >>>
> >>> 73, Jeff ACØC
> >>> www.ac0c.com
> >>>
> >>> -----Original Message-----
> >>> From: Carl
> >>> Sent: Thursday, April 07, 2011 9:16 AM
> >>> To: Jeff Blaine ; amps@contesting.com
> >>> Subject: Re: [Amps] Alpha vs Henry
> >>>
> >>> I was referring to an IR gun for actual anode temp. Do it right
> after
> >>> key
> >>> up
> >>> as RF has a tendency to affect the gun.
> >>>
> >>> You may be surprised at how cool the anodes are often run. Another
> thing
> >>> to
> >>> look at is the color of the anode and the fins; if they are not
> >>> discolored
> >>> you havent reach anywhere near the danger point yet.
> >>>
> >>> Ive had many tubes of the 8874, 8122, 8877, 3CX800 variety, and
> others,
> >>> come
> >>> thru here that are severely heat discolored yet are perfectly fine.
> >>>
> >>> Carl
> >>> KM1H
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Jeff Blaine" <keepwalking188@yahoo.com>
> >>> To: "damon stewart" <wsmc551@gmail.com>
> >>> Cc: "Carl" <km1h@jeremy.mv.com>; "Al Kozakiewicz"
> >>> <akozak@hourglass.com>;
> >>> <amps@contesting.com>
> >>> Sent: Wednesday, April 06, 2011 9:55 PM
> >>> Subject: Re: [Amps] Alpha vs Henry
> >>>
> >>>
> >>> Sorry Damon to confuse.
> >>>
> >>> The exhaust temp is only good for determining how long it takes the
> >>> tube/exhaust to get up to a steady temp. The actual temp around the
> >>> tube
> >>> cannot be easily deduced from this, as far as I can tell although I
> >>> think
> >>> it
> >>> should be in theory.
> >>>
> >>> A decent but not perfect solution is measuring the anode temp with
> an IR
> >>> gun
> >>> at the end of a run just prior to key up. And that will be much
> higher
> >>> than
> >>> the exhaust temp.
> >>>
> >>> 73, Jeff ACØC
> >>> www.ac0c.com
> >>>
> >>>
> >>>
> >>> From: damon stewart
> >>> Sent: Wednesday, April 06, 2011 8:41 PM
> >>> To: Jeff Blaine
> >>> Cc: Carl ; Al Kozakiewicz ; amps@contesting.com
> >>> Subject: Re: [Amps] Alpha vs Henry
> >>>
> >>> You dont want the exhaust temp to get anywhere close to the seal
> temp!
> >>> By that point your seal temp is way past the limit. On an 8877 the
> seal
> >>> temp is rated at 250 deg C max (480 deg F). Id try to keep the
> exhaust
> >>> temp below 300 deg F.
> >>>
> >>>
> >>>
> >>> On Wed, Apr 6, 2011 at 6:33 PM, Jeff Blaine
> <keepwalking188@yahoo.com>
> >>> wrote:
> >>>
> >>> RTTY contest duty is the worst for the transformer - not for the
> tube.
> >>>
> >>> The thermal mass of the transformer is huge and if it starts out
> with a
> >>> low temp the gradient will keep the innermost windings from
> >>> heating to max in RTTY service until you've been running for an
> hour or
> >>> so. And as the guys mentioned earlier, any air circulation
> >>> on the transformer (even really minimal levels) will have a huge
> impact
> >>> on
> >>> the final temps the tx reaches.
> >>>
> >>> If you want to whack the tube, a good 5 minute RTTY transmission is
> the
> >>> way to go. The tube heats up to it's max after maybe 15-30
> >>> seconds - just stick a probe and watch the exhaust temps stop
> rising at
> >>> some point the system is stable and if you have not pushed
> >>> pass the tube op temps (seal limited) then it's probably going to
> be
> >>> fine.
> >>>
> >>> 73, Jeff ACØC
> >>> www.ac0c.com
> >>>
> >>> -----Original Message-----
> >>> From: Carl
> >>> Sent: Wednesday, April 06, 2011 7:44 PM
> >>> To: Al Kozakiewicz ; amps@contesting.com
> >>> Subject: Re: [Amps] Alpha vs Henry
> >>>
> >>> Maybe time to see what the anode temperature is but Id think 1000W
> out
> >>> would
> >>> be fine.
> >>>
> >>> Carl
> >>> KM1H
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Al Kozakiewicz" <akozak@hourglass.com>
> >>> To: <amps@contesting.com>
> >>> Sent: Wednesday, April 06, 2011 8:35 PM
> >>> Subject: Re: [Amps] Alpha vs Henry
> >>>
> >>>
> >>> > 1500 watts continuous for 30 minutes; 2500 for 30 seconds.
> >>> >
> >>> > Even if I do nothing but call CQ every 2 seconds, that's probably
> >>> "only"
> >>> > about a 60% duty cycle. I'm just trying to get a feel for how
> much
> >>> > derating is prudent when using the thing for extended periods of
> >>> time.
> >>> >
> >>> > 73
> >>> >
> >>> > Al
> >>> > AB2ZY
> >>> >
> >>> > -----Original Message-----
> >>> > From: Carl [mailto:km1h@jeremy.mv.com]
> >>> > Sent: Wednesday, April 06, 2011 5:37 PM
> >>> > To: Al Kozakiewicz; amps@contesting.com
> >>> > Subject: Re: [Amps] Alpha vs Henry
> >>> >
> >>> > What does Ameritron say?
> >>> >
> >>> > Carl
> >>> > KM1H
> >>> >
> >>> >
> >>> > ----- Original Message -----
> >>> > From: "Al Kozakiewicz" <akozak@hourglass.com>
> >>> > To: <amps@contesting.com>
> >>> > Sent: Wednesday, April 06, 2011 5:05 PM
> >>> > Subject: Re: [Amps] Alpha vs Henry
> >>> >
> >>> >
> >>> >> Can anyone tell me how much power an AL-1500 is rated to produce
> at
> >>> a
> >>> >> 100%
> >>> >> duty cycle?
> >>> >>
> >>> >> During RTTY contests and outputting about 1000 watts, the tube
> side
> >>> of
> >>> >> the
> >>> >> cabinet gets mighty warm. The power supply side seems cool -
> but
> >>> then,
> >>> >> that's with the cover on. I don't know how hot is too hot and
> it
> >>> would
> >>> >> be
> >>> >> useful to know at least how much continuous power the supply is
> >>> rated
> >>> >> for.
> >>> >>
> >>> >> Tube cooling is probably another issue...
> >>> >>
> >>> >> Al
> >>> >> AB2ZY
> >>> >> _______________________________________________
> >>> >> Amps mailing list
> >>> >> Amps@contesting.com
> >>> >> http://lists.contesting.com/mailman/listinfo/amps
> >>> >
> >>> > _______________________________________________
> >>> > Amps mailing list
> >>> > Amps@contesting.com
> >>> > http://lists.contesting.com/mailman/listinfo/amps
> >>>
> >>> _______________________________________________
> >>> Amps mailing list
> >>> Amps@contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/amps
> >>>
> >>> _______________________________________________
> >>> Amps mailing list
> >>> Amps@contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/amps
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> Damon Stewart, KJ7E
> >>>
> >>
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >>
> >
> >
> >
>
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