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
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>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>>
>>>
>>> --
>>> Damon Stewart, KJ7E
>>>
>>
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>>
>>
>>
>>
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>>
>>
>
>
>
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