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Old June 5th 07, 02:40 AM posted to rec.radio.amateur.antenna
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Default Through-glass antenna power limits


"John Smith I" wrote in message
...
Thomas & Karen Mitchell wrote:

...
So: I'll stay at 25 when in the car.

-- KG7U
--------------------------------------------------------------------------
Tom Mitchell, Port Angeles, Washington, USA
http://www.olympus.net/personal/kg7u
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Every engineer, worth his pay, which I know, allow at least a 20% excess
on ratings.

50 X 20% = 10 watts

50 + 10 = 60 watts

I'd run the 65 and examine the glass mount now and then. You'll see if
damage begins and switch lower power.

Warm regards,
JS


That sounds like a girl waiting until she is just a litte bit pregnant to
stat us birth control.
Either the glass cracks, it starts to delaminate, or you fry your finals,
all could be too far by the time you see it.


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Old June 5th 07, 03:47 AM posted to rec.radio.amateur.antenna
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Default Through-glass antenna power limits

Jimmie D wrote:
"John Smith I" wrote in message
...
Thomas & Karen Mitchell wrote:

...
So: I'll stay at 25 when in the car.

-- KG7U
--------------------------------------------------------------------------
Tom Mitchell, Port Angeles, Washington, USA
http://www.olympus.net/personal/kg7u
--------------------------------------------------------------------------

Every engineer, worth his pay, which I know, allow at least a 20% excess
on ratings.

50 X 20% = 10 watts

50 + 10 = 60 watts

I'd run the 65 and examine the glass mount now and then. You'll see if
damage begins and switch lower power.

Warm regards,
JS


That sounds like a girl waiting until she is just a litte bit pregnant to
stat us birth control.
Either the glass cracks, it starts to delaminate, or you fry your finals,
all could be too far by the time you see it.



If the glass breaks, replace glass (highly unlikely! Bordering on
impossible!)

Glass cracking? Very unlikely!

Delamination? Perhaps, over much time ...

Fry the finals? What idiot would ever start using a rig and antenna
with no SWR indication?

JS
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Old June 5th 07, 08:27 AM posted to rec.radio.amateur.antenna
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Posts: 158
Default Through-glass antenna power limits


That sounds like a girl waiting until she is just a litte bit pregnant to
stat us birth control.
Either the glass cracks, it starts to delaminate, or you fry your finals,
all could be too far by the time you see it.



It is the ratings of the components in the matching unit that limit the
power rating not the glass, you will get smoke well before any damage to the
glass.

Jeff


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Old June 5th 07, 01:43 PM posted to rec.radio.amateur.antenna
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Posts: 287
Default Through-glass antenna power limits


"Jeff" wrote in message
. com...

That sounds like a girl waiting until she is just a litte bit pregnant to
stat us birth control.
Either the glass cracks, it starts to delaminate, or you fry your
finals, all could be too far by the time you see it.



It is the ratings of the components in the matching unit that limit the
power rating not the glass, you will get smoke well before any damage to
the glass.

Jeff

So far the only damageI have seen from this is to the lamination inside the
glass. I wouldnt want to wait until this occurs before I decided to quit.


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Old June 5th 07, 05:39 PM posted to rec.radio.amateur.antenna
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Posts: 1,154
Default Through-glass antenna power limits

Jimmie D wrote:

...
So far the only damageI have seen from this is to the lamination inside the
glass. I wouldnt want to wait until this occurs before I decided to quit.


De-lamination on the vettes' rear window? Absolutely WON'T take the chance!

The Park Avenue Buick? Who cares? Doubt it would even affect
resale/trade-in value ...

JS




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