--=====================_1770010==_.ALT
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 07:36 PM 3/4/00 -0700, you wrote:
> >Dan Hearn, N5AR wrote:
> >
> >>I have been using these resistors (Globars) in parasitic suppressors
> for many
> >>years . Has anyone ever had one of these fail or change value without a
> >>change in external appearance?
> >Like you Dan, I've used the small Globars for years for parasitic
> >suppressors and now, more recently for glitch protection and never found
> >any problem whatsoever. I also saw them in use for some commercial
> >multi-kW amps, by Create Eng., with the same units.
>
>A 6" long ''non-inductive'' Globar resistor has over 100nH. One
>disadvantage to Globars is that the length to diameter ratio tends to be
>too high - typically about 6 or more to one. The L/D ratio for a vhf
>suppressor resistor needs to be low - otherwise the desired
>stagger-tuning effect is not obtained. Cesiwid/Globar/Kanthal can make
>such resistors on special orders of 1k minimum units.
> >
>later, Marv
Rich,
I wouldn't dream of using a six inch globar. Mine were type CX and TWO
inches long.
later,
Marv.
--=====================_1770010==_.ALT
Content-Type: text/html; charset="us-ascii"
<html>
<font size=3>At 07:36 PM 3/4/00 -0700, you wrote:<br>
<blockquote type=cite cite>>Dan Hearn, N5AR wrote:<br>
><br>
>>I have been using these resistors (Globars) in parasitic
suppressors for many<br>
>>years . Has anyone ever had one of these fail or change value
without a<br>
>>change in external appearance?<br>
>Like you Dan, I've used the small Globars for years for parasitic
<br>
>suppressors and now, more recently for glitch protection and never
found <br>
>any problem whatsoever. I also saw them in use for some
commercial <br>
>multi-kW amps, by Create Eng., with the same units.<br>
<br>
A 6" long ''non-inductive'' Globar resistor has over 100nH.
One <br>
disadvantage to Globars is that the length to diameter ratio tends to be
<br>
too high - typically about 6 or more to one. The L/D ratio for a
vhf <br>
suppressor resistor needs to be low - otherwise the desired <br>
stagger-tuning effect is not obtained. Cesiwid/Globar/Kanthal
can make <br>
such resistors on special orders of 1k minimum units. <br>
><br>
later, Marv </font></blockquote><br>
Rich,<br>
I wouldn't dream of using a six inch globar. Mine were type CX and
TWO inches long.<br>
<br>
later,<br>
<br>
Marv.<br>
<br>
<br>
</html>
--=====================_1770010==_.ALT--
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|