On Fri, 29 May 1998 08:34:59 +0000 Tom Rauch
<10eesfams2mi@mass1-pop.pmm.mci.net> writes:
To: <amps@contesting.com>
>> Date: Fri, 29 May 1998 02:03:07 -0400 (EDT)
>> From: km1h@juno.com
>> Subject: Re: [AMPS] More amplifier experiments
>
>> I would be interested in what L value you found in the 5W versions?
>
>About 60 nanohenries at a test frequency of 100 MHz.
That does seem a bit high but what effect would it have in a suppressor ?
I have never been clear on that point since it appears that a minute
amount of inductance is compensated for by the L that is selected.
What test equipment was used? HP model # ? I can probably get some
network analyzer time over the weekend.
>
>What is the test frequency and inductance measuring capability of
>your equipment? Does the "Tek 130" measure and display
>both resistance and reactance?
No just L at a 1KHz test frequency which I agree is rather old
fashioned....but my nice HP digital LCR meter is kaput until I can find a
repair facility...or the time to dig into it myself.
>
>> As far as brand, I talked to a Mouser Product Mgr today and was
>assured
>> that a particular catalog part # was directly connected to a
>particular
>> manufacturer. If they changed sources the part # would change. The
>5W
>> that I buy are made by Xicon and the mgr said that if Xicon sources
>from
>> different countries the specs are identical..
>
>Inductance is not a normal spec, and is not considered in evaluating
>non-specialized resistor sources.
I get the feeling that others before me asked the inductance question so
they had an answer ready.
>
>Have you cut one of your "non-inductive" resistors open and looked at
>the construction?
No but I will.
>
>Seriously, I'd like to find a high-power non-inductive metal film
>resistor. I hope your data is correct on this one, because carbon
>composition resistors are getting expensive.
How about MFJ sources? They already use a non-inductive resistor in their
tuners, does their source produce a 5 or 10W version?
I havent looked very close but what are Alpha, Command and QRO using?
73 Carl KM1H
>
>73, Tom W8JI
>w8ji.tom@MCIONE.com
>
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