Topband: New MFJ 259C available

[Charlie Cunningham]

Well, SMA is probably the most generally useful. With the adaptors in place,
we just have to make sure that we include the adaptors in our calibrations.
When it gets to be really "witchy" is when we need to calibrate a miniature
coax or semi-rigid line to solder into a PC board to measure at the input of
an IC, or balun, or printed antenna etc. Then we have to trim the line very
carefully and tack tiny surface mount 50 ohm and 0-ohm resistors across the
line to calibrate - each step being done under a microscope! Tedious - but
it can be done!

73,
Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 3:01 PM
To: Charlie Cunningham; jim at audiosystemsgroup.com; topband at contesting.com
Subject: Re: Topband: New MFJ 259C available

SMA for the 24GHz, open, thru and short. I also have high end adaptors to N,

APC, etc.

There may even be an old type N cal kit from "back in the eighties"

Carl
KM1H


----- Original Message ----- 
From: "Charlie Cunningham" <charlie-cunningham at nc.rr.com>
To: "'Carl'" <km1h at jeremy.mv.com>; <jim at audiosystemsgroup.com>; 
<topband at contesting.com>
Sent: Tuesday, March 04, 2014 2:53 PM
Subject: RE: Topband: New MFJ 259C available


> Those should surely be accurate enough, but what kind of connectors?
>
> Charlie, K4OT V
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Carl
> Sent: Tuesday, March 04, 2014 2:41 PM
> To: jim at audiosystemsgroup.com; topband at contesting.com
> Subject: Re: Topband: New MFJ 259C available
>
> Can HP microwave loads be used? I have a set good to 24 GHz and another to
> 50 GHz.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Jim Brown" <jim at audiosystemsgroup.com>
> To: <topband at contesting.com>
> Sent: Tuesday, March 04, 2014 1:35 PM
> Subject: Re: Topband: New MFJ 259C available
>
>
>> On 3/4/2014 7:25 AM, Paul Christensen wrote:
>>> My only concern with the VNWA is in its ability to measure Topband
>>> antenna systems where sweeps are required into the AMBC band.
>>
>> I'm a VERY happy owner of the 3E model VNWA. I've made measurements on my
>> 160M antennas with no difficulty, but I'm out in the boonies, not close
>> enough to strong BC signals to have seen any issues.
>>
>> As to precision of calibration loads -- after I got the VNWA, I did a
>> search looking for calibration loads, and quickly learned that if you 
>> want
>
>> better than 1% precision, it's easy to spend as much for the load as for
>> the VNWA itself!
>>
>> 73, Jim K9YC
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