Topband
[Top] [All Lists]

Re: Topband: New MFJ 259C available

To: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>, <jim@audiosystemsgroup.com>, <topband@contesting.com>
Subject: Re: Topband: New MFJ 259C available
From: "Carl" <km1h@jeremy.mv.com>
Date: Tue, 4 Mar 2014 17:40:26 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>
I have the B&H microscope, stand, light, table, etc as well as a hot plate and access to a bonder when needed. Plus various knives, blades, scalpels, gold plated needle point iron, etc for fine tuning (-;

I still do a bit of prototyping for former employers and stuff for myself to 24 GHz. Its down at HF I need to improve some of the test equipment.

Carl
KM1H




Sent: Tuesday, March 04, 2014 3:19 PM
Subject: RE: Topband: New MFJ 259C available


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@contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 3:01 PM
To: Charlie Cunningham; jim@audiosystemsgroup.com; topband@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@nc.rr.com>
To: "'Carl'" <km1h@jeremy.mv.com>; <jim@audiosystemsgroup.com>;
<topband@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@contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 2:41 PM
To: jim@audiosystemsgroup.com; topband@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@audiosystemsgroup.com>
To: <topband@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
_________________
Topband Reflector Archives - http://www.contesting.com/_topband


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4335 / Virus Database: 3705/7150 - Release Date: 03/04/14


_________________
Topband Reflector Archives - http://www.contesting.com/_topband



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4335 / Virus Database: 3705/7150 - Release Date: 03/04/14


_________________
Topband Reflector Archives - http://www.contesting.com/_topband



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4335 / Virus Database: 3705/7150 - Release Date: 03/04/14


_________________
Topband Reflector Archives - http://www.contesting.com/_topband

<Prev in Thread] Current Thread [Next in Thread>