I also recommend the VNWA. It is a true network analyzer.
The MFJ is basically a SWR meters and does not accurately display Impedance.
Mike N2MS
- Original Message -
From: Grant Saviers gran...@pacbell.net
To: Carl k...@jeremy.mv.com, topband@contesting.com
Sent: Tue, 04 Mar 2014
I had a look at the matching Rosenberger calibration standards and for the
money, the kit is a bargain. At first, I was disappointed to see what
amounts to only 1% resistive load accuracy. The displayed image on the
website shows a calibration standard that reads about 49.5 ohms. But, the
On 03/03/2014 06:37 PM, Joe Subich, W4TV wrote:
What is really a concern is the demands by wideband data advocates for
priority access to *at least 15%* of every amateur band in spectrum
coordinated in all three ITU regions. See:
http://hflink.com/bandplans/iaru_region_2.html
Applied
Apparently you did not read that URL. They're not even
asking for 1810 to 1840.
Although they do not specifically ask for an allocation on 160 meters,
their principle of 15% of every amateur band located the preferred
spectrum for common access across all three regions is clearly stated
at
FWIW, I believe such transceivers do exist. Don't the Flex SDRs have that
capability?
... as if there are any amateur transceivers capable of operating with
data bandwidth greater than 2.8 KHz.
_
Topband Reflector Archives - http://www.contesting.com/_topband
Im waiting for N6LF to add that to his review results.
http://www.antennasbyn6lf.com/files/vna_comparisons.pdf
Carl
KM1H
- Original Message -
From: Paul Christensen w...@arrl.net
To: topband@contesting.com
Sent: Tuesday, March 04, 2014 10:25 AM
Subject: Re: Topband: New MFJ 259C
Well, V73MW was a bust here. I've heard him the last two mornings but,
just as he comes out of the noise before my sunrise, he switches to 80m!
he comes back to 160m about an hour later and works the midwest.
Very frustrating!
73, Roger
_
Topband Reflector Archives -
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
On 3/4/2014 8:30 AM, Mike Waters wrote:
FWIW, I believe such transceivers do exist. Don't the Flex SDRs have that
capability?
I'm told that their phase noise is a terror!
73, Jim K9YC
_
Topband Reflector Archives - http://www.contesting.com/_topband
True!! Check out the prices of the Cal kits for the Agilent VNAs!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, March 04, 2014 1:36 PM
To: topband@contesting.com
Subject: Re: Topband: New MFJ 259C
I have made sweeps of my 160m T on many occasions as I tuned it, added
elevated radials, and then installed a remote series capacitor switch to
tune the entire band per a W8JI suggestion. There was no interference
from AMBC, I'd be glad to forward the sweeps. My current QTH does not
have a
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 j...@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
Those should surely be accurate enough, but what kind of connectors?
Charlie, K4OT V
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 2:41 PM
To: j...@audiosystemsgroup.com; topband@contesting.com
Subject: Re:
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-cunning...@nc.rr.com
To: 'Carl' k...@jeremy.mv.com;
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
What the hell is the need for wideband data in the amateur radio bands? Is
it just a ploy to usurp the amateur bands for commercial purposes? And
there's a heck of a lot more band width available at VHF and UHF! Why
wideband at HF?? Makes no sense to me!
??
Charlie, K4OTV
-Original
Is it just a ploy to usurp the amateur bands for commercial
purposes?
Yes - for the rich yachtsmen who buy ham tickets and then use the
Winlink/Sailmail stuff in the amateur bands rather than pay for
expensive maritime data service.
What the hell is the need for wideband data in the
I have the BH 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
This sure doesn't sound like topband to me !
Price W0RI
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
No, Price! Way above Topband in frequency, but the principles of Vector
Network Analysis and calibrating out the cables to move the measurement
plane to the end of the cable are the same at 1.8 MHz as they are at 2.5
GHz. And the Smith Chart applies at all frequencies from near DC to
daylight! J
This sure doesn't sound like topband to me !
That's what I was thinking. I don't understand why we have to use
microscopes and scalpels for 1.8 MHz.
73, Mike
www.w0btu.com
_
Topband Reflector Archives - http://www.contesting.com/_topband
On 3/4/2014 4:10 PM, Mike Waters wrote:
That's what I was thinking. I don't understand why we have to use
microscopes and scalpels for 1.8 MHz.
It all depends on the degree of precision that you need for whatever
project you happen to be working on. I work all bands between 1.8 MHz
and 900
So you can see better to stuff more wire in a binocular core.
But I agree with Charlie that the principles are the same and it often may
be easier to test an idea about a 160M antenna at say 10 or 6M where a 1/2
wave is only 9' for the latter.
OTOH the discussion was also about cal kits and
I thought a much more useful item would have been a 259 revision that was
totally immune to RFI, and still did about the same stuff over a wider
frequency range.
As I looked at things over the years, very few people want VNA's that attach
to PC's, and that market is covered anyway. I thought
Well, I might be willing to use a VNA that attaches to a computer in my Lab,
if I could get away with much lower cost than one of the Agilent or Rhode
and Schwarz VNAs. I'd like to have the capability to cover the 2.5 GHz
band and go considerably higher so I could look at harmonic filters for
Mike,
One of the problems with making band plans is that every region makes
its own and then forget how things are arranged in other zones.
In EU still a lot of the countries have only 1830-1850 available.
To make everybody happy the bandplan has to allow CW, digital and phone
in this 20kHz
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