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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+New\s+MFJ\s+259C\s+available\s*$/: 37 ]

Total 37 documents matching your query.

21. Re: Topband: New MFJ 259C available (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 4 Mar 2014 19:42:32 -0500
Well, of course we don't, Mike. That was just a comment about the challenges of calibrating tiny transmission lines for use with a VNA. No microscopes needed for RG-8 or even RG-58! :-) 73, Charie, K
/archives//html/Topband/2014-03/msg00052.html (10,886 bytes)

22. Re: Topband: New MFJ 259C available (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Tue, 4 Mar 2014 20:52:14 -0500
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
/archives//html/Topband/2014-03/msg00053.html (11,498 bytes)

23. Re: Topband: New MFJ 259C available (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 4 Mar 2014 21:48:28 -0500
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,
/archives//html/Topband/2014-03/msg00054.html (10,823 bytes)

24. Re: Topband: New MFJ 259C available (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Tue, 4 Mar 2014 22:04:58 -0500
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 capabilit
/archives//html/Topband/2014-03/msg00055.html (12,150 bytes)

25. Re: Topband: New MFJ 259C available (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 04 Mar 2014 21:24:56 -0800
On 3/4/2014 7:04 PM, Charlie Cunningham wrote: I'd also like to be able to apply VNA measurements to some of my HF antennas and I might be willing to take a laptop out there to do that, but I could a
/archives//html/Topband/2014-03/msg00056.html (11,674 bytes)

26. Re: Topband: New MFJ 259C available (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 5 Mar 2014 08:31:39 -0500
"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 a 259 revision wth direct conversion receivers and a wide frequency
/archives//html/Topband/2014-03/msg00058.html (11,012 bytes)

27. Re: Topband: New MFJ 259C available (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Wed, 5 Mar 2014 09:44:46 -0500
Thanks, Jim! That's good information, I'll look into it! Thanks! Most of my VNA work in recent years was in the design, tuning and matching of embedded antennas for 900 MHz, 1.4 GHz and 2.5 GHz for e
/archives//html/Topband/2014-03/msg00059.html (12,788 bytes)

28. Re: Topband: New MFJ 259C available (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 5 Mar 2014 10:09:16 -0500
The RigExpert handheld series of complex impedance analyzers pretty much fit that goal. The AA-54 is in the same price class as the MFJ-259B and has +13 dBm output power. It doesnt have the frequency
/archives//html/Topband/2014-03/msg00060.html (11,852 bytes)

29. Re: Topband: New MFJ 259C available (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 5 Mar 2014 10:15:56 -0500
+13 dBm is nothing. That is only 20 milliwatts or 1 volt across 50 ohms if that is at 50 ohms. +13 dBm may be more than adequate depending on that unit's (AA-54) selectivity. I would like to see it's
/archives//html/Topband/2014-03/msg00061.html (10,719 bytes)

30. Re: Topband: New MFJ 259C available (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 05 Mar 2014 09:45:07 -0800
Paul, There is a VNWA users Yahoo group, which is called VNWA. :) Yahoo groups are easy to join. You could ask about AMBC issues there, and there's a good chance that someone in your area owns one an
/archives//html/Topband/2014-03/msg00063.html (11,220 bytes)

31. Re: Topband: New MFJ 259C available (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 5 Mar 2014 13:08:39 -0500
Hi Paul, Where is a selectivity spec or a description?? 73 Tom +13 dBm is nothing. That is only 20 milliwatts or 1 volt across 50 ohms if that is at 50 ohms. +13 dBm may be more than adequate dependi
/archives//html/Topband/2014-03/msg00064.html (12,095 bytes)

32. Re: Topband: New MFJ 259C available (score: 1)
Author: "Kees Nijdam" <clnijdam@knid.nl>
Date: Wed, 5 Mar 2014 19:24:25 +0100
Hello, In my qth you need at least 30 dBm (1 Watt) for reliable measurements with a broadband detector. The 160m antenna picks up such an amount of signals that with less power you do not get correct
/archives//html/Topband/2014-03/msg00065.html (12,912 bytes)

33. Re: Topband: New MFJ 259C available (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 5 Mar 2014 14:03:07 -0500
Where is a selectivity spec or a description?? 73 Tom Tom, Apart from the N2PK analyzer, I don't know any published selectivity spec. The detector minimum res. bandwidth of the N2PK unit is 7 Hz and
/archives//html/Topband/2014-03/msg00066.html (12,105 bytes)

34. Re: Topband: New MFJ 259C available (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 05 Mar 2014 14:32:58 -0500
... and looks like a couple other locals at 1010 and 1060. 73, ... Joe, W4TV 73 Tom Tom, Apart from the N2PK analyzer, I don't know any published selectivity spec. The detector minimum res. bandwidt
/archives//html/Topband/2014-03/msg00067.html (12,361 bytes)

35. Re: Topband: New MFJ 259C available (score: 1)
Author: "Gregg W6IZT" <gregg.w6izt1@gmail.com>
Date: Wed, 5 Mar 2014 14:42:34 -0500
The AIM4170 family is not included in this review? Gregg W6IZT ... and looks like a couple other locals at 1010 and 1060. 73, ... Joe, W4TV On 3/5/2014 2:03 PM, Paul Christensen wrote: ______________
/archives//html/Topband/2014-03/msg00068.html (13,095 bytes)

36. Re: Topband: New MFJ 259C available (score: 1)
Author: "Gregg W6IZT" <gregg.w6izt1@gmail.com>
Date: Wed, 5 Mar 2014 14:43:28 -0500
My bad, I see it now. The AIM4170 family is not included in this review? Gregg W6IZT ... and looks like a couple other locals at 1010 and 1060. 73, ... Joe, W4TV On 3/5/2014 2:03 PM, Paul Christensen
/archives//html/Topband/2014-03/msg00069.html (13,400 bytes)

37. Re: Topband: New MFJ 259C available (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 5 Mar 2014 14:54:14 -0500
Hi Paul, Reading the link, it looks like there are very few analyzers that use receivers, either superheterodyne or direct conversion. The AA-54 is in the class of broadband detectors, which are all
/archives//html/Topband/2014-03/msg00070.html (13,767 bytes)

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