Search String: Display: Description: Sort:

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+Measuring\s+Coax\s+Loss\s*$/: 64 ]

Total 64 documents matching your query.

1. [TowerTalk] Measuring coax loss (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 26 Dec 2004 12:12:22 -0500
My HF antennas are fed with a composite feedline consisting of about 50 feet of RG-213, a run of 75-ohm CATV hardline, and a pigtail of RG-11 at the antenna end. The hardline was calculated to be a h
/archives//html/Towertalk/2004-12/msg00499.html (9,195 bytes)

2. Re: [TowerTalk] Measuring coax loss (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Sun, 26 Dec 2004 12:19:19 -0500
that the built-in also wonder about case-- can anyone measure only the 75-ohm portion, and add the Alternatively, is there theory just The MFJ manual warns users loss measurements are only accurate
/archives//html/Towertalk/2004-12/msg00500.html (7,900 bytes)

3. Re: [TowerTalk] Measuring coax loss (score: 1)
Author: "David Hachadorian" <K6LL@adelphia.net>
Date: Sun, 26 Dec 2004 11:33:23 -0700
Here's an easy procedure to make a good approximation of line loss, without disconnecting the coax up on the tower: 1. Connect an antenna analyzer to the feedline in the shack. 2. With the analyzer i
/archives//html/Towertalk/2004-12/msg00502.html (8,619 bytes)

4. [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 11 Feb 2010 11:21:34 -0800
N6RK suggested that the MFJ259B would be a good way to measure coax loss with a reflection measurement at one end only. I responded I was looking for more precision than that. Several years ago, I ca
/archives//html/Towertalk/2010-02/msg00247.html (7,819 bytes)

5. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 11 Feb 2010 13:22:15 -0800
I also have an AIM-4170 network. It is considerably better than the MFJ-259B. It would have allowed additional resolution and accuracy in a reflection mode measurement of loss. If you still want to d
/archives//html/Towertalk/2010-02/msg00249.html (10,174 bytes)

6. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Tod -ID" <tod@k0to.us>
Date: Thu, 11 Feb 2010 14:31:03 -0700
Jim and Rick: Tell me again how I can productively use the more precise information [0.6 versus 0.62 dB loss in 208 feet at 3 MHz.] in constructing my antenna feed line system. I am afraid I have bee
/archives//html/Towertalk/2010-02/msg00250.html (11,712 bytes)

7. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 11 Feb 2010 14:21:26 -0800
Good reality check Tod. I'm a metrologist (or pretend to be one at work), so precision starts to become an end in itself. We actually have paying customers who need extreme accuracy. You probably hav
/archives//html/Towertalk/2010-02/msg00251.html (8,292 bytes)

8. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 11 Feb 2010 15:49:11 -0800
Todd asked: That's my point. If you're measuring a long piece of cable at a hamfest, the MFJ is plenty good enough. If you're measuring a 10 ft piece of cable but want to know how it would work on a
/archives//html/Towertalk/2010-02/msg00252.html (8,332 bytes)

9. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 18:55:26 -0500
Still... a dB or so (or even 3) on a long run of coax isn't going to make a hill of beans difference for most applications... an S-Unit is ~ 6dB. For microwave and weak signal... sure, but you proba
/archives//html/Towertalk/2010-02/msg00253.html (9,048 bytes)

10. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 19:03:51 -0500
Forgot to mention... unless I actually SAW the 10' piece being cut off the longer roll I was considering buying from, I wouldn't trust the measurements anyway. Mike WM4B ____________________________
/archives//html/Towertalk/2010-02/msg00254.html (10,580 bytes)

11. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 11 Feb 2010 16:34:58 -0800
Only by someone's definition, not in reality. If you actually MEASURE the response of the S-meters in REAL radios, you find that an S-unit may be close to 6dB near S9, but is usually closer to 3dB at
/archives//html/Towertalk/2010-02/msg00255.html (10,698 bytes)

12. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Dan Schaaf" <dan-schaaf@att.net>
Date: Thu, 11 Feb 2010 19:44:36 -0500
Having been a calibration Engineer in my early days, I concur with Jim. In addition, each coax connector inline introduces losses. They all add up. Definitely worse in VHF/UHF. Some folks say you can
/archives//html/Towertalk/2010-02/msg00256.html (12,163 bytes)

13. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 19:59:11 -0500
Okay... I'll accept your argument about S-meters because frankly it's not worth arguing about. 3 dB or 6 dB is still not a great deal of loss at HF. I doubt that most of us can hear 3 to 6 dB 99% of
/archives//html/Towertalk/2010-02/msg00257.html (14,928 bytes)

14. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 20:01:01 -0500
I qualified my comments to exclude microwave/weak signal work. If you have that many connectors in-line, how concerned are you REALLY about loss? C'mon guys... for HF and probably VHF, it isn't that
/archives//html/Towertalk/2010-02/msg00258.html (14,641 bytes)

15. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 11 Feb 2010 17:03:01 -0800
If I wanted to accurately measure the loss on a 10 ft piece of cable, I would short circuit one end. I would put a TEE on my signal generator front panel connector and connect a power meter sensor t
/archives//html/Towertalk/2010-02/msg00259.html (11,166 bytes)

16. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Dan Schaaf" <dan-schaaf@att.net>
Date: Thu, 11 Feb 2010 20:07:07 -0500
A really serious DXer is concerned about these losses. Someone who casually operates may not care too much. The point is that all losses add up. I CAN hear the difference. For example. +/- 3 db is ei
/archives//html/Towertalk/2010-02/msg00260.html (17,085 bytes)

17. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 20:13:16 -0500
Think what you want, Dan... I stand by my argument that 99% of the time 3dB is inaudible. I love the sanctimonious attitude on this list. If somebody disagrees, they're automatically unqualified or s
/archives//html/Towertalk/2010-02/msg00261.html (18,115 bytes)

18. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: Stan Stockton <k5go@cox.net>
Date: Thu, 11 Feb 2010 19:17:24 -0600
dB's.....They are really easy to get in the beginning and become VERY difficult to get once you have about a dozen. They are also extremely addictive. The more of them you have the more of them you w
/archives//html/Towertalk/2010-02/msg00262.html (13,916 bytes)

19. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Mike Besemer \(WM4B\)" <mwbesemer@cox.net>
Date: Thu, 11 Feb 2010 20:19:15 -0500
So... assuming (as someone suggested) that an S-Unit is 3dB... can you hear the difference between S9+40 and S9+41? S9 & S10? S7 & s8? dB's.....They are really easy to get in the beginning and become
/archives//html/Towertalk/2010-02/msg00263.html (14,668 bytes)

20. Re: [TowerTalk] Measuring Coax Loss (score: 1)
Author: "Dan Schaaf" <dan-schaaf@att.net>
Date: Thu, 11 Feb 2010 20:23:50 -0500
I am not " thinking what I want". I know this to be fact. I experience it daily. Nobody is disqualifying you or accusing you of stupidity. There is a difference between stupidity and ignorance. Ignor
/archives//html/Towertalk/2010-02/msg00264.html (20,888 bytes)


This search system is powered by Namazu