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Total 17 documents matching your query.

1. [Amps] Antenna tuner loss (score: 1): Author: Dan Hearn <n5ardxcc@gmail.com>; Date: Thu, 3 May 2012 09:32:39 -0700; ARRL tested some popular commercial antenna tuners and reported the results in QST as follows. They covered 160-10 and various loads. All were quite lossy on the low bands with low Z loads. February,; /archives//html/Amps/2012-05/msg00118.html (6,632 bytes)
2. Re: [Amps] Antenna tuner loss (score: 1): Author: Shon Edwards <sre.1966@gmail.com>; Date: Thu, 3 May 2012 11:26:03 -0600; Thanks Dan. That's been my experience, at least I've always believed it. With some of my antennas, I can't even get them to tune up on the low bands, even though they're "rated" for it. Even though t; /archives//html/Amps/2012-05/msg00122.html (7,985 bytes)
3. Re: [Amps] Antenna tuner loss (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 04 May 2012 03:32:15 -0400; And there are people out there that didn't expect this? They are running into low impedance loads which means high currents and high losses. I believe the Palstar manual even mentions this. Also the; /archives//html/Amps/2012-05/msg00156.html (7,555 bytes)
4. Re: [Amps] Antenna tuner loss (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 4 May 2012 09:22:54 -0400; The first series of tests even had the MFJ coils catching on fire in the ARRL lab at well under power ratings on 160. Tuners with 250pf max on 160 will always be inefficient, a High C tuner with 500p; /archives//html/Amps/2012-05/msg00162.html (9,283 bytes)
5. Re: [Amps] Antenna tuner loss (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 04 May 2012 07:37:29 -0600; Kevin Schmidt, W9CF, has a nice Java app where you can study the losses in a T-network tuner at http://fermi.la.asu.edu/w9cf/tuner/tuner.html Tom W0VJ _______________________________________________; /archives//html/Amps/2012-05/msg00164.html (10,150 bytes)
6. Re: [Amps] Antenna tuner loss (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 4 May 2012 15:59:54 -0500; I wouldn't touch a T network. High pass = no pass here 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a; /archives//html/Amps/2012-05/msg00184.html (11,627 bytes)
7. Re: [Amps] Antenna tuner loss (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 04 May 2012 14:13:48 -0700; The TenTec L-network design is interesting and has lower losses than most, but when I called them about it they wouldn't stand behind QRO AM/CW/digital operation on 160M even with a 50-ohm resistive; /archives//html/Amps/2012-05/msg00186.html (12,815 bytes)
8. Re: [Amps] Antenna tuner loss (score: 1): Author: W2XJ <w2xj@nyc.rr.com>; Date: Fri, 04 May 2012 17:22:15 -0400; Ts are not necessarily High pass nor are Ls for that matter. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-05/msg00187.html (12,408 bytes)
9. Re: [Amps] Antenna tuner loss (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 4 May 2012 20:49:22 -0500; Not true. Build for your particular impedance matching needs. the TT product and most made for hams are designed to attempt to match everything because that's what most hams what, the mythical do eve; /archives//html/Amps/2012-05/msg00193.html (16,472 bytes)
10. Re: [Amps] Antenna tuner loss (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 4 May 2012 21:52:08 -0400; True. they can be no pass and the coil becomes the dummy load. Very easy to do if not familiar with a T tuner. Ts are not necessarily High pass nor are Ls for that matter. ___________________________; /archives//html/Amps/2012-05/msg00194.html (13,144 bytes)
11. Re: [Amps] Antenna tuner loss (score: 1): Author: W2XJ <w2xj@nyc.rr.com>; Date: Fri, 04 May 2012 22:43:45 -0400; I guess you are only familiar with leading Ts and not lagging networks. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2012-05/msg00195.html (14,360 bytes)
12. Re: [Amps] Antenna tuner loss (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Sat, 5 May 2012 00:54:37 -0400; I am going to have to say something here. If there is a need to match two different impedances the network is no longer simply a low pass or high pass filter but becomes resonant with some Q which in; /archives//html/Amps/2012-05/msg00196.html (16,284 bytes)
13. Re: [Amps] Antenna tuner loss (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 5 May 2012 05:59:29 -0500; Because not everyone operates an appliance box from Alpha, Ameritron etc. or some plastic JA box. Some hams operate rigs with swing link networks like the BC610 (okay the link on that one rotates) wh; /archives//html/Amps/2012-05/msg00199.html (9,352 bytes)
14. [Amps] Antenna tuner loss (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 5 May 2012 06:12:22 -0700; Tuners with 250pf max on 160 will always be inefficient, a High C tuner with 500pf will be very efficient and require proportionally less L. The higher Q results in less bandwidth so there is no free; /archives//html/Amps/2012-05/msg00202.html (10,438 bytes)
15. Re: [Amps] Antenna tuner loss (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 5 May 2012 10:57:02 -0400; It would be easier to refer you to http://www.arrl.org/files/file/Technology/tis/info/pdf/9501046.pdf Or you could go to JI's site where he copied a lot of it (-; MFJ also has a High C tuner which re; /archives//html/Amps/2012-05/msg00203.html (12,184 bytes)
16. Re: [Amps] Antenna tuner loss (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Sun, 6 May 2012 00:42:34 -0400; BC610 had a unshielded adjustable link. I used to have a HT-4 when I was a teenager. I scrapped it to make an amplifier. At one time I ran 2x 250TH in grounded grid driven by a pair of 6146Bs with a; /archives//html/Amps/2012-05/msg00214.html (9,870 bytes)
17. Re: [Amps] Antenna tuner loss (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 6 May 2012 12:30:40 -0400; I guess mine was before yours. I was in AF Mars while in HS and scrapped a pair of BC-610's plus got other parts to build PP 250TH's with 810 modulators driven by a Johnson Viking I. This was in 1957; /archives//html/Amps/2012-05/msg00219.html (11,990 bytes)

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