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Total 29 documents matching your query.

1. [AMPS] Chokes (score: 1)
Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson)
Date: Sat, 11 Mar 2000 16:24:14 -0800
Very good point, Tom. This requires a minuscule change in the load-C setting compared to a larger inductance. I hadn't thought much about this component before -- "everybody knows" you use a couple
/archives//html/Amps/2000-03/msg00582.html (8,320 bytes)

2. [AMPS] Chokes (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sat, 11 Mar 2000 20:02:18 -0500
Because that is what everyone uses, no matter what is needed. Actually, a 100-5000 uH choke would probably be much better! If you want another example of a part that people "just use", look at block
/archives//html/Amps/2000-03/msg00586.html (8,877 bytes)

3. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Sat, 11 Mar 2000 20:20:54 -0700
The highest L choke that has no resonances below 30MHz is c. 65uH. later - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@
/archives//html/Amps/2000-03/msg00591.html (8,210 bytes)

4. [AMPS] Chokes (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 12 Mar 2000 08:31:46 -0500
Woops. 100-500, not 5000. 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com
/archives//html/Amps/2000-03/msg00597.html (7,869 bytes)

5. [AMPS] Chokes (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 12 Mar 2000 08:31:46 -0500
That isn't true. The resonant frequency varies greatly with capacitance, and how that capacitance is distributed. Even what the choke is around changes the resonant frequency. Physically small chokes
/archives//html/Amps/2000-03/msg00598.html (8,235 bytes)

6. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Sun, 12 Mar 2000 07:08:18 -0700
Yet another pontification. The smaller choke in the 8169 amp photo on my Web site has 65uH. It is resonant c. 30MHz.. By measuring choke resonances with a dipmeter, I found that distributed C varies
/archives//html/Amps/2000-03/msg00599.html (9,297 bytes)

7. [AMPS] Chokes (score: 1)
Author: philk5pc@tyler.net (Phil Clements)
Date: Sun, 12 Mar 2000 11:15:28 -0600
The choke sold by RF Parts Co. and Ameritron has been a "God-send" to me in the last few amps I have built. I tried several other things over the years; using two chokes and switching one in and out
/archives//html/Amps/2000-03/msg00601.html (9,472 bytes)

8. [AMPS] Chokes (score: 1)
Author: wc6w@juno.com (Radio WC6W)
Date: Sun, 12 Mar 2000 12:41:42 EST
A data point for the choke discussion: An article by Bill Deane in "73 Magazine", September 1969, p. 147 describes a 90 uH choke with a (first) resonance at 43 Mhz. The cogent details, to save every
/archives//html/Amps/2000-03/msg00603.html (8,653 bytes)

9. [AMPS] Chokes (score: 1)
Author: philk5pc@tyler.net (Phil Clements)
Date: Sun, 12 Mar 2000 12:50:22 -0600
Hi Marv, and everybody, I ran this article by the reflector a couple of years ago. Very interesting. I saw a 3-30 mhz Harris amp some years back with an unbelievably short plate choke in it. (about
/archives//html/Amps/2000-03/msg00604.html (9,281 bytes)

10. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Sun, 12 Mar 2000 11:18:59 -0700
My guess is that a gap would work if it was about 10-inches. Mounting chokes at right angles seems to work better and save space. A switched vacuum relay to short the larger choke as needed would un
/archives//html/Amps/2000-03/msg00605.html (10,169 bytes)

11. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Sun, 12 Mar 2000 11:19:04 -0700
With an air core, a 90uH choke resonates in the neighborhood of 20MHz. Ferrite cores have a well-deserved reputation for saturating in actual use. . The Collins antenna tuner used in the B-52 had a
/archives//html/Amps/2000-03/msg00606.html (9,311 bytes)

12. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Sun, 12 Mar 2000 11:30:15 -0700
Air core HV-RFCs never saturate. Air cores never conduct. Most of the articles I have read that use ferrites do the testing at around 5w. . Presumably, a ferrite core HV-RFC works ok in 5w amplifier
/archives//html/Amps/2000-03/msg00607.html (9,980 bytes)

13. [AMPS] Chokes (score: 1)
Author: philk5pc@tyler.net (Phil Clements)
Date: Sun, 12 Mar 2000 14:02:15 -0600
This works great, but expensive and chassis-consuming. Henry and Creative Electronics deal with this on their 3CX3000A7 amps with open-frame relays to short out the larger choke below 40 meters. Cre
/archives//html/Amps/2000-03/msg00608.html (9,633 bytes)

14. [AMPS] Chokes (score: 1)
Author: w6ru@lightspeed.net (Terry Gaiser - W6RU)
Date: Sun, 12 Mar 2000 16:22:02 -0800
I agree with Phil on this choke ... as he stated. It has worked very well for me on a couple projects. Terry W6RU over -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesti
/archives//html/Amps/2000-03/msg00610.html (10,906 bytes)

15. [AMPS] Chokes (score: 1)
Author: wc6w@juno.com (Radio WC6W)
Date: Sun, 12 Mar 2000 21:19:20 EST
Hi Rich, use. . The winding used, in the cited example, calculates to be approx.12uH without the ferrite core. This gives an effective permeability of about 7&frac12; for the core, and while the arti
/archives//html/Amps/2000-03/msg00612.html (9,887 bytes)

16. [AMPS] Chokes (score: 1)
Author: wc6w@juno.com (Radio WC6W)
Date: Sun, 12 Mar 2000 21:19:20 EST
On Sun, 12 Mar 2000 12:50:22 -0600 "Phil Clements" <philk5pc@tyler.net> writes: Hi Phil, interesting. their Your posting likely predates my "membership" in this group. I was aware of the B&W's but, c
/archives//html/Amps/2000-03/msg00613.html (10,046 bytes)

17. [AMPS] Chokes (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 13 Mar 2000 10:21:47 -0500
Hi Marv, Heating is always more of a problem than saturation, because of the finite Q of soft-iron cores. The usual exception is pulse duty. Most off the shelf rods have too much loss tangent at HF.
/archives//html/Amps/2000-03/msg00627.html (9,901 bytes)

18. [AMPS] Chokes (score: 1)
Author: Peter_Chadwick@mitel.com (Peter Chadwick)
Date: Mon, 13 Mar 2000 15:52:15 -0000
Very true. I've seen a ferrite cored plate choke used in a commercial 100 watt 2-6146PA. It was rapidly changed in production to a conventional 1 millihenry RFC because: a. that was cheaper b. it per
/archives//html/Amps/2000-03/msg00629.html (8,681 bytes)

19. [AMPS] Chokes (score: 1)
Author: wc6w@juno.com (Radio WC6W)
Date: Mon, 13 Mar 2000 13:23:54 EST
On Mon, 13 Mar 2000 10:21:47 -0500 "Tom Rauch" <w8ji@contesting.com> writes: Hi Tom, Yes, which certainly disqualifies them for a hi power resonant circuit. The article described a loosely coupled no
/archives//html/Amps/2000-03/msg00637.html (9,708 bytes)

20. [AMPS] Chokes (score: 1)
Author: 2@vc.net (measures)
Date: Mon, 13 Mar 2000 10:30:18 -0700
Mr. Rauch -- Please explain the difference between ''varying'' and ''time-varying"". thanks amen, Tom. And, as an added bonus, sellers of ferrite materials typically have better specs. .than manufac
/archives//html/Amps/2000-03/msg00638.html (10,248 bytes)


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