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21. [Amps] QSK-5 (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 12 Dec 2002 01:00:41 -0600; Key 2 has 5 vdc on it and will supply 1 ma of current to ground when pulled low. This is the line that must be pulled low (>2vdc) to place the QSK switch in the transmit mode during QSK operation. Ke; /archives//html/Amps/2002-12/msg00171.html (7,666 bytes)
22. [Amps] Neutral vs Ground Connection for 220 VAC (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 12 Dec 2002 11:17:01 -0600; A current sensor could be installed on the safety ground wire where it exits the breaker panel. This could trigger a 6 inch fire alarm gong and red strobe light so that the ham shack can be evacuate; /archives//html/Amps/2002-12/msg00176.html (8,344 bytes)
23. [Amps] AIR DUX rating (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 16 Dec 2002 13:05:04 -0600; Rating will be much different above 40 meters than below. What band(s) are you interested in? (((73))) Phil, K5PC; /archives//html/Amps/2002-12/msg00214.html (6,814 bytes)
24. [Amps] re: Magic values for "Glitch" Resistors in HV Pwr Sply (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 22 Dec 2002 12:47:18 -0600; You are painting with too broad a brush. It depends upon several factors. Eimac and others specify the maximum joules allowed for each specific tube model, so that is the starting point in "doing th; /archives//html/Amps/2002-12/msg00242.html (9,536 bytes)
25. [Amps] re: Magic values for "Glitch" Resistors in HV Pwr Sply (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 22 Dec 2002 13:34:09 -0600; What is your tube line-up? Also, your fuses/c.b.'s to the primary of the HV transformer must be properly sized so as to not trip on normal peak loads, but to trip ASAP during a fault. My 8877amps th; /archives//html/Amps/2002-12/msg00243.html (8,344 bytes)
26. [Amps] (no subject) (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 27 Dec 2002 12:13:57 -0600; Rich's advice was very sound, as usual. Energize your T-R switch with all other voltages killed to the amp. Make sure you have continuity from the tank side of the blocking cap to the RF output jack; /archives//html/Amps/2002-12/msg00298.html (7,724 bytes)
27. [Amps] who makes the best? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 27 Dec 2002 23:26:59 -0600; Since you placed no restrictions, I would say it is a toss-up between Henry and Harris. If you have copied a W1AW transmission in the last 10 years, you are listening to a Harris. My view has always; /archives//html/Amps/2002-12/msg00302.html (7,303 bytes)
28. [Amps] Dow-Key Coaxial Relays` (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 4 Nov 2002 15:18:05 -0600; A good point was made today re the Dow-Key relays found in Harris equipment et al. The cap on the end of the relay for inspection and cleaning purposes is far from air-tight. A lot of the Harris equi; /archives//html/Amps/2002-11/msg00026.html (7,298 bytes)
29. [Amps] troubleshooting a sb200 (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 5 Nov 2002 12:45:03 -0600; Go to www.harbachelectronics.com , Click on SB200 You will see the replacement power module and soft-start kit. Phil, K5PC; /archives//html/Amps/2002-11/msg00040.html (7,096 bytes)
30. [Amps] SB220 T/R relay substitution (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 14 Nov 2002 12:33:26 -0600; I own a Heath SB220 which I have modified and improved in many ways over the years, but I have never dealt with the slow, noisy T/R relay. Does anyone have any experience substituting a relay that is; /archives//html/Amps/2002-11/msg00226.html (8,171 bytes)
31. [Amps] Hot Switching (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 15 Nov 2002 00:41:33 -0600; It sure is, Jim. Hot switching is occurring from the time RF leaves the transceiver until the T-R relay in the amp is fully thrown. The amount of RF and the number of repetitions are accumulative in; /archives//html/Amps/2002-11/msg00234.html (7,790 bytes)
32. [Amps] 8877 - Which Bias voltage ? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 15 Nov 2002 15:26:24 -0600; I have converted several of these. If you remove the choke, add 30 mfd or so filter capacitor, and step-start, you will be able to set the taps on the HV transformer to 4 kv under load. You will the; /archives//html/Amps/2002-11/msg00262.html (8,694 bytes)
33. [Amps] more on the HFS1000G RFPP amplifier (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 18 Nov 2002 17:31:51 -0600; This would work fine, Rich. The choke is very robust in this generator. However, I prefer to add the step-start and additional filter C in the vast cavern left by removing the choke, and taking adva; /archives//html/Amps/2002-11/msg00318.html (7,418 bytes)
34. [Amps] more on the HFS1000G RFPP amplifier (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 18 Nov 2002 17:35:42 -0600; There is a nice 10 ohm 100 watt glitch resistor already in the power supply box, John. Also there is electronic current sensing on the cathode line. Either of these will pop the 20 amp breakers nice; /archives//html/Amps/2002-11/msg00319.html (7,635 bytes)
35. [Amps] Pi-networks (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 21 Nov 2002 22:34:41 -0600; Hello, Carl.. There is a nifty disk that came with the ARRL Handbook that deals with Pi, Pi-L, and input Pi networks, based on the universally accepted formulas by W5FD. You just enter your values, a; /archives//html/Amps/2002-11/msg00337.html (7,828 bytes)
36. [Amps] gg input (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 11 Oct 2002 12:36:23 -0500; If the input Q is too high (over 2 or so) you cannot cover the entire band with fixed components. (((73))) Phil, K5PC; /archives//html/Amps/2002-10/msg00106.html (6,673 bytes)
37. [Amps] 3CX3000F7 idle current (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 21 Oct 2002 10:33:15 -0500; plate my zero signal plate current is 500 mills. Should I be adding a little bias to bring it down a bit? Ken...I would bring it down to c. 350 ma. This will reduce the heating of the ham shack, and; /archives//html/Amps/2002-10/msg00225.html (6,887 bytes)
38. [Amps] Amps to make (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 9 Sep 2002 12:33:56 -0500; A single YC-156 will out-smoke any of the above. Requires no socket, heater is 15 volts @ 15 amps. Generally same specs as 3CX15000B7, except that the anode cooling fins are smaller. MRI pulls show; /archives//html/Amps/2002-09/msg00060.html (6,825 bytes)
39. [Amps] B&W 851 (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 9 Sep 2002 20:32:14 -0500; Hi Dick, and other interested Ampers, The B&W 851 is rated for 500 watts peak SSB and CW. If you look at the puny coils in many modern amps that profess to be 1500 watts, you will see that the 851 r; /archives//html/Amps/2002-09/msg00065.html (7,045 bytes)
40. [Amps] Heising Choke (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 17 Sep 2002 16:52:51 -0500; Hi Carl, and other Old Timers! I am just getting the tears wiped from my eyes enough to respond! We teenagers in the '50's could not afford full-blown class-B modulators. Mr. Heising provided a way f; /archives//html/Amps/2002-09/msg00117.html (7,970 bytes)

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