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Total 80 documents matching your query.

1. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Eric Moore" <emoore@windemullerelectric.com (Eric Moore); Date: Thu, 1 Feb 2001 16:36:56 -0500; In the May 1989 QST article http://www.arrl.org/tis/info/pdf/sstrans.pdf and a thread a few months back, a good modification to make (lets not debate the fact again, as it may not really be required,; /archives//html/Amps/2001-02/msg00037.html (8,922 bytes)
2. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: billp@wwpc.com (Bill Putney); Date: Thu, 1 Feb 2001 14:07:53 -0800 (PST); Eric, My Henry 2KD-2 doesn't have a standby switch either. Also the relay driver in my exciter is a transistor which would marginally drive the keying relay in the PA. I solved the problem by getting; /archives//html/Amps/2001-02/msg00038.html (11,097 bytes)
3. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 01 Feb 2001 17:25:52 -0500; in the the the from the Ah, so the idea is to leave the filaments on while transmitting through but not using the amp. Got it. In that case, I'd suggest that instead of using a relay to switch the ke; /archives//html/Amps/2001-02/msg00039.html (10,305 bytes)
4. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Thu, 1 Feb 2001 19:43:34 -0500; Eric, If you really want to do it the best way is to replace the rel. output sensitivity pot with a pot that has a built in on/off switch. Then wire the switch in series with the wire going to the re; /archives//html/Amps/2001-02/msg00044.html (10,634 bytes)
5. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: realex@flash.net (Bob Alexander); Date: Thu, 1 Feb 2001 19:37:17 -0600; Eric, Hardwire the cw/ssb switch in the SSB position and use the switch as your standby switch. Bob, W5AH In the May 1989 QST article http://www.arrl.org/tis/info/pdf/sstrans.pdf and a thread a few m; /archives//html/Amps/2001-02/msg00045.html (9,785 bytes)
6. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 2 Feb 2001 09:17:30 +0100; If you can adjust driving power to obtain the desired out, the CW position becomes basically meaningless, expecially if considering that tubes work better at 3Kv plate voltage. Anyway, to realize a S; /archives//html/Amps/2001-02/msg00047.html (10,055 bytes)
7. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Fri, 2 Feb 2001 01:03:41 -0800; Amen With modern radios, there is no difference in delay between SSB VOX, SSB PTT and CW. The net result is typically hotswitching, The fix is to use a npn transistor switch in place of a convention; /archives//html/Amps/2001-02/msg00049.html (11,790 bytes)
8. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 2 Feb 2001 09:13:55 -0000; It's a good idea - I've done something similar for the antenna selection and auto antenna tuner control - but Bill, how do you get it all in one box? I've got two matching boxes about 12 inches wide; /archives//html/Amps/2001-02/msg00050.html (9,361 bytes)
9. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Fri, 2 Feb 2001 01:28:00 -0800; The 3-500Z is instant-heat. The problem with switching the 220 off and on is too much peak current for the on/off switch. see Step-start circuit (Figure 1) on my Web site. I agree that a totally unn; /archives//html/Amps/2001-02/msg00051.html (10,257 bytes)
10. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Fri, 2 Feb 2001 01:28:02 -0800; CW has c. 2x the duty-cycle of SSB. The SB-220's HV transformer is too light for CW on the SSB tap. The same thing is true for the TL-922. ciao, Mauri. - Rich..., 805.386.3734, www.vcnet.com/measure; /archives//html/Amps/2001-02/msg00052.html (9,581 bytes)
11. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 2 Feb 2001 11:11:59 +0100; that too Reducing the drive power and consequently the output power, the RMS developed for a stated duty cycle is accordingly reduced. Ciao, Rich 73, Mauri -- FAQ on WWW: http://www.contesting.com/F; /archives//html/Amps/2001-02/msg00053.html (9,914 bytes)
12. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: da_kang@hotmail.com (Jeff Wolf); Date: Fri, 02 Feb 2001 14:03:06; This is bad advice. The SB220 should ALWAYS be started in the CW position to limit inrush current. NEVER start the SB220 in the SSB position, as it puts too much strain on components. The best idea; /archives//html/Amps/2001-02/msg00056.html (9,949 bytes)
13. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 02 Feb 2001 09:35:20 -0500; Never heard this before. I never do it this way. Don't think it's really a problem. But I do agree, the best cosmetic and operational solution is to use the push-pull switch on the sensitivity pot. 7; /archives//html/Amps/2001-02/msg00057.html (9,899 bytes)
14. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 2 Feb 2001 09:41:28 -0600; Correct. Better efficiency, and less drive required. Correct again. The "CW" position was to meet the old FCC rules of "1kw INPUT." The switch makes a dandy standby switch, and allows restoration to; /archives//html/Amps/2001-02/msg00058.html (10,132 bytes)
15. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: da_kang@hotmail.com (Jeff Wolf); Date: Fri, 02 Feb 2001 15:44:39; Has been discussed on this list a few times. You don't believe starting an amplifier that has no step start on the higher voltage portion of the transformer to be a problem? Think about it. Less win; /archives//html/Amps/2001-02/msg00059.html (10,431 bytes)
16. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: da_kang@hotmail.com (Jeff Wolf); Date: Fri, 02 Feb 2001 15:49:07; As well as the efficiency of the amplifier. Toll Free _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com -- FAQ on WW; /archives//html/Amps/2001-02/msg00061.html (9,407 bytes)
17. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: billp@wwpc.com (Bill Putney); Date: Fri, 2 Feb 2001 10:01:36 -0800 (PST); One last comment on this subject. I can appreciate the hot switching problem but the reason I put up with a little longer pickup delay is that the keying transistor in my exciter would not quite driv; /archives//html/Amps/2001-02/msg00064.html (12,400 bytes)
18. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: billp@wwpc.com (Bill Putney); Date: Fri, 2 Feb 2001 10:03:41 -0800 (PST); The box I got for this project is dimentonally transendental... It's bigger on the inside than it is on the outside. - Bill -- == == -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amp; /archives//html/Amps/2001-02/msg00065.html (10,488 bytes)
19. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Fri, 2 Feb 2001 19:47:32 +0100; Hi Jeff, I'm sorry to correct you but gain and efficiency increase, although this is not the original point. 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contes; /archives//html/Amps/2001-02/msg00066.html (10,305 bytes)
20. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Fri, 2 Feb 2001 10:45:12 -0800; ? Unfortunately, SB-220 on/off switches fail in CW or SSB position. What is needed is a Stepstart. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/a; /archives//html/Amps/2001-02/msg00067.html (9,750 bytes)

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