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Total 238 documents matching your query.

1. [Amps] Input Z for 2xGI7b (score: 1)
Author: Johnnie Walker <keepwalking188@yahoo.com>
Date: Sun, 25 Jan 2009 18:03:19 -0800 (PST)
Gentlemen, What's the concensus on the input resistance of a pair of GI7b? For the resistive component, I've seen numbers in quite a wide range - from 30-145 ohms. That's quite a spread! I was hoping
/archives//html/Amps/2009-01/msg00291.html (6,542 bytes)

2. Re: [Amps] Input Z for 2xGI7b (score: 1)
Author: Johnnie Walker <keepwalking188@yahoo.com>
Date: Mon, 26 Jan 2009 11:03:27 -0800 (PST)
Thank you very much Peter for your advice. 73/jeff/ac0c therefore two tubes should grid [mailto:amps-bounces@contesting.com] On pair of GI7b? quite a wide range - from more closely for the design the
/archives//html/Amps/2009-01/msg00305.html (8,757 bytes)

3. Re: [Amps] Crydom Solid State Relays (score: 1)
Author: Johnnie Walker <keepwalking188@yahoo.com>
Date: Thu, 29 Jan 2009 10:46:00 -0800 (PST)
Hi Paul, What would be typical values for the cap/res combo? 73/jeff/ac0c make your own using 630wvdc you in right direction <amps@contesting.com>; capacitor R/C combo that need RFI protection! snubb
/archives//html/Amps/2009-01/msg00351.html (13,792 bytes)

4. Re: [Amps] Open letter (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sat, 28 Feb 2009 12:46:33 -0600
Gentlemen, For context, let me say that I am a sales and management teams trainer by profession, and an engineer by training. Which means that I do have long experience from both the viewpoints of sa
/archives//html/Amps/2009-02/msg00726.html (10,552 bytes)

5. Re: [Amps] Open letter (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sat, 28 Feb 2009 13:25:20 -0600
Steve, I agree with your expectation. But the problem with these custom projects is that they are a moving target some of the times and hard to nail down on the cost side until it's time to pull the
/archives//html/Amps/2009-02/msg00732.html (14,940 bytes)

6. Re: [Amps] Transformer Update (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sat, 28 Feb 2009 13:27:50 -0600
In a word of instantanious pulsed peak power characterizations, serious iron for serious duty cycle applications (RTTY or AM) is hard to come by. And while this may be overkill for the average guy, I
/archives//html/Amps/2009-02/msg00733.html (11,514 bytes)

7. Re: [Amps] QRO HF-2500DX on 10.1 MHz (Proper title!) (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sat, 28 Feb 2009 13:30:57 -0600
Fern, If you run much RTTY, you can appreciate the hammering running full out on that band can do to a rig barefoot... I would be very interested to see what the answer comes up to be as well. Most a
/archives//html/Amps/2009-02/msg00734.html (10,029 bytes)

8. Re: [Amps] Open letter (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sat, 28 Feb 2009 15:21:18 -0600
My apologies to Carl. I had inadvertently swapped his name and Steve's in my reference below. I guess the words "open reply to steve cook" were the equivilant of looking for sox in the sox drawer. My
/archives//html/Amps/2009-02/msg00740.html (16,416 bytes)

9. [Amps] silver mica assortment - where to source? (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sun, 01 Mar 2009 11:25:57 -0600
Gentlemen, To restock my badly suffering junkbox, I am on the hunt for a wide assortment of silver mica caps. Wondered if anyone had a good place to buy these. A lot of guys like Surplus Sales has a
/archives//html/Amps/2009-03/msg00015.html (6,901 bytes)

10. Re: [Amps] GI7B Max Plate and Grid Current?? (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Mon, 02 Mar 2009 14:02:55 -0600
Scott, You are right. The data out on the GI7B is hard to come by. The Pd max of the GI7b is 7w. But I've not been about to find a set of curves that reflects the common set of op conditions which ma
/archives//html/Amps/2009-03/msg00069.html (10,613 bytes)

11. Re: [Amps] SWR & other things... (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 03 Mar 2009 22:38:16 -0600
The MFJ 998 is a real workhorse in my application. I use it with resonant anteannas to allow off-resonance operation and have it located pretty close to the antenna so most of my coax run is into a f
/archives//html/Amps/2009-03/msg00107.html (8,724 bytes)

12. [Amps] QRO 2500 with really really hot tank toroid (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Sun, 08 Mar 2009 00:20:48 -0600
A buddy of mine has a QRO 2500DX (runs the pair of x800s). Has worked fine for last 10 years. And in the last month, the toroid that serves the 40/80/160m tank has started to get extreemly hot. At on
/archives//html/Amps/2009-03/msg00238.html (7,220 bytes)

13. Re: [Amps] HV measurements (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 10 Mar 2009 02:42:05 -0500
Guys, There is a guy selling the 6KV Fluke probe together with a 27FM which is the mil-spec version of this meter. True RMS - great for reading fil voltages. $70 incluidng the hard-case. Bought one f
/archives//html/Amps/2009-03/msg00270.html (9,395 bytes)

14. Re: [Amps] Choosing a Plate Transformer (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 10 Mar 2009 10:49:00 -0500
Hi Scott, Right. The total power drawn must equal the total power input. So a doubler needs 2x the current (on average) in exchange for the magic of doubling. And consider that the plate voltage load
/archives//html/Amps/2009-03/msg00277.html (9,439 bytes)

15. Re: [Amps] Choosing a Plate Transformer (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 10 Mar 2009 11:02:36 -0500
Hi Richard, I'm curious what you base that on? 73/jeff/ac0c _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00278.html (10,354 bytes)

16. Re: [Amps] HV measurements (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 10 Mar 2009 18:50:23 -0500
Several guys sent me seperate messages asking who the ebay guy was. Here: http://cgi.ebay.com/FLUKE-27-FM-MULTIMETER-W-80K-6-HIGH-VOLTAGE-PROBE-MINT_W0QQitemZ260374448468QQcmdZViewItemQQptZLH_Default
/archives//html/Amps/2009-03/msg00298.html (11,027 bytes)

17. Re: [Amps] Choosing a Plate Transformer (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Tue, 10 Mar 2009 17:33:59 -0500
Scott, I have a pair of GI7B with custom heat sinks (the stock sinks are not very efficient) - so it's a more or less optimized setup for allowing running near the high end of the anode dis max. Coup
/archives//html/Amps/2009-03/msg00313.html (20,500 bytes)

18. [Amps] Odd efficiency shift on 80m band (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Wed, 11 Mar 2009 15:35:15 -0500
Gentlemen, 2xGI7B HB amp. Shows a funny efficiency shift on the 80m band and I was hoping that some of the more experienced hands on the board may have seen something like this before.... On the top
/archives//html/Amps/2009-03/msg00321.html (7,985 bytes)

19. Re: [Amps] Odd efficiency shift on 80m band (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Wed, 11 Mar 2009 16:12:03 -0500
Thanks to the several guys who have asked a few additional questions. Please find the answers here: 1. Actual data taken just now (indicated SWR on the rig side 1.15-1.25 range): 4.00 mhz 73w drive P
/archives//html/Amps/2009-03/msg00324.html (10,353 bytes)

20. Re: [Amps] Odd efficiency shift on 80m band (score: 1)
Author: Jeff Blaine <keepwalking188@yahoo.com>
Date: Wed, 11 Mar 2009 16:36:56 -0500
Hi Don, Thank you for pointing this out. And I agree with your point that 80m shares the largest percentage change of all the bands. What I'm really after here is to discover possible additional sour
/archives//html/Amps/2009-03/msg00326.html (9,706 bytes)

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