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eHam Forums / Elmers / RE: Balun 1.1
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on: May 20, 2013, 10:09:53 AM
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It was recommend for my G5RV ..I asked before i bought it was told it would work great it didn't threw my swr all over the place basically UN usable a lest for me thanks for the info ..
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5
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eHam Forums / Elmers / RE: SSB filters for ic-718
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on: May 12, 2013, 08:28:10 AM
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I wish i had read this before i bought the W4RT ssb filter waste of time and money in my 718 when compared to the stock filter no different.....
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6
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eHam Forums / Antennas and Towers and more / RE: g5rv or ZS6BKW
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on: May 11, 2013, 09:34:06 AM
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Very interesting my ZS6BKW ... has a better match every were but 80 meter were it's very bad...
That is a feature of the design. The G5RV design should give a reasonable match on 80, 40, 20 and 12m. The ZS6BKW was designed to give a better match on more bands, but 80m was not one of them. I kind of knew that but was hoping it would have been better on 80 meters its un readable with my lg-100a ......But 40,20,17,10, match up great with the ZS6BKW |
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eHam Forums / Antennas and Towers and more / RE: g5rv or ZS6BKW
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on: May 10, 2013, 04:04:44 PM
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I have both took the g5rv down and put up the zs6bkw and it match better every were but 80 meter ... Here's my SWRs for my ZS6BKW. On 80m, I have a 500pf series doorknob capacitor on the coax side of the 1:1 choke. That cap is shorted out on all bands except 80m. 3.85 MHz, 2:1 7.05 MHz, 1.3:1 14.175 MHz, 1.4:1 18.14 MHz, 3.2:1 24.95 MHz, 1.8:1 28.4 MHz, 6:1 29.3 MHz, 1.1:1 Very interesting my ZS6BKW (w8amz) is far better made than my mfj g5rv and has a better match every were but 80 meter were it's very bad i will give your idea a try cause in the end i think the zs6bkw is a better wire ......thanks |
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8
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eHam Forums / Antennas and Towers and more / g5rv or ZS6BKW
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on: May 09, 2013, 05:55:23 PM
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I have both took the g5rv down and put up the zs6bkw and it match better every were but 80 meter which i use a fair bit over 10.1 ..I put my G5RV back up but changed the ladder line to 300 ohm now i get this i never use 10 meter is it worth put the zs6bkw back up it match a little better on a few of the other band but not bye much thanks
3.729 --1.69
3.968--3.60
7.055 -- 1.92
7.268-- 1.73
14.200--3.95
14.300--4.65
18.300--4.73
18.100--5.47
28.665--5.59
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12
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eHam Forums / Amplifiers / RE: Sb-200 no plate current at idling
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on: April 14, 2013, 11:03:53 AM
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I have all the mods done to mine and am getting 80 ma at idling
I would not get in a twist on 80 vs 90ma idle key down no signal as it is not rocket science and meter accuracy and/or line voltage can easily account for this too. I would worry more about high idle current than low. The higher the current the higher the zero signal plate dissipation. Oh i am fine were it is manual said 90 ma i get 80 ma and my amp is working great .. |
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13
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eHam Forums / Amplifiers / RE: Sb-200 no plate current at idling
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on: April 14, 2013, 09:10:43 AM
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Now I'm confused. My SB 200 has no GRID current at idling and exciting it with the FT 950 at 35 watts out in CW mode, the grid current reading goes negative. That is, it dips below zero. Plate current reads abt 300ma, and HV at idle abt 2300, during transmit drops to around 1800 best I can remember. It has the Harbach mods, all of 'em. Wouldn't think the Harbach mod which replaces the original 2K 7 watt R18 with a 4.7K 5 watt would do that to the grid current, BWDIK.
I have all the mods done to mine and am getting 80 ma at idling |
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14
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eHam Forums / Amplifiers / RE: Sb-200 no plate current at idling
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on: April 01, 2013, 02:58:35 PM
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When you key the amplifier the cutoff bias is reduced (-145 Vdc to -7 Vdc ) and the tubes should draw some current (60-80 mA). This depends on the diode string or Zener that has been placed into the circuit.
Some meters will just barely move with such low current.
\ Thank you very much i did not realize i had to key the amp the manual just said with no driver output from the exciter ..........Now shows 85 +- ma with no drive in ssb mode idling ......thanks again my green horn is showing |
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15
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eHam Forums / Amplifiers / Sb-200 no plate current at idling
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on: April 01, 2013, 12:12:14 PM
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First Amp i have ever owned seems to work fine puts out 500 watts on 80 meters same on 40 with about 70 watts of drive but the manual states there should be about 90 ma idling ............Thanks
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