steve_qix
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« on: April 08, 2018, 09:10:42 PM » |
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So, here's the problem.... Wayne WA1SSJ built a (very amazingly beautiful) 24 FET transmitter. Pics of the rig are forthcoming when Wayne finishes with the labels. However, back to the point - we needed to test the rig. Wayne brought the whole thing to my place, and I ran an exhaustive battery of verifications and tests on the RF deck and pulse width modulator. Needless to say _everything_ performed flawlessly right out of the box. However, the transmitter, built of course correctly by Wayne had a nice 240V plug on the end - and of course I have not matching 240 volt outlet. Undaunted, the next best approach to the problem was brought to bear. And here is the result. Of course this definitely meets the N.E.C. (and if you believe THAT one, I've got a bridge for sale over in NY).
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PA0NVD
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Nico and Chappie (Chappie is the dog...)
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« Reply #1 on: April 08, 2018, 09:17:24 PM » |
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The only problem I see it that it seems that the isolation bar of the left switch is reversed and should be mechanically linked to the right switch...The rest is ok
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KB2WIG
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« Reply #2 on: April 08, 2018, 09:22:38 PM » |
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I always tape the clip leads so they won't come loose or short things out. Safety matters.
klc
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What? Me worry?
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steve_qix
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« Reply #3 on: April 08, 2018, 09:26:57 PM » |
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The only problem I see it that it seems that the isolation bar of the left switch is reversed and should be mechanically linked to the right switch...The rest is ok Ah, very observant The right switch switches between 240V (up) and 120V (down). The left switch selects between direct to the power source (up) and using the Variac (down).
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WD5JKO
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WD5JKO
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« Reply #4 on: April 08, 2018, 11:09:00 PM » |
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I was at a fellow ham QTH last month. Same thing; 230v cheater cord with alligator clips to a power cord! I objected and he finally put insulation over the gators.
Jim Wd5JKO
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WD8KDG
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« Reply #5 on: April 09, 2018, 08:18:50 AM » |
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How much are you asking for the bridge? Craig,
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Ham radio is now like the surprise in a box of "Cracker-Jacks". There is a new source of RFI every day.
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Todd, KA1KAQ
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« Reply #6 on: April 09, 2018, 09:28:32 AM » |
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I dunno, Steve - even the QIX Memorial Clip Lead Museum has a ways to go to beat this guy.
Adds a whole new meaning to the phrase "I just threw this together on the bench"....
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known as The Voice of Vermont in a previous life
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KD6VXI
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« Reply #7 on: April 09, 2018, 10:14:07 AM » |
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Some nice inductors in that pic.
I'm confused though. Wouldn't it make more sense to hang the tubes in the window, rather than that huge inductor?
I mean, air cooling that inductor seems unnecessary. The tubes, though.
At least he's got them mounted up high where the air is stale and at its hottest temp!
--Shane KD6VXI
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w1vtp
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« Reply #8 on: April 13, 2018, 10:39:48 AM » |
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I was there. The clip lead wires were BARELY warm. Attribute that the very high efficiency of the class E transmitter
Al
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KA0HCP
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« Reply #9 on: April 14, 2018, 02:40:01 PM » |
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Yes, it meets N.E.C. (No electrical codes)!
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New callsign KA0HCP, ex-KB4QAA. Relocated to Kansas in April 2019.
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W1DAN
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« Reply #10 on: April 15, 2018, 06:53:56 PM » |
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Radio Shack leads?
Those could have been used as a "soft start" circuit! ;-)
Dan
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n1ps
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« Reply #11 on: April 15, 2018, 07:48:47 PM » |
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First seeing the photo I thought this was the new QIX self driving car remote control.
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VE3ELQ
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« Reply #12 on: April 15, 2018, 08:04:36 PM » |
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John 11 : 35
Nigel
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A "Tube Free" zone.
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steve_qix
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« Reply #13 on: April 17, 2018, 08:51:44 PM » |
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John 11 : 35
Nigel
Shortest verse in the Bible
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w1vtp
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« Reply #14 on: April 19, 2018, 04:02:31 PM » |
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John 11 : 35
Nigel
Shortest verse in the Bible There was no weeping at the QIX lab
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KD6VXI
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« Reply #15 on: May 06, 2018, 05:06:27 PM » |
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My version.
Feeding 126 into low tap, on 208.
Measuring off 5 of 20 caps, so quadruple the meter reading.
Then double it for the nominal 252 volts in summer.
7300 volts ought to really get a pair of 4x1s cooking!
But yeah, all the interconnects meet code!
Time to go buy another cutting board...... Err..... Shelf! Yes, time to go buy another shelf!
--Shane KD6VXI
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KD6VXI
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« Reply #16 on: May 06, 2018, 06:51:04 PM » |
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There. Multiplier isn't shown, but where I'm picking the voltage up is X8.
I'm Sure THIS meets code. 8.8 kv, through clip leads!
Viva LA 4-1000s!
--Shane KD6VXI
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KB2WIG
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« Reply #17 on: May 06, 2018, 08:37:09 PM » |
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The wonders from Wally Mart.
I like the 'ease of sliding' hand hole in the shelf..... Its a much better application than the Batwings "works in a drawer".
It does look suspiciously like the center insulator of my 80m/40m "fan" dipole.
klc
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What? Me worry?
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W1RKW
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« Reply #18 on: May 07, 2018, 04:56:23 PM » |
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Shane, I'm surprised you didn't fry that DMM.
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Bob W1RKW Home of GORT.
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KD6VXI
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« Reply #19 on: May 07, 2018, 06:05:36 PM » |
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It's rated to 1kv.
I did fry the same model a week before. Hit the variac switch and had 60 volts or so into the primary of a 4.4kv xformer. So, about 2kv....
Thank gosh they are only 30 bucks! Compare within 2 pct of my 600 dollar fluke. And read to 200 uF and 30 mhz
--Shane KD6VXI
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