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Re: Ham Radio Magazine
Hsu
开云体育Hi, David,
? Do you have the Ham radio Dec 1977
P38-43,?J.H. Bowen "Accurate Low
Power RF?Wattmeter?for High
Freqency?and VHF Measurements"?
? Thanks!
????? 73!Hsu
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Re: Ham Radio Magazine
David C. Hallam
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Re: 8170 AMP
Steve Cook
80 thru 10 actually... but I ran it mostly on 40 meters in the combat zone.? It was able to produce a 40dB over S-9 signal on 40 meters from Tucson, AZ?into Somis, CA... ? Amazing... ? -S Phil Clements wrote:
Any questions? Get answers on any topic at . Try it now. |
Re: 8170 AMP
Steve Cook
Hi Greg, ? To be honest, I don't recall ever running this thing on 10 or 15, although the grid circuit did resonate nicely.??I used the AG6K circuit which incorporates a trifilar input transformer and a 450 non-inductive resistor in conjunciton with a roller coil to resonate the input cirucit.? This thing put out a heap of fire -- 20dB and change. ? -S badgerscreek wrote:
Cheap Talk? Yahoo! Messenger's low PC-to-Phone call rates. |
Re: grid driven tetrode
On Jan 5, 2007, at 6:22 PM, FRANCIS CARCIA wrote:
Correct. AB1 means the grid is never driven into positive region. Sure, it sounds strange to say the maximum grid potential is 0 volts, but it's true. or let the plate voltage swing below the screen for cleanest output?For a pentode, the minimum anode potential can swing slightly below the screen potential with no problem, but with a tetrode, the screen current - as well as total IMD - goes through the roof when the anode potential dips below the screen V. Thus for AB1 SSB, use an abundance of anode V. plus the max screen V. Any feel for the output power limit for say a 4CX3000A holding that operating condition? gfzPlywood Box #2 would do c. 8kpep out in AB1 / SSB with 1kV on the screen. ...R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org |
Re: grid driven tetrode
FRANCIS CARCIA
So Rick, Do I assume you never want to drive the grid 1 positive or let the plate voltage swing below the screen for cleanest output? Any feel for the output power limit for say a 4CX3000A holding that operating condition? gfz? R L Measures wrote:
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Re: TL-922A Owner Question
On Jan 5, 2007, at 8:22 AM, Steve Cook wrote:
Temp-proportional speed control, cost. R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org |
Re: Enough!
On Jan 5, 2007, at 7:06 AM, KR4DA wrote:
There is NO MODARATOR.Topband and AMPS have a Fuehrer-censor. R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org |
Re: grid driven tetrode
On Jan 5, 2007, at 9:21 AM, FRANCIS CARCIA wrote:
When the grid is driven positive in a grid-driven amplifier, distortion increases. ... R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org |
Re: Enough!.... final comment.
FRANCIS CARCIA
nice to?hear from?a few people with brains
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pentalab wrote:
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Re: Enough!
FRANCIS CARCIA
Hal, You are looking for crow's feet. A term used in the aircraft industry?protecting a wire?bundle goes through a bulkhead. It usually comes in 4 foot hunks. There are a number of different thicknesses. Picture a u shaped channel with square notches cut out of the two sides to let it go around the I.D. of a hole. How about McMaster - Carr? harold b mandel wrote:
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Re: Enough!.... final comment.
pentalab
--- In ham_amplifiers@..., "David C. Hallam"
<dhallam@...> wrote: for the every reasons you have pointed out in your previous emails. ### Based on what, CNN or ABC ?? You fellows are fed so much dis-information... it would be very difficult to separate wheat from chaff. Anytime you get the government involved in anything, corruption causes things togo to hell. Government is the biggest source of corruption in society. Itsurpasses individuals, businesses, and anything else you can name. God saveus from more big government. I'll take big business corruption any daycompare to big government corruption.### go see some documenataries... like "Enron".. and .."whatever happened to the electric car"... and the classic.... "Walmart"... or do they ban stuff like that from your local movie theatres ? The hidden camera scenes are worth it alone. I especially like the ones about FDA approval. The FDA doesn't test anyting at all.. they just review drug co's research findings. We elect people who think they know what is right for you. They end up knowing what is right for them.### and u voted for Bush ?? ### That little guy... think his name was Ross Perot.. or similar.... the one with all the flip charts... offered to fix ur economy for free. I woulda voted for him. What u need is a 3 x party system. name of Will Rogers. He was a Democrat and probably some what of asocialist, but one of his most famous quotes was " The people elected CalvinCoolidge president. He didn't do much, but that's what the peoplewanted." I think that's what the people in the US want today. A president andcongress that won't do much.#### Why not just put everything to a plebesite/ vote/ on line vote ? Let the people decide. Later.... Jim VE7RF
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Never Enough
Robert B. Bonner
Hal,
Go for the chrome plating... That's what I'm going to do... Bolt on a set of handlebars with PTT switch.... Pretty soon I wont be able to tell if I'm riding or radioing... Right now the blower in this thing sounds like my Harley... Either the Hog needs to be louder or the blower quieter. I haven't decided which yet. BOB DD |
Re: Enough!
Wilbert Knol
WHAT PART OF ENOUGH! DON'T YOU UNDERSTAND? Obviously, 'enough!' does not apply to yourself (aka 'the majority').I think that's what the majority would like to do. I sincerely doubt Wilbert, ZL2BSJ |
Re: Enough!
harold b mandel
Closure or cloture?
Censor or censure? At Wally World this morning I went looking for that plastic stuff that you slide on the edge of your car door to keep it from chipping paint off of other people's cars in parking lots. The stuff is clear plastic and has an opening on one edge and maybe some glue or sticky stuff to keep it on the car door. It will be used on fan openings in the power supply module and on the RF deck to finish the 4-1/2" holes, under the grilles. There was a guy with a WW badge standing at the register in the Automotive Department. I asked him if he knew where the door edge protectors might be. When he answered, "I don't have the faintest idea," I knew it was a wasted trip. He had a computer terminal right in front of him, but he probably wasn't authorized to use it. So then I went on to try and find a sandblaster and powdercoater for the cabinetry. HA! $150.00 for sand/bead blasting $175.00 for the base coat/ steel protective coating $150.00 for the finish coat This is for a 23 x 24 x 18 steel box. In New Jersey I could get this whole thing chrome-plated for $100.00, and sandblasting is included. So I figure about twelve cans of textured black Rustoleum spray at $5.17 per can ought to do it just fine. If I could find a local source of VHT Wrinkle-Black for that price I would probably go that route again. The last two chassis projects turned out just fine with wrinkle finish, and it matches the old Collins stuff just great. Hal W4HBM |
Re: Enough!
zerobeat40
I think you mean "no censorship". Censure refers to a group formally
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voting to reprimand something. Censorship is what was happening at the old group. Play nice. Z --- In ham_amplifiers@..., KR4DA <kr4da@...> wrote:
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grid driven tetrode
FRANCIS CARCIA
Anybody out there know if you get a cleaner output from a tetrode if you keep the screen high and drive G1 with low power living with the distortion produced when the plate swings below the screen OR run low screen voltage low?so the plate never swings below the screen. This means a lot more drive power and driving the G1?positive with higher?drive power. This assumes you don't go above the grid ratings in either configuration.? gfz |
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