Re: Various uses for metal tube RF amplifiers
I am sure every hospital has Scott's phone number on speed dial?? Wink Wink
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mike repinski
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#40356
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Various uses for metal tube RF amplifiers
Any of these bigger metal tube amplifiers can be used for: (A) ISM (B) educational (C) testing DL's. (D) CAP (E) MARS (F) plasma (G) sputtering (H) tube testing (I) deep tissue healing (J) diathermy
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Jim VE7RF
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#40355
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 14
HERE THE FRONT PANEL IS DONE..AND PAINTED. THE 2 LOWER TURNS COUNTERS EACH DRIVE A 6:1 VERNIER...WHICH DRIVE THE C1+C2 PI TUNED INPUT CAPS. THAT MEANS 0-300 INCREMENTS TO GET FROM MESHED TO UNMESHED.
By
Jim VE7RF
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#40354
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Re: LK-450NT
On the 374A, 10 meters is just the Load cap. Its fixed tune. So if you set the load cap to like 70 on the dial, You get instant 10, 15,20,40 and 80 with no tuning. I/we noticed the same thing on my 2x
By
W7WRX
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#40353
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Re: LK-450NT
Interestingly enough, after looking at the schematics for the 450/500/550 NT series of amplifiers,? they all use a PI network? on 160-10m.? ?BUT they use a lower, loaded Q.? ( more coil, less
By
Jim VE7RF
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#40352
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Re: LK-450NT
Checked it out. Radio - amp - swr/per meter - dummy load. All fine. He had a cluster _____ of coax, switches to switch different antennas to ??? I showed him the radio and amp are fine so he has to
By
Bob
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#40351
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Re: LK-450NT
I'll let you guys know what I find. I'll see it Tues eve. Bob W4JFA
By
Bob
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#40350
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Re: LK-450NT
That is very odd. .. I have owned several LK amps. They will cover the entire band in the No tune. The SWR needs to be fairly low however, Most people do not have an antenna that covers the entire
By
W7WRX
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#40349
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Re: LK-450NT
All the LK series NT ( no tune) amps have several small load and tune capacitors. You must pre select the frequencies you want to operate on each band first. ?Then you use the internal load and tune
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Louis Parascondola
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#40348
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LK-450NT
Hi all, Tomorrow I'm going to see a friend that has some kind of problem with his LK-450 NT amp. At this time I have no idea what the problem is due to inconsistent information. But I have a question,
By
Bob
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#40347
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Yeah, Chuck ¨C that must have sucked ! From around 2500W PEP out down to 1500W PEP out. Ouch ! But, as you say, not a big deal to any of us. Sent: Friday, March 22, 2024 6:04 AM To:
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John Sparkes
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#40346
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Good day Chuck and Group., You were well stitched up, it means the FCC and ARRL thought a 4-1000, 100% plate modulated with all the trimmings was equivalent to a TL922 or SB220, amazing !! Our
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michaeljcburns
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#40345
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
That¡¯s great news, Michael. Congrats !
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John Sparkes
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#40344
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Well, there you go¡.250W AM carrier for 100% modulation. An Upgrade for you guys but when they did that with the 1500W PEP for us USA AM guys years ago, it was about a 3 dB hit. Not that anyone
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Chuck Neal
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#40343
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Good day John and Group., The day after I posted, the RADCOM dropped through the door with a synopsis of the new licence variations , 1 Kw pep it is. 73 de Michael G3TCA., ==================
By
michaeljcburns
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#40342
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Understood. Wouldn¡¯t that be wonderful ? A licence-approved 4kW PEP !! Can¡¯t see that ever happening¡¡officially. Luckily, it happens all the time, unofficially. Especially on this reflector !
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John Sparkes
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#40341
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Good day John and Group., We've only heard the figure 1 Kw banded about at the moment, got to wait for the details in writing on our new licences. When I made the post I had my tongue very
By
michaeljcburns
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#40340
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Hi Michael. 150W DC fully modulated = 400W PEP. So, I imagine your new granted level would be 1kW PEP¡.? This is the new power level we were asking for down here in VK. Our existing legal power
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John Sparkes
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#40339
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
Good day Jim and Group. I reckon your suggestion of using a Pi-net on it's own is the best way to go, can always up the Q a bit and see what happens. That line 74 where GM3SEK uses that formula
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michaeljcburns
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#40338
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Re: High Temperature in Toroid of the PI-L network (Alpha 78)
On the gm3sek software, it does a calc, to arrive at image Z...called 'RM'.? ( sq root of? R1 X R2).? R1 = transformed plate load Z? ?R2= 50 ohm output Z). Fact is,,,? u can enter any value u
By
Jim VE7RF
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#40337
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