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Author Topic: Why can't you buy an hf amp in the USA running more than the legal limit?  (Read 25460 times)
G3RZP
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Posts: 1321




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« Reply #60 on: November 22, 2015, 02:27:52 PM »

Quote
And the extra power helps when antennas are not pointed properly, a whole new azimuth window opens up.

Even if they are, when it's a marginal path, maybe just opening or closing - especially on CW, maybe through the auroral zone - QRO and a gain antenna can make all the difference between QSO and no QSO
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KM1H
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Posts: 5546




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« Reply #61 on: November 22, 2015, 05:02:23 PM »

That is correct Peter and even finding a skew path under disturbed conditions when you are pointed in the normal azimuth heading.

Ive worked EU and N Africa peaking as far down as S America on 10-15M and also 6 during F2 years.

There is no single answer to ham radio since everyone has their own goals/expectations and contact interests. I like DX from a 59NH contest report to several hours of great conversation; I speak a few other languages and my GF contributes with others. With US contacts, talking about vintage vehicles, rods and customs, etc can keep me going for hours and power helps maintain the frequency...the meek will attain nothing in this game!

Carl
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G3RZP
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Posts: 1321




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« Reply #62 on: November 22, 2015, 11:49:25 PM »

Wasn't it Heinlein who wrote that the meek shall inherit the earth - a plot about six feet by two?
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W8JX
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Posts: 13268




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« Reply #63 on: November 23, 2015, 04:00:47 AM »


The 3CX3000A7 is the best bargain on the planet at a bit under $700 from China (same price as a 8877 from the same source) using Eimac supplied tooling, has a 225W grid structure, and can be rebuilt. At 1500W it will outlast the user.


They do not buy/use them to only run just 1500 watts though.
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Ham since 1969....  Old School 20wpm REAL Extra Class..
N9AOP
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Posts: 1174




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« Reply #64 on: November 23, 2015, 08:02:15 AM »

Poor IMD is a contesters dream.  Working your way through all that splatter hones your skills.
Art
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W8JX
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Posts: 13268




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« Reply #65 on: November 23, 2015, 10:04:20 AM »

Poor IMD is a contesters dream.  Working your way through all that splatter hones your skills.
Art

Or your splatter from a illegal power over driven amp makes other callers unreadable.... I cannot remember last time FCC actually sited someone for illegal power or even splatter.
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Ham since 1969....  Old School 20wpm REAL Extra Class..
KM1H
Member

Posts: 5546




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« Reply #66 on: November 23, 2015, 11:09:24 AM »

Quote
They do not buy/use them to only run just 1500 watts though.

Not everyone thinks like you.....thankfully There are far, far more 2000-3000W capable commercial amps running full bore.

Quote
Or your splatter from a illegal power over driven amp makes other callers unreadable.... I cannot remember last time FCC actually sited someone for illegal power or even splatter.

I hear far more poor signals from barefoot rigs and AL-80A/B, SB-1000, 30L1, AL-811 family, Russian tube amps (commercial and homebrew), and similar users.
The serious QRO ops are not that many and the clean ones you never notice.

The FCC has been adrift since Riley retired.

Carl
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W8JX
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Posts: 13268




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« Reply #67 on: November 23, 2015, 11:30:52 AM »


Not everyone thinks like you.....thankfully There are far, far more 2000-3000W capable commercial amps running full bore.


Thankfully they are running illegal power?  Ham radio is becoming more like high dollar CB...
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Ham since 1969....  Old School 20wpm REAL Extra Class..
VR2AX
Member

Posts: 1016




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« Reply #68 on: November 24, 2015, 09:49:03 PM »

This is why the 3CX3000A7/F7 is popular with many in the 5-7 KW range, .

The 3CX3000A7 is the best bargain on the planet at a bit under $700 from China (same price as a 8877 from the same source) using Eimac supplied tooling, has a 225W grid structure, and can be rebuilt. At 1500W it will outlast the user.



And the extra power helps when antennas are not pointed properly, a whole new azimuth window opens up.

Carl

The KL-1 runs the anode voltage around 6KV off load, 5-5.5KV on load, 1.5A Ia and 0.3A Ig. This is to accommodate 200 watt exciters. The data sheet specifies a maximum voltage of 5KV. Is that likely to reduce the life of the tube? (assuming no more than ~ 200 watts drive?
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KM1H
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Posts: 5546




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« Reply #69 on: November 25, 2015, 01:53:42 PM »

That tube is still loafing at that level. The tube actually has a 4000W PD rating and they are popular in 5000W output TX for the AM and FM BCB
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VR2AX
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Posts: 1016




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« Reply #70 on: November 27, 2015, 12:19:56 AM »

Thanks for the comments.
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