On Jan 6, 2007, at 1:05 PM, badgerscreek wrote: Extremely high power makes for an interesting experiment thats all. I
have not used my big box on real antennas for many many years.
However i still fire it up into a dummy load, and i still try and
improve its circuits. Does that make sense probably not
Anything above 1 kilowatt is very hard to justify on the needs of a
communications circuit. I would argue that its only the lower bands
where it may be of some help. Even then its hardly needed and is only
helpful in the case of jammers etc. Its shame having a high
electricity bill because someone else has a poor receiving location!
Very few stations these days have the ability to radiate the power
at the low incoming angles where it can do some good. On 80m and 160m, low radiation angles are typically not good. ...
If i had the choice between high power and a hilltop location with
sloping terrain in all directions i would take the hilltop location
over the 20db amplifier any day. Better still is a saltwater island
with verticals, i then could run these stations on solar power and
achieve the same thing without contributing to global warming! You would still be exhaling CO^2, cheerz, Greg. R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
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You might have noticed I stayed out of the political discussion of
running power. Lets move on to the topic of the Religious Implications
of Running Power.
Steve, nice construction job.
Sincerely,
BOB DD
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Thanks Rick, Well I think the 4CX5000 will do 11 KW max so that puts your numbers 8/11 max or about 75% of max to stay clean. I suppose a good high plate supply with enough screen voltage to provide enough gain. I'm actually playing with an old Viking 2 CDC modulator that uses 807s. Crazy flash back to youth. Rig is so I can get on AM from summer home. Small lot near the beach not really suited for QRO.....at least during waking hours. gfz
R L Measures wrote:
On Jan 5, 2007,
at 6:22 PM, FRANCIS CARCIA wrote: > > So Rick, > Do I assume you never want to drive the grid 1 positive 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? gfz Plywood 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
|
very nice job! How about a schematic
Steve Cook wrote:
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Show quoted text
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 com> wrote: Nice job Steve. How successful were you in resonating the grid on 10 through 15 meters? Do you bypass the grid Roller inductor on 10 through to 15 meters? The stray L with the interconnecting wires caused me all sorts of trouble even though the Grid lead length was close to zero. I also had to use a 1000 ohm grid R with a 20:1 transformer to develop full grid drive voltage. Well i only had a 100 watts of clean low IMD power. I am still unhappy with the grid circuit. My suggestion to anyone contemplating building a 8170 amplifier is too sort the grid circuit out first. That and the sheer weight is the only problems you will have. Some kind of filament regulator that can switch during RX:TX would also be advisable especially if
you running it off single phase. Greg --- In ham_amplifiers@yahoogroups.com, "vaj4378" > wrote: > > I posted a few pictures of my 8170 amplifier. > > -Steve >
Cheap Talk? Yahoo! Messenger's low PC-to-Phone call rates.
|
Steve et al,
Without taking a stand on either side of the argument I will say this...
Bob, KR4DA, started this group to give us a place to have amplifier discussions without senseless censorship due to personal or professional differences. My personal opinion is that we should respect his intentions by staying within the fuzzy bounds of ham amplifiers and not use this as a place to vent our views on other, unrelated, topics.
All of us have an opinion and, thankfully, we do have the right to express them, but I carefully pick and choose whose living room to do it in.
Best regards for a Happy New Year!
Tony W4ZT
Steven Grant wrote:
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Show quoted text
At 09:53 AM 1/5/2007, you wrote:
There are no moderators on here, if you have an issue with it, i suggest you not open this thread
|
Hsu,
?
Sorry
but I don't.? My Ham Radio on CD only goes up to 1976.? I have been
meaning to buy the second CD from ARRL with the rest of the issues but just have
never done it.
?
73
David
toggle quoted message
Show quoted text
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
----- Original Message -----
Sent: Saturday, January 06, 2007 8:46 PM
Subject: RE: [ham_amplifiers] Ham Radio Magazine
Garry,
?
I
have that issue on CD.? What article do you want?
?
David
KC2JD
?
Does anyone have a March 1975 issue of Ham Radio magazine where you
could scan an article and forward to me?
Thanks &
73,
Garry - WR4R
|
At 09:53 AM 1/5/2007, you wrote:
There are no moderators on here, if you have an issue with it, i suggest
you not open this thread
toggle quoted message
Show quoted text
WHAT PART OF ENOUGH! DON'T
YOU UNDERSTAND?
At 08:18 AM 1/5/2007, you wrote:
So you think the set up we have
today is good?
"David C. Hallam" <dhallam@...>
wrote:
- Jim,
- ?
- Socialism doesn't work, has not ever
worked, and will never work for the every reasons you have pointed out in
your previous emails.? Anytime you get the government involved in
anything, corruption causes things to go to hell.? Government is the
biggest source of corruption in society.? It surpasses individuals,
businesses, and anything else you can name.? God save us from more
big government.? I'll take big business corruption any day compare
to big government corruption.? We elect people who think they know
what is right for you.? They end up knowing what is right for
them.
- ?
- The US had a famous cowboy philosopher
back in the 1920's by the name of Will Rogers.? He was a Democrat
and probably some what of a socialist, but one of his most famous quotes
was " The people elected Calvin Coolidge president.? He didn't
do much, but that's what the people wanted."? I think that's
what the people in the US want today.? A president and congress that
won't do much. Stop trying to fix things and just leave us
along!!!!!
- ?
- David
- ?
- -----Original Message-----
- From: ham_amplifiers@... [
mailto:ham_amplifiers@...]On Behalf Of pentalab
- Sent: Thursday, January 04, 2007 4:19 PM
- To: ham_amplifiers@...
- Subject: [ham_amplifiers] Re: Enough!
- --- In
ham_amplifiers@..., "Mike(W5UC) &
Kathy(K5MWH)"
- wrote:
- >
- > Francis, several days ago I attempted to end this discussion by
- > saying that we will not agree on this. We will not! Who is the
- > moderator here and why isn't he doing his job? It is time to end
- > this rant designed to promote socialism.
- ### What's wrong with Socialism ?? Works here. What needs to
- be gov't run is stuff like medical/dental/ residential
- water/commercial AC power production/ car insurance/ Ferry sytems,
- etc. At least that's our idea of.."socilism" You privatize
any
- of that just mentioned... and prices skyrocket.. and standards drop.
- ## case in point.... in VE6 land... they had this brilliant idea
- they would privatize.. and sell off ALL AC power production. The
- idea was that private co's would invest Billions in new power
- production. They were gonna chop it up into 8-10 pieces. When
- only 4-5 co's showed up... they were surprised... and proceeded
- to divvy up the province of alberta into North south east west.
- The co's are real happy now. NONE of em compete with each
- other... since they have their own turf. None of em are the
- slighest bit interested in spending Billions to generate new AC
- power. [the provincial gov't there thought with some co spending
- billions on new power... rates would...drop]. Instead... there
- was no increase in production at all.... rates went up as much as
- 450 % !!
- ### In the UK... they did the same thing with their various water
- supply's for residential water. Their water rates have gone up
- 400 % ! They also privatized the construction of new hospital
- facilities.... now the consumer is paying through the nose for it.
- ### cheap electric/water rates means a better economy. You start
- paying sky high rates... and the one of 2 things happen.... either
- increased production costs get passed onto the consumer... or co XXX
- sells up... and moves. In VE6 land... they had foundries that had
- been there a long time... and couldn't compete with the province of
- manitoba [VE4 land].... due to the huge difference in electrical
- rates. The foundries in VE6 land moved to VE4 land.
- ## If u wanna pay retail + 100%... go for it. Most of us like the
- wholesale rate.
- later... Jim VE7RF
- >
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.16.5/616 - Release Date: 1/4/2007
1:34 PM
"age & treachery will overcome youth & skill"
|
Hi,
I have seen a diagram in Modern Electronic Circuits Reference Manual (John Markus),origional article in 73 Magzine, Holidy Issue 1976, P22-23.Author:B.Baird,"Build This Inexpensive 400 Watt Amplifier".It is a GG Push-pull Amplifier useing a pair 7094, without input matched network,I'm very interested its plate network, it without slug coils and can work in all ahm band and need not change the coil.I'm sad I have not full article. Could some someone can saan or take some photos and send the article to me ?It is a very interesting design, Although it without input Pi network, but I think it still have a better matching than Single End amplifier. Is that right?
73! Hsu
|
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
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Saturday, January 06, 2007 8:46
PM
Subject: RE: [ham_amplifiers] Ham Radio
Magazine
Garry,
?
I
have that issue on CD.? What article do you want?
?
David
KC2JD
?
Does anyone have a March 1975 issue of Ham Radio magazine where you
could scan an article and forward to me?
Thanks &
73,
Garry - WR4R
|
Garry,
?
I have
that issue on CD.? What article do you want?
?
David
KC2JD
?
toggle quoted message
Show quoted text
Does anyone have a March 1975 issue of Ham Radio magazine where you
could scan an article and forward to me?
Thanks & 73,
Garry
- WR4R
|
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: > I posted a few pictures of my 8170 amplifier.
>
> -Steve
Steve, I am impressed! What a fine piece of workmanship. Please add a
pix of the schematic. I assume it is a 20m through 10m tank
circuit?
(((73)))
Phil Clements, K5PC
Any questions? Get answers on any topic at . Try it now.
|
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: Nice job Steve. How successful were you in
resonating the grid on 10 through 15 meters? Do you bypass the grid Roller inductor on 10 through to 15 meters? The stray L with the interconnecting wires caused me all sorts of trouble even though the Grid lead length was close to zero. I also had to use a 1000 ohm grid R with a 20:1 transformer to develop full grid drive voltage. Well i only had a 100 watts of clean low IMD power. I am still unhappy with the grid circuit. My suggestion to anyone contemplating building a 8170 amplifier is too sort the grid circuit out first. That and the sheer weight is the only problems you will have. Some kind of filament regulator that can switch during RX:TX would also be advisable especially if you running it off single phase. Greg --- In ham_amplifiers@yahoogroups.com, "vaj4378" > wrote: > > I posted a few pictures of my 8170
amplifier. > > -Steve >
Cheap Talk? Yahoo! Messenger's low PC-to-Phone call rates.
|
I posted a few pictures of my 8170 amplifier.
-Steve Steve, I am impressed! What a fine piece of workmanship. Please add a pix of the schematic. I assume it is a 20m through 10m tank circuit? (((73))) Phil Clements, K5PC
|
I posted a few pictures of my 8170 amplifier.
-Steve
|
On Jan 5, 2007, at 6:22 PM, FRANCIS CARCIA wrote:
So Rick,
Do I assume you never want to drive the grid 1 positive
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? gfz Plywood 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
|
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:
On Jan 5, 2007, at 9:21 AM, FRANCIS CARCIA wrote: > > 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 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: TL-922A Owner Question
On Jan 5, 2007, at 8:22 AM, Steve Cook wrote:
Benefit?
Speed control or other?
Temp-proportional speed control, cost.
-S
R L Measures <r@...> wrote:
Steve == If the fan on my 922 was kaput, I would replace it with a
12vdc brushless fan of the same diameter and power it from the 11vac
filament winding through a FWB rectifier/C-filter.
-ebd
On Jan 4, 2007, at 3:04 PM, Steve Cook wrote:
Anyone owning a Kenwood TL-922 amplifier -- I would like to know
the part number of the fan mounted on the back of the amp.
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
...
R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
|
On Jan 5, 2007, at 7:06 AM, KR4DA wrote: There is NO MODARATOR.
I created this group on Yahoo.
That's all your going to get out of me.
As it says PLAY NICE.
If there are jerks here so be it. NO CENSURE of
any kind.
So who wants to be the GOD of this group and control
and censure and moderate????? NOT ME. Topband and AMPS have a Fuehrer-censor.
PLAY NICE and TRY to keep it AMP related..
Your all big boys your gonna just have to act like it.
...
R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
|
On Jan 5, 2007, at 9:21 AM, FRANCIS CARCIA wrote:
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
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
|
Does anyone have a March 1975 issue of Ham Radio magazine where you could scan an article and forward to me?
Thanks & 73,
Garry - WR4R
|
