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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

----- 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
?
-----Original Message-----
From: ham_amplifiers@yahoogroups.com [mailto:ham_amplifiers@yahoogroups.com]On Behalf Of Garry
Sent: Friday, January 05, 2007 7:57 PM
To: Ham Amplifiers
Subject: [ham_amplifiers] Ham Radio Magazine

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


Re: Ham Radio Magazine

David C. Hallam
 

开云体育

Garry,
?
I have that issue on CD.? What article do you want?
?
David
KC2JD
?

-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]On Behalf Of Garry
Sent: Friday, January 05, 2007 7:57 PM
To: Ham Amplifiers
Subject: [ham_amplifiers] Ham Radio Magazine

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


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:
> 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.


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:
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.


Re: 8170 AMP

Phil Clements
 

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


8170 AMP

vaj4378
 

I posted a few pictures of my 8170 amplifier.

-Steve


Re: grid driven tetrode

 

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


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:


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


Re: Enough!

 

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


Re: grid driven tetrode

 

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


Ham Radio Magazine

Garry
 

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


Re: Enough!.... final comment.

FRANCIS CARCIA
 

nice to?hear from?a few people with brains

pentalab wrote:

--- In ham_amplifiers@yahoogroups.com, "David C. Hallam"
> 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.

### 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 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.

### 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.

>
> 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.

#### Why not just put everything to a plebesite/ vote/ on line
vote ? Let the people decide.

Later.... Jim VE7RF

>
> David
>



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:

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!.... final comment.

pentalab
 

--- In ham_amplifiers@..., "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.

### 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 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.
### 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.






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.
#### Why not just put everything to a plebesite/ vote/ on line
vote ? Let the people decide.

Later.... Jim VE7RF





David


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?
I think that's what the majority would like to do. I sincerely doubt
that those who came here to discuss ham radio care about a one man
Hate America campaign. Maybe Cindy Sheehan or Hugo Chavez will take him
in.
Obviously, 'enough!' does not apply to yourself (aka 'the majority').

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
voting to reprimand something. Censorship is what was happening at
the old group.

Play nice.

Z

--- In ham_amplifiers@..., KR4DA <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.

PLAY NICE and TRY to keep it AMP related..
Your all big boys your gonna just have to act like it.


pentalab wrote:

--- In ham_amplifiers@...
<mailto:ham_amplifiers%40yahoogroups.com>, "Mike(W5UC) & Kathy(K5MWH)"
<w5uc@> 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


--
Bob
Vmoa chat list ->
Vmoa tech list home ->


Middleburg Fl (South Jacksonville)
ICQ 13912841
Web Page

Visit the FDXPG at

Ham Radio Calls: KR4DA FG/KR4DA J79DA HK0/KR4DA

Motorcycles CBMMA #4
1977 XS750D 1J7008405
1997 Vmax12J VMOA #504


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