I wonder though Don, while I've got your .. uhm 'ear' (eyes?) The link
could use a little tuning to take a bit more load in the final. I've
modified one of my 80m B&W HDVL plug-in coils and removed two turns on
each side (4 turns, total), to raise the plate current a bit, because the Q
is
- Original Message -
From: "Mike Sawyer" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Thursday, September 22, 2005 5:17 PM
Subject: Re: [AMRadio] Pi-Net vs Link Couple
Doesn't the BC-610 accomplish this with the 250TH? Yes.
Or might it be that it is
utilizing half the
Darrell, WA5VGO wrote:
Triodes are great for grounded grid, but for class C, why fight
neutralization? Use a power grid tube. Sure you need a screen supply,
but consider the paybacks. No neutralization; at least on the lower
frequencies, and low drive requirements. I realize modulating it is a
Don:
If you are talking about a "true" balanced antenna tuner, with link coupling
and dual-differential output caps, and NO Baluns, you are not likely to
achieve 160 through 10.
I built a monster true-balanced tuner a few years ago for 160 through 40M.
With the components required for the lo
Triodes are great for grounded grid, but for class C, why fight
neutralization? Use a power grid tube. Sure you need a screen supply, but
consider the paybacks. No neutralization; at least on the lower
frequencies, and low drive requirements. I realize modulating it is a
little trickier, but I'
Mike:
Where would one find the 232-620?
84 microhenry would be great!
73, Barrie, W7ALW
- Original Message -
From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Wednesday, September 21, 2005 8:48 PM
Subject: [AMRadio] Johnson 232-620
Edgewise wound,
Hi all,
I have a different twist on this wonderful topic. Years ago I was going
over the very issue, and I had a Viking I transmitter, and I wanted to run
the legal limit of about 375 watts carrier 100% modulated am. So that would
be 6 db to go from say 100 watts to 400 watts. I went through
Byron Lichtenwalner wrote:
Geoff
Don't have the tube characteristics here, but from your description
your changing the operating point of the amp by changing L/C ration.
Or the "transformer effect" (turns ratio of link to plate coil) gives
a better match to the antenna)
http://w5omr.sha
Mike Sawyer wrote:
Doesn't the BC-610 accomplish this with the 250TH? Or might it be that it is
utilizing half the coil.
Mike(y)
W3SLK
Yeah, it does, Mike.
I didn't even think about that, and I recently downloaded a schematic in
.gif format of a BC-610 E model.
Not the best in the world,
Byron Lichtenwalner wrote:
Geoff
Don't have the tube characteristics here, but from your description
your changing the operating point of the amp by changing L/C ration.
Or the "transformer effect" (turns ratio of link to plate coil) gives
a better match to the antenna)
If you have a 100
Doesn't the BC-610 accomplish this with the 250TH? Or might it be that it is
utilizing half the coil.
Mike(y)
W3SLK
- Original Message -
From: "Brett gazdzinski" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio'"
Sent: Thursday, September 22, 2005 8:13 AM
Subject: RE: [AMRadio] Pi-Net vs
Geoff
Don't have the tube characteristics here, but from your description your
changing the operating point of the amp by changing L/C ration. Or the
"transformer effect" (turns ratio of link to plate coil) gives a better
match to the antenna)
If you have a 1000 pf that will take the volta
Byron Lichtenwalner wrote:
Geoff
Your last discussion on the L/C ratio of the tank intrigues me. Was the
circuit not resonate with the extra (now removed) turns?
On the link tuning, what series cap. value are you using? Does it load
heavier when at max. cap or minimum?
Byron, W3WKR
It w
Geoff
Your last discussion on the L/C ratio of the tank intrigues me. Was the
circuit not resonate with the extra (now removed) turns?
On the link tuning, what series cap. value are you using? Does it load
heavier when at max. cap or minimum?
Byron, W3WKR
- Original Message -
From: "W
I need to better proof-read my posts, before hitting the 'send' button..
W5OMR/Geoff wrote:
<>Donald Chester wrote:
What does 1500 watt pep have to do with it?
Well... you know. I certainly don't want to Advertise ;-)
My Gates BC1-T uses a pair of 833A triodes in parallel, with a
pi-netw
Donald Chester wrote:
What does 1500 watt pep have to do with it?
Well... you know. I certainly don't want to Advertise ;-)
My Gates BC1-T uses a pair of 833A triodes in parallel, with a
pi-network followed by a T network and another L netork, to couple the
final to the antenna. The gr
I am looking for the 6.0khz filter..Pt # F-455-J60.. for the Collins 75A4
Reciever...Tnx Ron W6MAU
Lots of luck. The trophy collectors have driven the price beyond what one
used to pay for an entire 75A4. You can buy a reproduction filter, built
around a modern Rockwell mechanical filt
I know of a guy who wants to build a rig using a single 450TL in the final,
modulated by a pair. He >wants to pi-net the output, but I've heard that's
a bad idea.
I want to build a rig using a medium powered tride, perhaps a 250TH,
modulated by a pair of >811's. Pi-Net, or Link Couple?
In a message dated 9/22/05 9:19:29 AM, [EMAIL PROTECTED] writes:
> I want to construct a balanced line antenna tuner to cover 160-10 meters,
> does any one have any good ideas on one, and where a diagram can be
> obtained.
>
>
A multitude of circuits and thousands of pages of description, the
Johnson 226-3 Inductance 13.5 microHenry, 19.5 turns. Heavy duty rotary
inductor for amateur and commercial use. Handle over a KW of modulated RF
energy to 30 mHz. Winding 1/4" x 1/8" edgewise copper. Spring loaded
beryllium copper contact. Variable pitch winding- wide frequency coverage.
Heig
Hey Ronnie, YOU got the Boa Constrictor, OM!
Why would you need it? Oh I get it - you want it for the DRIVER
STAGE!
He he he he he!
On 22 Sep 2005 at 11:16, ronnie.hull wrote:
> he don't need it Bry, let me have it LOL
>
>
>
> -- Original Message ---
> From: Geoff <[EMAIL PRO
On 22 Sep 2005 at 9:03, Geoff wrote:
> Bry, just on the Off-chance that I might make it to Florida, what are
> you asking for that 2500v @ 1amp xfmr?
> -Geoff/W5OMR
Hi Geoff - I would let it go real reasonable - like $26.00
It's an older style upright transformer with a ceramic top.
Kind of c
I want to construct a balanced line antenna tuner to cover 160-10 meters,
does any one have any good ideas on one, and where a diagram can be
obtained.
Thanks,
Don W5FFK
On Thu, 22 Sep 2005 10:12:24 -0400 (EDT) [EMAIL PROTECTED]
writes:
> Send AMRadio mailing list submissions to
> amradio@
he don't need it Bry, let me have it LOL
-- Original Message ---
From: Geoff <[EMAIL PROTECTED]>
To: Discussion of AM Radio
Sent: Thu, 22 Sep 2005 09:03:49 -0500
Subject: Re: [AMRadio] Pi-Net vs Link Couple
> ronnie.hull wrote:
>
> > <>well Bry, you gotta unnerstand, I'm next
Ronnie, Hello! The 1 kilowatt Triode Pi-Network Amplifier using the 450TH is
in the Editors and Engineers Handbook 14th Edition. The first of the
handbooks edited by Bill Orr W6SAI. It has the RED cover. It starts on Page
585 in chapter 26-12 and ends on page 589. My scanner got knocked off the
tab
ronnie.hull wrote:
<>well Bry, you gotta unnerstand, I'm next door to Texas, that makes me a
cousin.. and you know how they are in texas.. everything is bigger!!!
R
Bry, just on the Off-chance that I might make it to Florida, what are
you asking for that 2500v @ 1amp xfmr?
--
73 = Best Re
ronnie.hull wrote:
<>well it clearley shows on the top of the tranny 4100 - 0 - 4100..
I'll test
it out this weekend and we'll know then.
did you ever even put power to this transformer?
R
Yes, I did. Did it at John/WA5BXO's place.
well Bry, you gotta unnerstand, I'm next door to Texas, that makes me a
cousin.. and you know how they are in texas.. everything is bigger!!!
R
-- Original Message ---
From: [EMAIL PROTECTED]
To: Discussion of AM Radio
Sent: Thu, 22 Sep 2005 08:41:26 -0400
Subject: Re: [AMRadi
well it clearley shows on the top of the tranny 4100 - 0 - 4100.. I'll test
it out this weekend and we'll know then.
did you ever even put power to this transformer?
R
-- Original Message ---
From: Geoff <[EMAIL PROTECTED]>
To: Discussion of AM Radio
Sent: Thu, 22 Sep 2005 07
On 22 Sep 2005 at 7:22, Geoff wrote:
> > I just got the worled biggest honker daddy plate transformer from W5OMR.
> > 8200V center tapped ( 4100 - 0 - 4100 ) at 4.5KVA !!
> I think you're going to find, and we talked about this, that the
> transformer is 4100v across the entire secondary (@4.74
ronnie.hull wrote:
<>Mike I'm the fellow that is going to build up a Class C final using
a 450TL.
I would love to get a copy of that schematic for the 450TH rig in the
Editors
and Engineers handbook. I have a few of those, but apparently, not
that one.
I have a very nice B&W 850A or 852 that
I don't think there is any way to run a triode single ended with link
coupled
output, not in class C.
I run a pair of 812A's (or 811A's, or V70D's) push pull link coupled output
modulated by a pair of 811A's.
It works very well.
You can run them up to 2000 volts on the plates, or 1750, 0r 1500.
Mike I'm the fellow that is going to build up a Class C final using a 450TL.
I would love to get a copy of that schematic for the 450TH rig in the Editors
and Engineers handbook. I have a few of those, but apparently, not that one.
I have a very nice B&W 850A or 852 that I can use in this rig.
On 21 Sep 2005 at 21:45, Geoff wrote:
> I've heard recently that matching the output of the Class C
> pate-modulated final to the antenna is better, and more efficiently
> achieved by link coupling, vs Pi-Net.
Where did you hear that?
> On the other hand, it's argued
> that Pi-Net coupling
I am looking for the 6.0khz filter..Pt # F-455-J60.. for the Collins 75A4
Reciever...Tnx Ron W6MAU
35 matches
Mail list logo
