A pair of tetrodes or pentodes, grid driven in AB1 need little drive,
so the 12 watts from a K2 may be sufficient for driving something like
a 4CX800. You may need switched tuned inputs instead of passive grid to
drive it with 12W. I think most amplifiers on the market are class AB2
PROTECTED],
Elecraft elecraft@mailman.qth.net
Subject: Re: [Elecraft] HF amp kits
John -
As explained on the Linear Amp UK web site -- the Ranger 811K (kit) is NOT
for beginners.
This kit is not recommended for the absolute beginner as a reasonable
knowledge of electrics
Hi Chris,
With barefoot K2 you don't need two stages to get 600-800 watts out. For
instance 4CX800 is happy grid driven with 10 watts. Unfortunately most HB PA
articles now are in Russian. However I could help with the translation, if
needed. Having only smaller tubes in my junk box, I am working
Chris,
Multiple stages are not required.
Any class AB1 amplifier requires no power to the grid to develop full
output. However, the proper voltage swing at the grid is required. If
you use a tetrode, a link coupled parallel tuned circuit in the grid
will usually provide the required
I have a pair of 4cx250b/4x150a tubes as modulators
for my 813 AM transmitter.
Great tubes, you can go from 1000 volts on the plate to 2000
volts in AB1 without bias or screen voltage changes.
900 watts of audio out, the same for CW I suppose.
That's at 2000 volts 500ma.
They take zero driving
Chris Kantarjiev wrote:
[warning thread drift]
The Linear Amp kits seem to need a fair amount of drive. I've been
idly thinking about a linear that would allow me to drive it with
my barefoot K2 and get 600-800 watts out for CW.
Didn't there used to be a Part 97 gain limit of 10dB for RF
On Apr 5, 2007, at 9:17 AM, Fred Jensen wrote:
Chris Kantarjiev wrote:
[warning thread drift]
The Linear Amp kits seem to need a fair amount of drive. I've been
idly thinking about a linear that would allow me to drive it with
my barefoot K2 and get 600-800 watts out for CW.
Didn't there
The 15 db rule applies only to manufactured for sale amplifiers. It
does not apply to amplifiers that an individual ham builds for him or
herself, particularly when a a kit is not involved.. Section 97.317 of
the rules, which is where the 15 db rule appears, applies to the
certification of
Just working from memory here, but wasn't there also a limit that the
amateur could only build one such amp a year?
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
Jim Wiley wrote:
The 15 db rule applies only to manufactured for sale amplifiers. It
does not apply to amplifiers that an
I have been a ham for 43 plus years (12/23/63) and up to now have not
heard of any such limitation.
Jozef WB2MIC
David Wilburn wrote:
Just working from memory here, but wasn't there also a limit that the
amateur could only build one such amp a year?
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2
There used to be this rule:
97.315 (a):
No more than 1 unit of 1 model of an external RF power amplifier capable of
operation below 144 MHz may be constructed or modified during any calendar
year by an amateur operator for use at a station without a grant of
certification. No amplifier
it easily and quite well.
73,
Sandy W5TVW
Google HF packer for website and details.
- Original Message -
From: David Wilburn [EMAIL PROTECTED]
To: Elecraft Reflector elecraft@mailman.qth.net
Sent: Thursday, April 05, 2007 4:57 PM
Subject: Re: [Elecraft] HF amp kits
Just working from
From the general class question pool.
G1F02 (B) [97.315a]
Without a grant of FCC certification, how many external RF
amplifiers of a given design capable of operation below 144
MHz may you build or modify in one calendar year?
A. None
B. 1
C. 5
D. 10
Here is the ARRL link to the
Should have read to the end of the posts. Thanks for the update. I
just remembered it from testing.
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
David Wilburn wrote:
From the general class question pool.
G1F02 (B) [97.315a]
Without a grant of FCC certification, how many external RF
1:50 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] HF amp kits
Not to offend the QRP purists in the group, but I think an modest amplifier
kit would be spectacularif you could keep the kit down below a a grand.
I looked at the one from the UK and I felt that it was pretty easy to
build
.
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jozef
Hand-Boniakowski
Sent: Thursday, April 05, 2007 3:23 PM
To: David Wilburn
Cc: Elecraft Reflector
Subject: Re: [Elecraft] HF amp kits
I have been a ham for 43 plus years (12/23/63) and up
with a list of parts and
accompanying photographs.
Greg
w9gb
- Original Message -
From: John Harper
To: Elecraft
Sent: Tuesday, April 03, 2007 5:04 PM
Subject: [Elecraft] HF amp kits
Anyone here have any first-hand experience with either of these two HF amp
kits? It might be fun to build
Anyone here have any first-hand experience with either of these two HF amp
kits? It might be fun to build something with tubes - I mean valves:
http://www.linamp.co.uk/
John Harper AE5X
http://www.ae5x.com
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