>It is also easy for the modulator
to over modulate because it doesn't need to deliver as much current.
John, WA5BXO
This is probably the main cause of trouble using an amp with a driver as
described. I constantly hear crappy audio on the bands with the
configuration. Many do not underst
im Wilhite
Sent: Tuesday, February 12, 2008 8:16 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Ranger driving SB220
I see this discussion every so often and wonder something. If you lower
the plate voltage or current the final (s) draw, what is happening to
the imp
I see this discussion every so often and wonder something. If you lower
the plate voltage or current the final (s) draw, what is happening to
the impedance the modulation transformer sees?
The design of a class C final looks at the plate load impedance of the
final. If you alter that, the mo
D] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, February 11, 2008 7:48 PM
To: amradio@mailman.qth.net
Subject: RE: [AMRadio] Ranger driving SB220
Ron,
Yes, the VKII uses a pair of 6146s and it has a 6AQ5 adjustable screen
clamp tube.
I see no reason to wast power with an attenuator and there is a
Ron,
Yes, the VKII uses a pair of 6146s and it has a 6AQ5 adjustable screen
clamp tube.
I see no reason to wast power with an attenuator and there is a sweet
spot in the final current thru the mod iron that requires a less than
full rated final current to avoid saturation.
It seems to me that
Patrick Thompson wrote:
How did you go about getting the RF drive from the Ranger down to a level
usable by the SB220?
[...]
I thought about a homemade pad but that's a lot of heat to throw away. Maybe
a 3db pad and turn the drive down a little?
AE5AW/Bill, in San Angelo, TX, inserted a
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, February 11, 2008 7:22 PM
To: amradio@mailman.qth.net
Subject: RE: [AMRadio] Ranger driving SB220
Hello,
Would this one knob screen control technique also be a workable option
for a VKII, etc, after proper loading/setup in
l.
Thanks!
Pat
wa4tuk
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Gary Blau
Sent: Monday, February 11, 2008 9:39 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Ranger driving SB220
It's a good place to start.
Here&#
Hello,
Would this one knob screen control technique also be a workable option
for a VKII, etc, after proper loading/setup into a dummy load?
Bill, KB3DKS
-Original Message-
From: W6OM
Pat
Leave the mic gain alone, just crank down the screen voltage via a pot
inside. I can crank min
It's a good place to start.
Here's some more info:
http://www.w3am.com/ranger.html
You don't have to do anything other than the screen mod if you don't
want to.
This is just one option for you.
g
Patrick Thompson wrote:
Thanks to all who replied.
If I go the route of lowering screen voltage
www.qsl.net/w6om
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Patrick Thompson
Sent: Monday, February 11, 2008 6:20 PM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: RE: [AMRadio] Ranger driving SB220
Thanks to all who replied.
I
]
[mailto:[EMAIL PROTECTED] On Behalf Of Gary Blau
Sent: Monday, February 11, 2008 7:45 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Ranger driving SB220
You can lower the power in a couple different ways.
Lower the screen, run the PA on the low HV, attenuate the RF, etc
of AM Radio in the Amateur Service'
Subject: [AMRadio] Ranger driving SB220
How did you go about getting the RF drive from the Ranger down to a level
usable by the SB220? I'm thinking about something similar to get to the
200-250 watt carrier level (or 800 to 1000 pep AM). I'm guess
There was a great article in Electric Radio (Issue 139, Dec 2000, page
25) on modifying the Ranger screen voltage with a variable control, and
even access from the front panel, without drilling any holes in the front
panel.
Works great.
Pete, wa2cwa
On Mon, 11 Feb 2008 19:44:53 -0500 Gary Blau <
You can lower the power in a couple different ways.
Lower the screen, run the PA on the low HV, attenuate the RF, etc.
If you're driving an amp there's no advantage to running full power in
the Ranger. In fact, you give up a lot of potential positive peak
modulation capability, if that's impor
How did you go about getting the RF drive from the Ranger down to a level
usable by the SB220? I'm thinking about something similar to get to the
200-250 watt carrier level (or 800 to 1000 pep AM). I'm guessing the amp
won't need much more than 10-15 watts drive (40 to 60 watts pep AM) leaving
a li
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