I would like to use a cheap am with my DX-60.
An SB-200-230 seems to be a Class B amp. There for it only conducts on
the positive going cycle. I don't mean to sound silly, but someone told
me I could run this in SSB Mode using AM input from my DX-60, I run 100
Watts carrier for 400 Watts
Alan, most all tube type linear amps are class B, or AB and can
be single ended or push-pull. In RF service the tank tuning takes care
of the output wave distortion making nice pretty sine waves. Linear
amps are not class C because class C is really more like a switch than
an amplifier.
Magnetic hysteresis is a complicating factor.
When you apply a magnetic field to a magnetic
material, it is partially magnetized. When you
saturate it, it is strongly magnetized. When it
is magnetized, it opposes the application of a
reverse magnetic field, and it takes a certain
reverse applied
I love this stuff!
John, WA5BXO
-Original Message-Not in its entirety.
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Bruhns
Sent: Thursday, March 16, 2006 10:12 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Class AB and B audio XFMRS
Magnetic hysteresis is
Folks,
May I share my opinion on controversial pricing?
Whether or not an asking price is sincere, it can
stand or fall on its own merit. If it feels ridiculous
to you, others will probably feel the same way. Just
get a good laugh and let it go, and try to resist the
urge to utter catcalls and
From: Alan Beck [EMAIL PROTECTED]
I would like to use a cheap am with my DX-60.
An SB-200-230 seems to be a Class B amp. There for it only conducts on the
positive going cycle. I don't mean to sound silly, but someone told me I
could run this in SSB Mode using AM input from my DX-60, I
Short answer. The SB200 uses a pair of 572B/T160L rated at 160 watts each.
AM Linear output can not be more than one half of total dissipation. The
power supplies are usually rated for continous service (AM) at 25 percent of
the peak. For SB220 a 400 watt transformer is used for 2000 watts pep
How about a Johnson thunder bolt is 300 watt carrier ok ? I hope so
cause that is what I have been doing
The transformer in there is twice as big as my swan mark 1.
thanks ..de/dale/ka5who
YUP. The two things are the tubes and the power supply.. One half
dissipation is MAX.. you are using 800 watt tubes so 400Watt carrier is max.
The Thunderbolt has a real power supply, so, sure 300 watts is fine.Since
SSB is 25 to 30 percent average of peaks the manufactures can squeeze in
small
If I understand these responses this all boils down to answer Alan's
original question and that is that a SB-200 would be ok with the DX-60 at
the DX-60's max output . Correct?
Tom K3TVC
- Original Message -
From: Mike Dorworth, K4XM [EMAIL PROTECTED]
To: Discussion of AM Radio
Don,
You said: So you could run maximum 1500 watts DC input to those tubes,
with 500 watts
carrier output, and 1000 watts dissipated by the tubes.
Reply from Jim WD5JKO:
What is stated above is correct if the tubes can dissipate 1000 watts of
heat (like two 3-500Z's flat out blushing),
Yes, those numbers are possible in amateur service.
When I ran a pair of 3-400s linear, I ran about 800
watts carrier input, I got about 160 watts carrier
output, disspipation about 640 watts, 200 % mod, and
about 1500 PEP out. (Efficiency gets bad when you set
them up that way.)
If I turned the
Jim,
I guess my question is really: Can anyone actually demonstrate a real AM
linear that can output 500 watts carrier and show 2000 watts PEP into a
dummy load with a nice looking audio sine wave on the scope, from the RF
pickup, while running 1500 watts DC input ? If so, please send me an
The SB-200 uses two 572B's. The SB-220 is the amp that uses two 3-500Z's.
Joe W4AAB
- Original Message -
From: Donald Chester [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Thursday, March 16, 2006 3:48 PM
Subject: RE: [AMRadio] Amplifier to use with my
Thanks so much for taking the time to remind me about all this stuff!!!
When I was 25 I worked on a Gates 50B that was as old as I was. I mostly just
monitored voltages and looked for trouble.
I was facsinated back then as I find myself being now while I foray into the
world of AM again.
I
From: kenw2dtc [EMAIL PROTECTED]
Don says:
So you could run maximum 1500 watts DC input to those tubes, with 500
watts carrier output, and 1000 watts dissipated by the tubes
***I need a little help with the math here Don. You are suggesting
that with a class B linear in AM mode,
I still say, forget the linear, and use less money to build a plate
modulator for the DX60. It will work better, sound better, cost less, and
heat the shack up less. As I recall the DX 60 has a 6146 in the final for
class C CW and puts out about 40-50 watts of carrier if it were plate
I've posed a couple of questions on some other lists and received some
good advice, but I am still in need of more. My BC-610-E has a bad
feedback or talk back problem. I've placed a capacitor across the
overload relay (RY-5) and that did eliminate a little of the talk back.
However, with
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