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[AMPS] RE: RF Amplifier Discussion Digest V4 #167

To: <amps@contesting.com>
Subject: [AMPS] RE: RF Amplifier Discussion Digest V4 #167
From: rhyasonb@cadvision.com (Bryan Rhyason)
Date: Tue, 22 May 2001 18:08:06 -0700
Hello ;I am selling a new Pl-172 tube,socket & chimney plus a new Eimac
3CX-1000 tube & socket. these belonged to a S/K friend.
anyboby know what the market value is today?
all replies will be appreciated
bryan rhyason ve6na

-----Original Message-----
From: owner-amps-digest@contesting.com
[mailto:owner-amps-digest@contesting.com]
Sent: May 21, 2001 8:45 PM
To: amps-digest@contesting.com
Subject: RF Amplifier Discussion Digest V4 #167



RF Amplifier Discussion Digest  Monday, May 21 2001  Volume 04 : Number 167



In this issue:

    Re: [AMPS] Dirty Output
    Re: [AMPS] Dayton and Reflector
    [AMPS] OK smart guys...Generator frequency regulation query....
    Re: [AMPS] Dayton and Reflector

See the end of the digest for information about amps-digest

----------------------------------------------------------------------

To: <amps@contesting.com>
Date: Mon, 21 May 2001 08:12:09 +0100
From: "Steve Thompson" <g8gsq@qsl.net>
Subject: Re: [AMPS] Dirty Output

- -----Original Message-----
From: Firson Maryutenli <firson@hotmail.com>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: 21 May 2001 03:32
Subject: [AMPS] Dirty Output


>
>Hello..
>
>I was building pre amp. to drive 4-400A in class AB1 for radio frequencies
>in 3.800 Khz. The pre amp is 6L6 in class A with passive grid input, and
>have tuned output in 3.800 Khz.
>
>The problem is, I was feeding relative clean signal in grid of 6L6 (the
>nearest harmonic in 3.930 Khz minus 70 db below desired signal 3.800 khz).
>But the output result in 6L6 there is sporious generated in 3.825 Khz,
3,850
>Khz, 3.875 with peak only minus 20 db under desired signal in 3.800 Khz.


Sounds like it is oscillating at 25kHz. Try a different valve, and check the
lf decoupling. Try putting a few ohms resistance in series with any lf
capacitors.

Steve

------------------------------

To: <amps@contesting.com>
Date: Mon, 21 May 2001 03:10:43 -0700
From: 2 <2@vc.net>
Subject: Re: [AMPS] Dayton and Reflector

>
>I just arrived home back from Dayton. I am still going to all my email
>(about 450).
>I had the pleasure to meet many of you in Dayton and thank you all for the
>kind words, not a single negative comment! It is my pleasure to run this
>reflector and most of you understand that the reflector is run the
following
>way:  It's running on hardware that's privately funded, a network
connection
>that's privately funded, and run by a moderator in his spare time for free

------------------------------

To: <amps@contesting.com>
Date: Mon, 21 May 2001 07:30:14 -0400
From: "Bob Duckworth" <wb4mnf@atl.org>
Subject: [AMPS] OK smart guys...Generator frequency regulation query....

OK smart (power systems) guys..

Generator, speced at 60Hz at 3600RPM
I can control prime mover speed to nominal 3600 but what
about fine tune? field doesn't need much current, can I rotate
field (electronically)

Lets say I have a fixed load.
Do field current requirements change with speed for a
constant current, or is it just the required torque (to keep
input power constant) that changes?

At the extreme, generator not turning, all the power transferred
must come from the field. So, I can see that at the extreme, I'd
be limited by the field current limitations of the generator.
This would suggest that I'd have to derate if only spinning at 3000
RPM (50Hz) with the coill spinning at 600RPM (to get me back
up to 60Hz) Is this so? How much to derate.

OTOH
What if I'm spinning at 6000 RPM (100Hz) and spin coil in opposite
direction to bring back down to 60Hz. Do I still have to derate?


- -bob



------------------------------

To: <amps@contesting.com>
Date: Mon, 21 May 2001 09:58:22 -0700
From: 2 <2@vc.net>
Subject: Re: [AMPS] Dayton and Reflector

>
>>
>>I just arrived home back from Dayton. I am still going to all my email
>>(about 450).
>>I had the pleasure to meet many of you in Dayton and thank you all for the
>>kind words, not a single negative comment! It is my pleasure to run this
>>reflector and most of you understand that the reflector is run the
following
>>way:  It's running on hardware that's privately funded, a network
connection
>>that's privately funded, and run by a moderator in his spare time for free
>
?  My reply question was deleted from the above.
Here's a repeat --

??  Hello, Will --  Is 450 e-mails higher than normal?
tnx

- -  R. L. Measures, 805.386.3734, www.vcnet.com/measures.
end

------------------------------

End of RF Amplifier Discussion Digest V4 #167
*********************************************


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