My 3CX3000F7 does well on 2m.
73
Peter
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Steven Simons
Sent: Donnerstag, 6. Februar 2020 03:59
To: amps@contesting.com
Subject: [Amps] 3xx3000 at 144. Re: Amps Digest, Vol 206, Issue 9
Conrad,
I built a 150MHz amp using a 3cX20000 for an industrial customer. This tube
is rated at 110mhz buts worked fine at 150. Did 24kw out - could have gotten
close to 30 but ran out of drive. So, the 3cx3000 should work at 144.
de:W1SMS
Steve Simons
Manitou Systems Inc.
Tel.203.733.2110
ssimons@manitousys.com
Sent from my iPhone
On Feb 5, 2020, at 9:49 PM, amps-request@contesting.com wrote:
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Today's Topics:
1. Re: 3CX3000A7 on 144 MHz (Carl)
2. Re: Amp causing RFI new attempt on the original request
(Henk Remijn PA5KT)
3. Re: Amp causing RFI new attempt on the original request
(Alek Petkovic)
4. Re: Amp causing RFI new attempt on the original request
(Steven Katz)
5. Re: Amp causing RFI new attempt on the original request
(Jim Klein)
6. Re: Amp causing RFI Update (Jim)
----------------------------------------------------------------------
Message: 1
Date: Wed, 5 Feb 2020 12:11:35 -0500
From: "Carl" <km1h@jeremy.qozzy.com>
To: "Conrad PA5Y" <g0ruz@g0ruz.com>, <amps@contesting.com>
Subject: Re: [Amps] 3CX3000A7 on 144 MHz
Message-ID: <2B9590F2A566405A888E867BB25ABCB0@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
That would be a real stretch since the maximum frequency rating is 110 MHz
and even if it could be made to work efficiency would be low.
Are there any European TV tubes available at affordable prices?
Carl
----- Original Message -----
From: "Conrad PA5Y" <g0ruz@g0ruz.com>
To: <amps@contesting.com>
Sent: Tuesday, February 04, 2020 2:35 PM
Subject: [Amps] 3CX3000A7 on 144 MHz
I have just acquired 2 x 3CX3000A7 and I would like to put one on 2m.
I have a few designs for but before I start I have 2 questions.
The Heater current is 7.5V @ 51A - does anyone use a switch mode PSU?
Not
sure if Meanwell have anything suitable but that is where I would
probably
start. Otherwise I have no idea where to get a custom transformer wound
in
the Netherlands, which is where I live these days.
I do not want to run in AB2 all the time am I correct to assume that I
can
just switch in a Zener with a pass transistor to bias to class C? I have
never used a zero bias tube before.
I could use a GM3SEK triode board of course!
I already have a 4.5kV supply that will drop down to 4.2kV on load, if
anyone is using a 3CX3000A7 on VHF I would also like to know how much
gain
to expect. I do not expect the 144MHz performance to differ from that of
110 MHz based on observations with a YC-156.
Regards
Conrad PA5Y
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------------------------------
Message: 2
Date: Wed, 5 Feb 2020 18:38:48 +0100
From: Henk Remijn PA5KT <pa5kt@remijn.net>
To: amps@contesting.com
Subject: Re: [Amps] Amp causing RFI new attempt on the original
request
Message-ID: <7811a8dd-e6f8-cac9-34a9-03b96798acaf@remijn.net>
Content-Type: text/plain; charset=utf-8; format=flowed
I think this is an interesting question which deserves a better answer
then the ground loop discussion.
The Tentec is a solid state amplifier and the SB220 is using tubes.
In general tube amps are more lineair then solid state.
I would try to measure them on a spectrum analyzer to see if there is a
different in produced spectrum.
Based on that you might consider an additional filter on your amplifier.
Most likely the cheapest solution is some kind of ferrite around the
wires of the light.
73 Henk PA5KT
Op 28-1-2020 om 17:37 schreef Gary Hendricks:
I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT
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------------------------------
Message: 3
Date: Thu, 6 Feb 2020 06:47:15 +0800
From: Alek Petkovic <vk6apk@bigpond.com>
To: amps@contesting.com
Subject: Re: [Amps] Amp causing RFI new attempt on the original
request
Message-ID: <6937f0e8-bd3a-edcb-72e5-995d504ad7fa@bigpond.com>
Content-Type: text/plain; charset=utf-8; format=flowed
From 1-5 on grounding, in the Ten Tec maual.
"In the interst of personal safety and to reduce the possibility of
stray RF pickup on interconnecting cables, all station equipment should
be well grounded to earth. It is important to strap all equipment
chassis together with short heavy wire."
The SB-230 may not be as susceptible to problems, as the Ten Tec, when
it comes to grounding.
If you are getting stray RF back into the driving transmitter, then this
will be amplified and may cause any number of problems, including the
Uncle Fester light bulb effect.
73, Alek. VK6APK
On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
I think this is an interesting question which deserves a better answer
then the ground loop discussion.
The Tentec is a solid state amplifier and the SB220 is using tubes.
In general tube amps are more lineair then solid state.
I would try to measure them on a spectrum analyzer to see if there is
a different in produced spectrum.
Based on that you might consider an additional filter on your amplifier.
Most likely the cheapest solution is some kind of ferrite around the
wires of the light.
73 Henk PA5KT
Op 28-1-2020 om 17:37 schreef Gary Hendricks:
I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT
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------------------------------
Message: 4
Date: Wed, 5 Feb 2020 23:08:23 +0000
From: Steven Katz <stevek@jmr.com>
To: Alek Petkovic <vk6apk@bigpond.com>, "amps@contesting.com"
<amps@contesting.com>
Subject: Re: [Amps] Amp causing RFI new attempt on the original
request
Message-ID:
<BY5PR16MB319015BA59E569DBE90CFBF2DA020@BY5PR16MB3190.namprd16.prod.outlook.
com>
Content-Type: text/plain; charset="us-ascii"
The Hercules II uses a separate 14V 80A power supply and the
interconnecting DC power cable is hot as hell, in my experience -- having
owned one back in the 90s.
Big difference between that and the self-contained SB-230.
Steve, WB2WIK
-----Original Message-----
From: Amps <amps-bounces@contesting.com> On Behalf Of Alek Petkovic
Sent: Wednesday, February 5, 2020 2:47 PM
To: amps@contesting.com
Subject: Re: [Amps] Amp causing RFI new attempt on the original request
From 1-5 on grounding, in the Ten Tec maual.
"In the interst of personal safety and to reduce the possibility of stray
RF pickup on interconnecting cables, all station equipment should be well
grounded to earth. It is important to strap all equipment chassis together
with short heavy wire."
The SB-230 may not be as susceptible to problems, as the Ten Tec, when it
comes to grounding.
If you are getting stray RF back into the driving transmitter, then this
will be amplified and may cause any number of problems, including the Uncle
Fester light bulb effect.
73, Alek. VK6APK
On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
I think this is an interesting question which deserves a better answer
then the ground loop discussion.
The Tentec is a solid state amplifier and the SB220 is using tubes.
In general tube amps are more lineair then solid state.
I would try to measure them on a spectrum analyzer to see if there is
a different in produced spectrum.
Based on that you might consider an additional filter on your amplifier.
Most likely the cheapest solution is some kind of ferrite around the
wires of the light.
73 Henk PA5KT
Op 28-1-2020 om 17:37 schreef Gary Hendricks:
I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT
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------------------------------
Message: 5
Date: Wed, 5 Feb 2020 18:04:06 -0800
From: Jim Klein <k7rdx@charter.net>
To: Steven Katz <stevek@jmr.com>
Cc: Alek Petkovic <vk6apk@bigpond.com>, "amps@contesting.com"
<amps@contesting.com>
Subject: Re: [Amps] Amp causing RFI new attempt on the original
request
Message-ID:
<CACwjSsXV4VRTC0Jz9jhFi7XN3B3U8Lp=fJeowVSNXZ7pKo6KYw@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Many years ago in the 1970`s I ran 4-1000A amplifiers on the Low Bands.I
have a neighbor who has fluorescent lamps on his front porch and my SSB
modulation would make the lamps talk..Literally...And flash...I had very
good grounding and still had issues...Nowadays I run YC-156A amps and no
problems of any kind...Very clean tube when set-Up and run properly.
Ground
Loop is also a common problem for several Hams,follow advice from
Engineering people and solve your issues easily...Hello
all&73..Jim..K7RDX..
On Wed, Feb 5, 2020 at 3:08 PM Steven Katz <stevek@jmr.com> wrote:
The Hercules II uses a separate 14V 80A power supply and the
interconnecting DC power cable is hot as hell, in my experience -- having
owned one back in the 90s.
Big difference between that and the self-contained SB-230.
Steve, WB2WIK
-----Original Message-----
From: Amps <amps-bounces@contesting.com> On Behalf Of Alek Petkovic
Sent: Wednesday, February 5, 2020 2:47 PM
To: amps@contesting.com
Subject: Re: [Amps] Amp causing RFI new attempt on the original request
From 1-5 on grounding, in the Ten Tec maual.
"In the interst of personal safety and to reduce the possibility of stray
RF pickup on interconnecting cables, all station equipment should be well
grounded to earth. It is important to strap all equipment chassis
together
with short heavy wire."
The SB-230 may not be as susceptible to problems, as the Ten Tec, when it
comes to grounding.
If you are getting stray RF back into the driving transmitter, then this
will be amplified and may cause any number of problems, including the
Uncle
Fester light bulb effect.
73, Alek. VK6APK
On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
I think this is an interesting question which deserves a better answer
then the ground loop discussion.
The Tentec is a solid state amplifier and the SB220 is using tubes.
In general tube amps are more lineair then solid state.
I would try to measure them on a spectrum analyzer to see if there is
a different in produced spectrum.
Based on that you might consider an additional filter on your amplifier.
Most likely the cheapest solution is some kind of ferrite around the
wires of the light.
73 Henk PA5KT
Op 28-1-2020 om 17:37 schreef Gary Hendricks:
I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT
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------------------------------
Message: 6
Date: Wed, 5 Feb 2020 20:50:06 -0600
From: Jim <jimw7ry@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] Amp causing RFI Update
Message-ID: <4b14d916-0b68-ce55-07b5-7f155035ade8@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
The 500+ page Motorola R56 Grounding and bonding for Communications
manual is available for free download from Motorola On Line, or perhaps
other places on line.
The 2005 manual is the old one. The 2016 version is the current one.
It's (the 2016 version) is quite a bit larger that the 2005 version.
Thanks
73
Jim W7RY
On 2/5/2020 9:50 AM, Glen Zook via Amps wrote:
Another thing is that there are various "schools" on grounding, lightning
protection, etc., and one group of "experts" can have considerably different
opinions on proper techniques.? To compound things even more, a significant
number of "experts" recommend things from several different schools.
There are those "experts" who absolutely refuse to recognize that there
can be more than one way to "skin a cat" and get very belligerent if someone
even proposes techniques that differ even so slightly from "their" methods.?
Then, there are those "experts" who do recognize that "their" methods are
just among several other methods that can also produce an excellent
grounding system.
Over the decades, the methods that I recommend have been adopted by
certain entities such as television transmitter manufacturers and different
government agencies (from local to Federal).? But, I certainly do NOT insist
that "my" methods are the "only" correct methods.? In fact, I recommend
that, if the person so desires, various methods be examined and
complimentary techniques be included in the individual's grounding system.
Glen, K9STH
Website: https://k9sth.net
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------------------------------
Subject: Digest Footer
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------------------------------
End of Amps Digest, Vol 206, Issue 9
************************************
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