I meant to send this earlier. I hope everyone had a very Merry Christmas and wishing you a Happy new Year. Many thanks for the help in 2006.
Garry - WR4R
|
I need a clear, crisp copy of the schematic for an AL80-A. It is dead
and I am going to attempot a fix. Any help will be appreciated.
|
For My Liberal Friends:
"Please accept with no obligation, implied or implicit, our best wishes
for an environmentally
conscious, socially responsible, low-stress,
non-addictive, gender-neutral
celebration of the winter solstice
holiday, practiced within the most enjoyable
traditions of the religious
persuasion of your choice, or secular practices of
your choice, with
respect for the religious/secular persuasion and/or
traditions of
others, or their choice not to practice religious or
secular traditions
at all. We also
wish you a fiscally successful, personally
fulfilling
and medically
uncomplicated recognition of the generally
accepted
calendar year 2007, but not without due respect for the calendars
of
choice of other cultures whose contributions to society
have helped make
America great. Not to imply that America
is necessarily greater than any
other country nor the only America
in the Western Hemisphere, and
without regard to the race, creed, color, age, physical
ability,
religious faith or sexual
preference of the wishes. By accepting these
greetings you are accepting these terms. This greeting
is subject to
clarification or withdrawal.
It is freely transferable with no
alteration
to the original greeting. It implies no
promise by the wisher
to actually implement
any of the wishes for herself or himself or
others, and is void where prohibited by law and is
revocable at the sole
discretion of the wisher. This wish is warranted to
perform as expected
within the usual
application of good tidings for a period of one year or
until the issuance of a subsequent holiday greeting,
whichever comes
first, and warranty is limited to replacement of this
wish or issuance
of a new wish at the sole discretion of the
wisher."
For My Conservative Friends:
Merry Christmas and a Happy New Year
|
Seasons Greetings to all from the land down under.
Hope Santa leaves plenty of goodies for all.
VK4HR
|
Occasionally this amplifier will show no grid current with drive
present. As drive is increased the plate voltage drops in a linear
manner. With no RF drive present plate voltage is normal at about
3kv. When operating in this condition the amplifier will show some
output when tuned, typically about 10-20 watts and no more. Prior to
further troubleshooting here does this sound like a familiar issue? The
problem is intermittant in nature.
K6TLA
|
Have all of you a happy Christmas, and my sincere wishes for a very good 2007. I also wish to thank you for the assistance.
With best regards
Guillermo - LU8EYW.
|
--- In ham_amplifiers@..., R L Measures <r@...> wrote:
On Dec 23, 2006, at 5:45 AM, David C. Hallam wrote:
4. The exciter's carrier suppression is degraded if I turn down
the RF drive. ### The IMD from ur HT-33/37 is gonna be horendous as is..negating any advantage of the tetrode linear behind it. BTW... a yaesu MK- V.. properly tweaked in analog ESSB mode [not dsp mode] is an easy - 75 db of cxr suppression.... and an easy -100db od cxr suppression when in standard 300-2800 hz mode.` ### The mic gain control is NOT a power output control.. never was. ## If u want to easily drive the new tetrode amp .. use a 9:1 un un and use a 450/500 ohm termintaing resistor.[typ on a 4CX- 10,000D7. Instead of an attenuator.... just use a 50 ohm termination resistor. My buddy across town uses a 50 ohm globar on the grid of his 4CX-1500B.... 1500w pep output.. with 10-20 watts of drive. With a 200 ohm globar and a 4:1 un un.... u could drive it with next to nothing. ### IF ur Hallicrafter doesn't have a power output control... [none of those tube rigs did]... inject an adjustable dc voltage into the alc jack... then u can adjust it top any power output u want.... and zero alc overshoots... and worrying abt alc time constants in a linear... since u have already established the alc voltage from a small regulated.. adjustable outboard supply. Carrier's are okay. ### Nobody can hear ur cxr.. or anybody elses cxr.... UNLESS they or u, are off freq. Which brings up another point with these older rigs.... they drift like crazy. I replaced the .5ppm tcxo in my mk- v with the .25 ppm tcxo... and at 20 mhz.... zero drift... not one hz. With a tuning rate of just 312 hz per knob revolution... and a readout in .625 hz increments... zero beating someone is a snap... unless they are drifting badly.. then u gotta chase em all over the band. me.. I just stay put.... let them do the work. Later... Jim VE7RF
David
|
On Dec 23, 2006, at 5:45 AM, David C. Hallam wrote: Rich,
In regard to your suggestions of increasing the screen voltage to
750V or
turning down the drive, these are my problems.
1. The screen, bias, and HV supplies are already built. The screen
supply
is 550V zener shunt regulated. Adding zeners is easy. I don't think the transformer has the output
to increase the voltage by any significant amount, i.e., more than 50V or
so. I could run some tests and see. What type of rectifier config.?
2. The bias supply would operate at -170V, but I don't think it has
enough
head room to supply the necessary voltage to bias the tube to cut
off in
stand by with 750V on the screen. In stand by it puts out about
-220V.
¨C220V will cut one off. In
addition to supplying the grid bias, I use it to hold in a relay that
operates the relay for HV and screen primary power. That way if
the bias
fails for any reason, HV and screen voltage are removed from the tube. Good move, David.
3. I could reduce the drive by turning down the audio gain but
really don't
want to operate that way.
A better way of avoiding grid-I is needed.
4. The exciter's carrier suppression is degraded if I turn down the RF
drive.
Carrier's are okay.
David
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 4:38 PM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 7:50 AM, David C. Hallam wrote:
Rich,
So what you are saying is that it really doesn't matter from the
tube's
input impedance stand point what value of resistor I use. Correct, but since it takes 170v peak RF V to drive the grid from ¨C
170v up to 0v, the higher the grid terminating R, the leas RF power
will be needed to reach 0v.
I am running 3KV on the anode and 550V on the screen. According to
the
constant current curve, -105V should give me 250 mA ZSAC or 50% of
the max
dissipation, so I need about 95V of drive across the resistor.
It takes +105v-pk of RF drive to overcome ¨C105V of grid bias. Why
not use more screen V ?
Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer
supposedly good
for 150W continuous. However, it is only flat up to 25MHz. The
same
transformer with a slightly different tap position for 2.25:1 is
supposed to
be good up to 30MHz.
If I go to the 4:1 and use a 200 ohm resistor, I have to look at an
attenuator for the exciter to keep from overdriving the amp.
Why not turn down the power output, David ?
David
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. ¨C170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95
volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
|
Re: The Making of a DeForest Triode -- YouTube Video
I saw that Steve. Very impressive. However, I think its neat what you can do
when you have the right equipment to perform the job. I guess Phillips was
pretty instrumental in providing the necessary tools and raw materials.
Mod-U-Lator,
Mike(y)
W3SLK
toggle quoted message
Show quoted text
----- Original Message -----
From: "Steve Cook" <vaj4378@...>
To: <ham_amplifiers@...>
Sent: Saturday, December 23, 2006 2:41 PM
Subject: [ham_amplifiers] The Making of a DeForest Triode -- YouTube Video
The making of a DeForest triode in 2006
Steve (((WG7K)))
Tucson, AZ
|
The Making of a DeForest Triode -- YouTube Video
The making of a DeForest triode in 2006
? Steve (((WG7K))) Tucson, AZ
Want to start your own business? Learn how on
|
All boat anchors here. Either a Hallicrafters HT-32B or Johnson Invader 200
will be used.
David
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of Jan Erik Holm
Sent: Saturday, December 23, 2006 9:05 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
What kind of exciter are you using?
Jim SM2EKM
-------------
David C. Hallam wrote:
3. I could reduce the drive by turning down the audio gain but
really don't
want to operate that way.
4. The exciter's carrier suppression is degraded if I turn down the RF
drive.
David
Yahoo! Groups Links
|
What kind of exciter are you using?
Jim SM2EKM
-------------
David C. Hallam wrote:
toggle quoted message
Show quoted text
3. I could reduce the drive by turning down the audio gain but really don't
want to operate that way.
4. The exciter's carrier suppression is degraded if I turn down the RF
drive.
David
|
Rich,
In regard to your suggestions of increasing the screen voltage to 750V or
turning down the drive, these are my problems.
1. The screen, bias, and HV supplies are already built. The screen supply
is 550V zener shunt regulated. I don't think the transformer has the output
to increase the voltage by any significant amount, i.e., more than 50V or
so. I could run some tests and see.
2. The bias supply would operate at -170V, but I don't think it has enough
head room to supply the necessary voltage to bias the tube to cut off in
stand by with 750V on the screen. In stand by it puts out about -220V. In
addition to supplying the grid bias, I use it to hold in a relay that
operates the relay for HV and screen primary power. That way if the bias
fails for any reason, HV and screen voltage are removed from the tube.
3. I could reduce the drive by turning down the audio gain but really don't
want to operate that way.
4. The exciter's carrier suppression is degraded if I turn down the RF
drive.
David
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 4:38 PM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 7:50 AM, David C. Hallam wrote:
Rich,
So what you are saying is that it really doesn't matter from the
tube's
input impedance stand point what value of resistor I use. Correct, but since it takes 170v peak RF V to drive the grid from
170v up to 0v, the higher the grid terminating R, the leas RF power
will be needed to reach 0v.
I am running 3KV on the anode and 550V on the screen. According to
the
constant current curve, -105V should give me 250 mA ZSAC or 50% of
the max
dissipation, so I need about 95V of drive across the resistor.
It takes +105v-pk of RF drive to overcome 105V of grid bias. Why
not use more screen V ?
Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer
supposedly good
for 150W continuous. However, it is only flat up to 25MHz. The same
transformer with a slightly different tap position for 2.25:1 is
supposed to
be good up to 30MHz.
If I go to the 4:1 and use a 200 ohm resistor, I have to look at an
attenuator for the exciter to keep from overdriving the amp.
Why not turn down the power output, David ?
David
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. 170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
|
On Dec 22, 2006, at 7:50 AM, David C. Hallam wrote: Rich,
So what you are saying is that it really doesn't matter from the
tube's
input impedance stand point what value of resistor I use. Correct, but since it takes 170v peak RF V to drive the grid from ¨C 170v up to 0v, the higher the grid terminating R, the leas RF power will be needed to reach 0v.
I am running 3KV on the anode and 550V on the screen. According to
the
constant current curve, -105V should give me 250 mA ZSAC or 50% of
the max
dissipation, so I need about 95V of drive across the resistor.
It takes +105v-pk of RF drive to overcome ¨C105V of grid bias. Why not use more screen V ?
Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer
supposedly good
for 150W continuous. However, it is only flat up to 25MHz. The same
transformer with a slightly different tap position for 2.25:1 is
supposed to
be good up to 30MHz.
If I go to the 4:1 and use a 200 ohm resistor, I have to look at an
attenuator for the exciter to keep from overdriving the amp.
Why not turn down the power output, David ?
David
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. ¨C170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
|
Ditto Jan,
Couldn't agree more! And he takes nice, detailed pictures too!
Merry Christmas & Happy New Year to you and to all!!
Garry - WR4R
Jan Erik Holm wrote:
toggle quoted message
Show quoted text
Since I have forgot/lost my Yahoo password/ID and the
lot for my ordinary email address I havent been able
to sign in and view the pictures.
Finaly I signed in with a new Yahoo ID and it was nice
to be able to see the pictures.
I must say that VE7RF sure built a very nice amplifier!!
Sure would have been nice if my junk amps was that nice.
Maybe I should post some pictures just to show that some
stuff isnt nice looking? But it works just fine.
Merry Christmas and Happy New Year to you all
Jim SM2EKM
|
I would really like to keep the exciter looking at 50 ohm so the amp could
be switched in and out without retuning.
David
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of Robert B. Bonner
Sent: Friday, December 22, 2006 11:25 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
Use ALC that would control exciter power. BOB DD
Sent From Mobile Device
-----Original Message-----
From: "David C. Hallam" <dhallam@...>
Date: Fri, 22 Dec 2006 10:50:18
To:<ham_amplifiers@...>
Subject: RE: [ham_amplifiers] 4CX1500A
Rich,
So what you are saying is that it really doesn't matter from the tube's
input impedance stand point what value of resistor I use.
I am running 3KV on the anode and 550V on the screen. According to the
constant current curve, -105V should give me 250 mA ZSAC or 50% of the max
dissipation, so I need about 95V of drive across the resistor.
Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer supposedly good
for 150W continuous. However, it is only flat up to 25MHz. The same
transformer with a slightly different tap position for 2.25:1 is
supposed to
be good up to 30MHz.
If I go to the 4:1 and use a 200 ohm resistor, I have to look at an
attenuator for the exciter to keep from overdriving the amp.
David
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. 170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
Yahoo! Groups Links
|
Use ALC that would control exciter power. BOB DD
Sent From Mobile Device
toggle quoted message
Show quoted text
-----Original Message----- From: "David C. Hallam" <dhallam@...> Date: Fri, 22 Dec 2006 10:50:18 To:<ham_amplifiers@...> Subject: RE: [ham_amplifiers] 4CX1500A Rich, So what you are saying is that it really doesn't matter from the tube's input impedance stand point what value of resistor I use. I am running 3KV on the anode and 550V on the screen. According to the constant current curve, -105V should give me 250 mA ZSAC or 50% of the max dissipation, so I need about 95V of drive across the resistor. Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer supposedly good for 150W continuous. However, it is only flat up to 25MHz. The same transformer with a slightly different tap position for 2.25:1 is supposed to be good up to 30MHz. If I go to the 4:1 and use a 200 ohm resistor, I have to look at an attenuator for the exciter to keep from overdriving the amp. David -----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. ¨C170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
Yahoo! Groups Links
|
Rich,
So what you are saying is that it really doesn't matter from the tube's
input impedance stand point what value of resistor I use.
I am running 3KV on the anode and 550V on the screen. According to the
constant current curve, -105V should give me 250 mA ZSAC or 50% of the max
dissipation, so I need about 95V of drive across the resistor.
Jerry Sevick's W2FMI has a trifilar wound 2:1 transformer supposedly good
for 150W continuous. However, it is only flat up to 25MHz. The same
transformer with a slightly different tap position for 2.25:1 is supposed to
be good up to 30MHz.
If I go to the 4:1 and use a 200 ohm resistor, I have to look at an
attenuator for the exciter to keep from overdriving the amp.
David
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]On Behalf Of R L Measures
Sent: Friday, December 22, 2006 9:42 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] 4CX1500A
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote:
Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over
1,000,000-ohms in AB1, and the reactive component is 78pF. With
750V on the screen, it takes c. 170 grid V to establish a ZSAC of
200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to
drive a 4CX1500A. With a 50-ohm termination, 289w is needed.
I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un
probably isn't very easy to make.
cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
Yahoo! Groups Links
|
On Dec 22, 2006, at 5:11 AM, David C. Hallam wrote: Does anyone have information as to the approximate input impedance
of a
4CX1500A for the proper value of a passive grid resistor for this
tube? D. -- The resistive component of the grid input Z is well over 1,000,000-ohms in AB1, and the reactive component is 78pF. With 750V on the screen, it takes c. ¨C170 grid V to establish a ZSAC of 200mA. If the grid is terminated in 200-ohms, 73w-pep is needed to drive a 4CX1500A. With a 50-ohm termination, 289w is needed. I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so
will
have to use a balun to maintain 50 ohm for the exciter. I just
wondered how
close a 100 ohm resistor would be. 50 to 200 ohm un-uns are a piece of cake, but a 50 to 100 ohm un-un probably isn't very easy to make. cheerz
David
KC2JD
R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org
|
Does anyone have information as to the approximate input impedance of a
4CX1500A for the proper value of a passive grid resistor for this tube? I
need about 100 ohm to get sufficient grid drive, i.e., 95 volts, so will
have to use a balun to maintain 50 ohm for the exciter. I just wondered how
close a 100 ohm resistor would be.
David
KC2JD
|
