I've heard others telling similar stories, so I hope I am going heavy
enough. I have an old ferroresonant transformer for the low voltage
supply that runs hot anyway, but is capable of at least 50 amps, so it
should do fine. My problem with this supply is I ain't no spring
chicken anymore and
Thoise autotune motors draw a LOT of current.
I built a power supply with an 8 Amp transformer from FAIR RADIO
for mine back in the 1980s.
MAN that transformer ran HOT,... even with no load!
> From what I understand the filaments and auto tune on the ART-13
> transmitter require about 10 amps.
W5OMR/Geoff wrote:
27v * 10amps = 270w. You got something that's gonna be pulling that
much current?
Rick Brashear wrote:
From what I understand the filaments and auto tune on the ART-13
transmitter require about 10 amps. It's gonna be a big supply when
I'm through, no doubt.
From what I understand the filaments and auto tune on the ART-13
transmitter require about 10 amps. It's gonna be a big supply when I'm
through, no doubt.
Rick
W5OMR/Geoff wrote:
27v * 10amps = 270w. You got something that's gonna be pulling that
much current?
--
Geoff/W5OMR
W5OMR/Geoff wrote:
10 *Amps*?
You mean 10 Henry, at about a half an amp, right?
Rick Brashear wrote: I think I need about a 10 mH @ 10 amp choke for
the 27 volt supply. Of course, I could be calculating wrong.
27v * 10amps = 270w. You got something that's gonna be pulling that
I think I need about a 10 mH @ 10 amp choke for the 27 volt supply. Of
course, I could be calculating wrong.
Rick
W5OMR/Geoff wrote:
10 *Amps*?
You mean 10 Henry, at about a half an amp, right?
--
73 = Best Regards,
-Geoff/W5OMR
___
Let me be sure I am correct in my calculations. Choke input (5 - 25 H)
with 4 mfd filter will allow about 5% ripple. Now, when I add the
second choke (5.5 H) and the second filter (2 mfd) is this now
calculated as a capacitor input for this last stage? If so, then it
would result in another
Rick Brashear wrote:
Thanks Jim and all who replied. I'll check one of my older Handbooks
and see if I can match up the choke with suitable capacitors to get
the ripple as low as possible.
I'm also going to need a 10 amp choke for the low voltage supply.
10 *Amps*?
You mean 10 Henry, at
> If you use 4 uf. and 5 H with choke input, it says the ripple percent will
> approximate 4%. Usually 5% is where most people go since it takes such
> large values to exceed that.
Yipes - 5% ripple on a 400V supply - won't that give you about
20V of AC buzz on your carrier?
Thanks Jim and all who replied. I'll check one of my older Handbooks
and see if I can match up the choke with suitable capacitors to get the
ripple as low as possible.
If anyone has a 5 - 25 swinging choke they'd be interested in dealing I
am in need of another one. I'm also going to need a
Rick pick up and old ARRL handbook. I have a 56 year version and it has
charts that will help you determine the percent of ripple with various
combinations of L and C.
If you use 4 uf. and 5 H with choke input, it says the ripple percent will
approximate 4%. Usually 5% is where most people g
Rick, IN my AN/ART-13, I'm using a 4H .25 amp choke in my B+.. no
problem. It consists of (2) 10uF 2kv oil cans with the choke in the
negative lead (upside down pie, along with 100K bleaders). No problems
so far .. any questions, feel free klc
- Original Message -
From:
Hi:
I am finally building the power supply for my ART-13 transmitter and
would like your opinion on a thing or two. Thanks to Ronnie Hull, I
have a 5 - 25 henry swinging choke for the HV supply. I also have,
thanks to an old TX-1, a 400 ma smoothing choke, 5.5 henry @ 400 ma. I
wanted to u
Yeah, Todd, now that you're back on 40 & 75M, it's time to put up a wire for
160M!
Hey Phil, come up and say hello to us on the Gray Hair Net sometime. It's
been quite a while...
73,-Larry/NE1S
Phil Galasso writes:
Welcome back, Todd! I don't normally work 75 meters, but come on down to
1
On 5/2/06, Phil Galasso <[EMAIL PROTECTED]> wrote:
Welcome back, Todd! I don't normally work 75 meters, but come on down to
160. I usually hang out on 1885, often early in the evening this time of the
year, as I can evade the static by getting on early...yet there is plenty of
skywave from 1, 2,
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Jim Candela wrote:
--- W5OMR/Geoff <[EMAIL PROTECTED]> wrote:
What was that rig, Jim? Something like a single
4D32 modulated by a
pair of 811's, or something similar? It was stout
*and* had plenty of
'presense' ;-)
Reply by Jim, WD5JKO:
No the modulator was solid state, and was a
Strange that you mentioned this, John. I almost posted about these
wire elements earlier, mainly out of curiousity. The RA-1000 I picked
up last September came with one of these for a dummy load. One mesh
sheet or element, maybe 2-3 feet long by 1 foot or so wide. Surrounded
by a metal frame with
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