[AMPS] More Swinging Choke Observations
Phil Clements
philk5pc@tyler.net
Tue, 4 Apr 2000 13:33:38 -0500
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I just received a manual on the R.F. Communications (Harris) RF-110A =
amp.
that I am putting on the air. In the RF-124 power supply, I see =
something
that I have never seen before. Coming out of the full-wave diode bridge,
we first have a 2 Hy filter choke. Then, next in line is a .35 to 45 Hy =
swinging
choke, then a 25 mfd filter cap., and a 50k ohm bleeder resistor. I =
have never
seen a swinging choke wired AFTER a filter choke in a P.S. circuit =
before, nor
have I seen such a high value filter cap in a choke input power supply. =
A note
in the manual says the swinging choke improves the power supply voltage
regulation over the current range. The RF-110A has to be the most =
over-engineered
piece of equipment I have ever seen! In talks with some former Harris =
engineers,
it was designed for 100% duty cycle all-mode operation; especially RTTY. =
The
Mil-Spec also required -60 db IMD. The RF-124 power supply weighs 200 =
pounds!
The RF-110A is a 1 KW no-tune, 2-30 Mhz amp with 26 db gain.
(((73)))
Phil, K5PC
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<DIV><FONT face=3D"Slashed Zero Arial">I just received a manual on the =
R.F.=20
Communications (Harris) RF-110A amp.</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">that I am putting on the air. In =
the RF-124=20
power supply, I see something</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">that I have never seen before. =
Coming out=20
of the full-wave diode bridge,</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">we first have a 2 Hy filter =
choke. Then,=20
next in line is a .35 to 45 Hy swinging</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">choke, then a 25 mfd filter cap., =
and =20
a 50k ohm bleeder resistor. I have never</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">seen a swinging choke wired AFTER =
a filter=20
choke in a P.S. circuit before, nor</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">have I seen such a high value =
filter cap in=20
a choke input power supply. A note</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">in the manual says the swinging =
choke=20
improves the power supply voltage</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">regulation over the current =
range. The=20
RF-110A has to be the most over-engineered</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">piece of equipment I have ever =
seen! In=20
talks with some former Harris engineers,</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">it was designed for 100% duty =
cycle=20
all-mode operation; especially RTTY. The</FONT></DIV>
<DIV><FONT face=3D"Slashed Zero Arial">Mil-Spec also required -60 db =
IMD. The=20
RF-124 power supply weighs 200 pounds!</FONT></DIV>
<DIV>The RF-110A is a 1 KW no-tune, 2-30 Mhz amp with 26 db gain.</DIV>
<DIV> </DIV>
<DIV>(((73)))</DIV>
<DIV>Phil, K5PC</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV></BODY></HTML>
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