Hi Vic and All, another hazard with the so called MHV connector is the HV
wire is not captivated.
Some of the flexible HV wires are quite fragile and can break off at the
point they are soldered to the connector. I have the scars on my left hand
to prove the point.
In addition to the SHV connectors, there is a series called EHV made in a
similar way. One of these has a longer center connection and higher voltage
rating (I forget which)..
Both of these connectors are a vast improvement over the MHV series as they
can be used with RG8/RG213 or RG58 coax cable and securely clamp the
shield. A piece of heat shrink will add even more security to the shield
connection. Both require a mating chassis feed thru or cable mounted mating
connector.
I am using the higher voltage rated connector in a twt power supply to
supply voltage via RG213 coax cables to a remote twt. I found that they worked
well with the 4500vdc collector voltage but not well with the 9kv cathode
voltage. At 9kv the male connector arced internally.
The higher voltage required construction of a homebrew feed thru that works
well but is somewhat ugly.
73,
Gerald K5GW
In a message dated 10/27/2013 10:20:53 P.M. Central Daylight Time,
akozak@hourglass.com writes:
Just FYI, from Wikipedia:
MHV connectors are presently considered by some as a safety hazard because
of the possibility of high voltage on the exposed central pin when not
plugged in,[1] and because the ground connection is broken before the power
connection when demating. SHV connectors are designed to prevent these
hazards, and cannot be mated to BNC connectors.
Always have liked the idea of separate power supplies but have always
worried about the safety of interconnects. The one other person I know who
did
this did not use any connectors for the HV. Accomplished the goal
decoupling the supply from the amp, but requires tools and time to move either
chassis more than the length of the umbilical away from each other.
Al
AB2ZY
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Vic K2VCO
Sent: Sunday, October 27, 2013 11:03 PM
To: Amps reflector
Subject: [Amps] 4CX1000A project
I've added a few more photos to my 4CX1000A amplifier page at
<http://www.qsl.net/k2vco/4CX1000A/K2VCO%204CX1000A%20Amplifier.html>
I finished the wiring as well as testing and adjusting the Tetrode Boards,
which include the screen and bias regulators and trip circuits, the warmup
timer, etc. I have not yet applied HV, which I intend to do when I'm
fresh, and after I've cooked the tube with heater voltage only for a while.
I'm working on adding fans to a '1000 watt' Drake dummy load to use for
testing.
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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