Fred,
I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA
transistors can produce cleaner signals. Doing so reduces any IR drop
on power supply wiring by a factor of 2 or 3. KISS.
IC's are going to lower and lower voltages. Multiple circuits within
boxes require a menagerie of voltages. One is faced with having to
generate more heat in regulators dropping 40 volts to 12, maybe 5, 3.3
and 1.6 V. Perhaps the era of efficient multivoltage power supplies
with multiple wires for multiple voltages will return. (Remember
filament ,plate, screen and grid voltage power supplies in days of
yore? Guys generally didn't mistakenly hook up the 3500 V B+ wire to
the filaments......)
73 de Brian/K3KO
On 10/2/2015 19:54 PM, Fred Townsend wrote:
Joe, I am familiar with Kelvin sensing, otherwise known as 4 wire or remote
sensing. Its advantages are probably outweighed by the risks of misconnecting and
filtering needed for RF environments. With <4 feet of 10 ga wire I don't see
significant voltage drops. I prefer KISS.
73
Fred, AE6QL
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Joe Subich, W4TV
Sent: Friday, October 2, 2015 12:33 PM
To: Eric Swartz - WA6HHQ, Elecraft; [email protected]
Subject: Re: [Elecraft] SS30DV feedback
On 10/2/2015 12:33 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
The SS30DV has +/- bolt terminals on the rear. The K3S is supplied
with a power cable using ring lugs for these bolts on one end, and an
APP connector for the K3S on the other.
Very good! How about remote sensing terminals/connector on the next iteration of the
K3/K3S - ideally on the KPA3 <G>?
73,
... Joe, W4TV
On 10/2/2015 12:33 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
The SS30DV has +/- bolt terminals on the rear. The K3S is supplied
with a power cable using ring lugs for these bolts on one end, and an
APP connector for the K3S on the other.
One other note, at the 100W operating level, we do not see any
significant voltage drop across the APP conn.
73,
Eric
/elecraft.com/
On 10/2/2015 8:53 AM, Joe Subich, W4TV wrote:
I prefer a PS with black and red connectors so I can connect any
cable and don´t worry about connectors.
Quality *bolt* terminals will generally show less voltage drop in
transmit than the wiping contacts like PowerPole connectors. That is
particularly true when the PowerPoles are not assembled correctly and
there is less than full pressure between the wiping contacts.
I would prefer any power supply and transceiver with greater than 5A
current rating use 1/4" or 3/8" stub bolted connections like the
Astron RS-35A/RS-35M and potentially provide a voltage sense
connection to support load sensing for supplies that support it or
can be modified to support it.
73,
... Joe, W4TV
On 10/2/2015 11:33 AM, Jorge Diez - CX6VM wrote:
Hello Matt
Thanks for the Info.
I have two SEC-1235M and I hate the terminal screws, I think they
are aluminum and I broke them if removing power cable too much times
I prefer a PS with black and red connectors so I can connect any
cable and don´t worry about connectors.
Thanks!
Jorge
CX6VM/CW5W
-----Mensaje original-----
De: Matt Zilmer [mailto:[email protected]] Enviado el: viernes,
02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: [email protected]
Asunto: Re: [Elecraft] SS30DV feedback
Hi Jorge,
I have both power supplies here - SS30DV and the Samlex SEC1235M.
Except for the 1235 having voltage and current meters (the SS30 does
not), there is little difference in performance. One thing that
might affect your decision is that the 1235 has an (internally)
adjustable output voltage.
The SS30DV is fixed at 14.1V.
I run full power with a K3 and with a KX3/KXPA100 with either power
supply, and no isssues found with either one.
73,
matt
W6NIA
On Fri, 2 Oct 2015 09:18:32 -0300, you wrote:
Hello
I will appreciate feedback from users of the SS30DV power supply
with a
K3
Are you happy with it? With full power on the K3, the SS30DV is
running comfortable? IS noisy?
If you compare for example with a Samlex SEC-1235M, what do you think?
Thanks very much
73,
Jorge
CX6VM/CW5W
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