[Elecraft] SS30DV feedback

Fri Oct 2 16:12:04 EDT 2015

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: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe Subich, W4TV
> Sent: Friday, October 2, 2015 12:33 PM
> To: Eric Swartz - WA6HHQ, Elecraft; elecraft at mailman.qth.net
> 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:mzilmer at roadrunner.com] Enviado el: viernes,
>>>> 02 de octubre de 2015 12:13 p.m.
>>>> Para: Jorge Diez - CX6VM
>>>> CC: elecraft at mailman.qth.net
>>>> 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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>>>> Matt Zilmer, W6NIA
>>>> --
>>>> "Always store beer in a dark place."  -R. Heinlein
>>>>
>>>>
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>>
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