[Elecraft] SS30DV feedback OT

[Charlie Delta]

 Very impressive indeed.  Pre-distortion will hopefully  be made available as a 
option for the K3 in the future. 
That would be a superb option if it does become available.

What these results however do confirm is  that pre-distortrion is worth  
implimenting and that it does work very well.
 
The work by N1JEZ also confirms that current LDMOS amplifiers do not have 
acceptable levels of IMD performance, especially at  higher powers.
 In my opinion based on the IMD data by N1JEZ they are inherently   very  
dirty. I have not seen a working example 
of a LDMOS amplifier that I would consider clean when compared against even a 
pair of 3-500's. I have  studied the  NXP datasheets for these devices
 and have found that LDMOS devices like the BLF574 can produce excellent IMD 
performance. The BLF574 according to the data sheet at 200 watts of ouput and 
1200ma of  idle current is capable of -40dbc 3rd order IMD performance. I have 
not seen data for the higher order products but this figure is good.

I have been working on a  homebrew LDMOS solid state amplifier for my K3 and 
have  not decided what devices I will use in the design. I do have a 
MRF150/EB104 amplifier that works very well and it has very good IMD 
performance. I would like to try these LDMOS designs. I wont however waste 
effort on a marginally poor IMD PA. Homebrewing is a lot of effort and I cant 
see the point of spending dollars and time  on any project when it does not 
meet acceptable technical standards like IMD performance..

 I wonder when we will see pre-distortion in a commercial ham radio tranceiver 
outside of the experimental devlopments like HPSDR. Is Elecraft working
on a pre-distortion implimentation?

73
Craig

"With bias, 12V transistors are class B or AB, not C. 
See http://flarc.net/eme-info/PDF/N1JEZ-2.pdf. 
Ignacy, NO9E"

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Re: [Elecraft] SS30DV feedback

[Jorge Diez - CX6VM]

Thanks very much for the feedback from SS30DV users

I think I have good recommendation for it. 

Now QRT

73,
Jorge
CX6VM/CW5W

-Mensaje original-
De: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] En nombre de Joe Subich, W4TV
Enviado el: sábado, 03 de octubre de 2015 10:19 a.m.
Para: elecraft@mailman.qth.net
Asunto: Re: [Elecraft] SS30DV feedback


> If higher voltages are needed to clean up the amp, how about a DC to 
> DC converter.

How about a higher voltage battery system rather than added complexity in
the transceiver?

73,

   ... Joe, W4TV


On 10/3/2015 12:54 AM, Bill Frantz wrote:
> As I run my K3 from batteries at home, and am about to run in from 
> batteries in Sierra county for the California QSO party -- no 
> generators permitted where we are. I need battery power for my normal
operations.
> If higher voltages are needed to clean up the amp, how about a DC to 
> DC converter.
>
> 73 Bill AE6JV
>
> On 10/2/15 at 2:10 PM, rmcg...@blomand.net (Bob McGraw - K4TAX) wrote:
>
>> To me the real solution is to incorporate an internal power supply.
> -
> Bill Frantz| Re: Hardware Management Modes: | Periwinkle
> (408)356-8506  | If there's a mode, there's a   | 16345 Englewood Ave
> www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, CA 
> 95032
>
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> li...@subich.com
>
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Re: [Elecraft] SS30DV feedback

[Joe Subich, W4TV]

If higher voltages are needed to clean up the amp, how about a DC to
DC converter.


How about a higher voltage battery system rather than added complexity
in the transceiver?

73,

  ... Joe, W4TV


On 10/3/2015 12:54 AM, Bill Frantz wrote:

As I run my K3 from batteries at home, and am about to run in from
batteries in Sierra county for the California QSO party -- no generators
permitted where we are. I need battery power for my normal operations.
If higher voltages are needed to clean up the amp, how about a DC to DC
converter.

73 Bill AE6JV

On 10/2/15 at 2:10 PM, rmcg...@blomand.net (Bob McGraw - K4TAX) wrote:


To me the real solution is to incorporate an internal power supply.

-
Bill Frantz| Re: Hardware Management Modes: | Periwinkle
(408)356-8506  | If there's a mode, there's a   | 16345 Englewood Ave
www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, CA 95032

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Re: [Elecraft] SS30DV feedback OT

[Ignacy]

With predistortion coming sooner or later to mainstream radios, higher PA
voltage for 100W is dead issue. 
Ignacy 



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Re: [Elecraft] SS30DV feedback OT

[Ignacy]

With bias, 12V transistors are class B or AB, not C. 

See http://flarc.net/eme-info/PDF/N1JEZ-2.pdf. 

He describes an amp changed to Class B (very low bias for little heating).
Regular IMD3 -22db. After predistortion -55db. Plus extra db in additional
power power. All for a cost of feedback + some programming. 

With predistortion we can get more power (drive closer to saturation) with
less heating (higher efficiency and lower quiescent current) and less IMD.
All for a cost of hardware feedback + programming.  

I am all for 50V (or higher) for high power amps. 


Ignacy, NO9E



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Re: [Elecraft] SS30DV feedback OT

[Joe Subich, W4TV]

On 10/3/2015 10:14 AM, Ignacy wrote:

With predistortion coming sooner or later to mainstream radios, higher PA
voltage for 100W is dead issue.
Ignacy



Higher voltage PA and predistortion are completely separate items. Even
with predistortion, good engineering principles mean higher voltage
transistors one should be used for 100W class rigs.

Most 50 or 60 W "12V" transistors are class C devices (a pair for "100
W") ... predistortion is not going to make class C finals clean enough
for reasonable SSB.  Modern "12V" radios are 10 dB or more dirtier than
older generation tube transceivers.

73,

  ... Joe, W4TV
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Re: [Elecraft] SS30DV feedback

[ae4pb]

I just got mine with my K3S and haven’t even noticed it other than the power 
lamp being on. No issues or power drops at full power out. 

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jorge Diez - CX6VM
Sent: Friday, October 02, 2015 8:19 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] SS30DV feedback

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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[Elecraft] SS30DV feedback

[Jorge Diez - CX6VM]

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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Re: [Elecraft] SS30DV feedback

[Jorge Diez - CX6VM]

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:mzil...@roadrunner.com] 
Enviado el: viernes, 02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: elecraft@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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>
>This list hosted by: http://www.qsl.net Please help support this email 
>list: http://www.qsl.net/donate.html Message delivered to 
>mzil...@roadrunner.com
Matt Zilmer, W6NIA
--
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Re: [Elecraft] SS30DV feedback

[Marty Koszewski]

I have similar spur issues, approx 30khz apart, with the SS30DV on 40 & 80 
meters as well.   I do not get any noise from my Samlex 1235M using the same 
power cabling and same installation location.  I will try the suggested toroid 
solution to see if I can get rid of the spurs.   I do prefer the connectors of 
the SS30DV.

Marty, K1MTK



On Oct 2, 2015, at 11:50 AM, Rick Stealey  wrote:

We had spurs all over the 80 meter band here on the K3S station that is being 
run as a remote, approximately 30 khz apart.   The main station 50 ft away (but 
on different antennas spaced 100 feet) had no noise.  At first we suspected the 
OCF dipole, then the networking boxes, then the laptop.  Put a gelcel in place 
of the PS and voila!So it was the SS30 PS.  5 turns of the K3 power cord around 
a type 31 2.4 inch diameter toroid took all the noise right out.
Rick  K2XT
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Re: [Elecraft] SS30DV feedback

[Matt Zilmer]

I didn't much like the Euro-style clamping terminals either.  I built
a short pigtail to 30A APP, and just leave the terminals alone.
They're not robust enough for constant plugging in/out.

The Samlex here is powered 100% of the time.  Its output goes to a
solar charge controller used to maintain SOC on an Optima 75 AH
battery.  The charge controller has two inputs, and the other one is
connected to 100W of solar PV on the roof.  All the power terminations
in this setup are APP.

The SS30DV has two APP terminations on the front of the unit, and a
1/4" / banana lab-style termination on the rear.  You might like this
arrangement better than the Samlex.  Elecraft sells the SS30DV too.

73,
matt
W6NIA

On Fri, 2 Oct 2015 12:33:26 -0300, you 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:mzil...@roadrunner.com] 
>Enviado el: viernes, 02 de octubre de 2015 12:13 p.m.
>Para: Jorge Diez - CX6VM
>CC: elecraft@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
>>
>>
>>
>>---
>>El software de antivirus Avast ha analizado este correo electrónico en
>busca de virus.
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>>__
>>Elecraft mailing list
>>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>Help: http://mailman.qth.net/mmfaq.htm
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>>
>>This list hosted by: http://www.qsl.net Please help support this email 
>>list: http://www.qsl.net/donate.html Message delivered to 
>>mzil...@roadrunner.com
>Matt Zilmer, W6NIA
Matt Zilmer, W6NIA
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Re: [Elecraft] SS30DV feedback

[Matt Zilmer]

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
>
>
>
>---
>El software de antivirus Avast ha analizado este correo electrónico en busca 
>de virus.
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>
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Re: [Elecraft] SS30DV feedback

[Rick Stealey]

We had spurs all over the 80 meter band here on the K3S station that is being 
run as a remote, approximately 30 khz apart.   The main station 50 ft away (but 
on different antennas spaced 100 feet) had no noise.  At first we suspected the 
OCF dipole, then the networking boxes, then the laptop.  Put a gelcel in place 
of the PS and voila!So it was the SS30 PS.  5 turns of the K3 power cord around 
a type 31 2.4 inch diameter toroid took all the noise right out.
Rick  K2XT
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Re: [Elecraft] SS30DV feedback

[Joe Subich, W4TV]

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:mzil...@roadrunner.com]
Enviado el: viernes, 02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: elecraft@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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Re: [Elecraft] SS30DV feedback

[Eric Swartz - WA6HHQ, Elecraft]

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:mzil...@roadrunner.com]
Enviado el: viernes, 02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: elecraft@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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Re: [Elecraft] SS30DV feedback

[Jorge Diez - CX6VM]

Thanks all and Eric for the feedback

73,
Jorge
CX6VM/CW5W

-Mensaje original-
De: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] 
En nombre de Eric Swartz - WA6HHQ, Elecraft
Enviado el: viernes, 02 de octubre de 2015 01:34 p.m.
Para: Joe Subich, W4TV; elecraft@mailman.qth.net
Asunto: Re: [Elecraft] SS30DV feedback

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:mzil...@roadrunner.com] Enviado el: viernes, 
>> 02 de octubre de 2015 12:13 p.m.
>> Para: Jorge Diez - CX6VM
>> CC: elecraft@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
>>>
>>>
>>>
>>> ---
>>> El software de antivirus Avast ha analizado este correo electr nico 
>>> en
>> busca de virus.
>>> https://www.avast.com/antivirus
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft@mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net Please help support this 
>>> email
>>> list: http://www.qsl.net/donate.html Message delivered to 
>>> mzil...@roadrunner.com
>> Matt Zilmer, W6NIA
>> --
>> "Always store beer in a dark place."  -R. Heinlein
>>
>>
>> ---
>> El software de antivirus Avast ha analizado este correo electr nico 
>> en busca de virus.
>> https://www.avast.com/antivirus
>>
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft@mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net Please help support thi

Re: [Elecraft] SS30DV feedback

[Joe Subich, 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.


Very good!  How about remote sensing terminals/connector on the next
iteration of the K3/K3S - ideally on the KPA3 ?

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:mzil...@roadrunner.com]
Enviado el: viernes, 02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: elecraft@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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list: http://www.qsl.net/donate.html Message delivered to
mzil...@roadrunner.com

Matt Zilmer, W6NIA
--
"Always store beer in a dark place."  -R. Heinlein


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Re: [Elecraft] SS30DV feedback

[Fred Townsend]

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-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
Sent: Friday, October 2, 2015 12:33 PM
To: Eric Swartz - WA6HHQ, Elecraft; elecraft@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 ?

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:mzil...@roadrunner.com] Enviado el: viernes, 
>>> 02 de octubre de 2015 12:13 p.m.
>>> Para: Jorge Diez - CX6VM
>>> CC: elecraft@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
>>>>
>>>>
>>>>
>>>> ---
>>>> El software de antivirus Avast ha analizado este correo electrónico 
>>>> en
>>> busca de virus.
>>>> https://www.avast.com/antivirus
>>

Re: [Elecraft] SS30DV feedback

[brian]

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-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
Sent: Friday, October 2, 2015 12:33 PM
To: Eric Swartz - WA6HHQ, Elecraft; elecraft@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 ?

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:mzil...@roadrunner.com] Enviado el: viernes,
02 de octubre de 2015 12:13 p.m.
Para: Jorge Diez - CX6VM
CC: elecraft@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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--
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Re: [Elecraft] SS30DV feedback

[Bob McGraw - K4TAX]

Fred et al:

I would agree.  When used with decent power cables, good connectors 
properly applied and overall length of 4 ft or so, remote sensing will 
likely bring more issues to the table than necessary. Additional wiring, 
additional connectors and filtering required to keep RF out and the 
overall system stable.


Now if one has to run DC power 20 to 30 ft then remote sensing is most 
likely necessary.


73
Bob, K4TAX

On 10/2/2015 2:54 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



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Re: [Elecraft] SS30DV feedback

[Bob McGraw - K4TAX]

To me the real solution is to incorporate an internal power supply. I 
agree that higher PA voltages will produce cleaner transmitters. 
Therefore multiple voltages, no problem,  minimized ground loop issues, 
reduce number of cables.  Only one box to transport as opposed to two.  
No extra cables to forget or have a cable with wrong connectors.I 
recall reading recently about a fellow that connected his radio in a 
reverse polarity condition.  With an internal PS, this wouldn't 
occur.Since we have to have a PS after all, why not just make it 
internal.


73
Bob, K4TAX

On 10/2/2015 3:12 PM, brian wrote:

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/K3



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Re: [Elecraft] SS30DV feedback OT

[Fred Townsend]

Brain yes I recall tubes and the multiple power supply requirements. I even 
designed to a few. I also remember how rough it was to do mobile power supplies 
where the HV came from either vibrators or dynamotors. Then it was transistors 
and everything went to 13.85V. But transistor output tanks were never the same 
because transistor class C tank coils couldn't handle the current so we went to 
low Q tanks with class B outputs. 

Around 2002-2003 there was SAE group called 42Volt. They stated by 2007 that 
the AC compressor, water pump, and power steering would be electrically driven 
and therefore the automotive industry must switch to 42 volts (basically three 
12v batteries in series). I couldn't wait for 42 volts to work its way into ham 
radio. By 2007 the group had disbanded. My guess is hybrids killed 42V because 
they wanted to keep the accessories powered by the engine and not the hybrid 
battery.

The K2 and K3 are dual desktop and mobile radios. Perhaps it is time for a 
desktop only radio with HV FET finals with a built in power supply. Also a 42V 
mobile with its own add-on alternator and quiet down converter for the receiver 
and LEDs. 
73
Fred, AE6QL

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Friday, October 2, 2015 1:12 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SS30DV feedback

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-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, 
> W4TV
> Sent: Friday, October 2, 2015 12:33 PM
> To: Eric Swartz - WA6HHQ, Elecraft; elecraft@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 ?
>
> 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-1235

Re: [Elecraft] SS30DV feedback

[Eric Swartz - WA6HHQ, Elecraft]

We're hitting the posting limit on this one. Let's wind it down in the next 3-4 
posts at most. Then thread closed for now.


Eric
/elecraft.com/

On 10/2/2015 4:32 PM, Joe Subich, W4TV wrote:



Doing so reduces any IR drop on power supply wiring by a factor of 2
or 3.


Higher voltage - 24 or 40 V results in decreasing the voltage drop by a
factor or 4 or 9.  The voltage drop is a function of current *squared*.

24 or 48 volt finals certainly produce much cleaner signals as the
active devices are not likely to be driven into current saturation
*or* cutoff in order to reach useful power output where the 12V devices
are pushed to the wall to make 100W output.

73,

  ... Joe, W4TV


On 10/2/2015 4:12 PM, brian wrote:

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



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Re: [Elecraft] SS30DV feedback

[Joe Subich, W4TV]

Doing so reduces any IR drop on power supply wiring by a factor of 2
or 3.


Higher voltage - 24 or 40 V results in decreasing the voltage drop by a
factor or 4 or 9.  The voltage drop is a function of current *squared*.

24 or 48 volt finals certainly produce much cleaner signals as the
active devices are not likely to be driven into current saturation
*or* cutoff in order to reach useful power output where the 12V devices
are pushed to the wall to make 100W output.

73,

  ... Joe, W4TV


On 10/2/2015 4:12 PM, brian wrote:

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



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Re: [Elecraft] SS30DV feedback

[Bill Frantz]

As I run my K3 from batteries at home, and am about to run in 
from batteries in Sierra county for the California QSO party -- 
no generators permitted where we are. I need battery power for 
my normal operations. If higher voltages are needed to clean up 
the amp, how about a DC to DC converter.


73 Bill AE6JV

On 10/2/15 at 2:10 PM, rmcg...@blomand.net (Bob McGraw - K4TAX) wrote:


To me the real solution is to incorporate an internal power supply.

-
Bill Frantz| Re: Hardware Management Modes: | Periwinkle
(408)356-8506  | If there's a mode, there's a   | 16345 
Englewood Ave
www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, 
CA 95032


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