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K3 with Samlex PS ??

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callen1155

K3 with Samlex PS ??

Hello guys.

After using a battery for 9 months with my K3/100 I need to spend some money and get a power supply. I've decided on the Samlex 1235 which seems to get good reviews. The question I'd like to ask has to do with whether you'd recommend the 'Metered' version or not (has both V and I analog meters)? I've read in a few places where (on some units) the meter's may cause some addition RFI. Not a lot of difference in price so that's not an issue. Any Samlex owners care to comment?

Thanks for any feedback.
chuck
af4xk

Scott Ellington

Re: K3 with Samlex PS ??

I've been using the Samlex 1235 with my K3, with no problems. So far, I've not detected any RF from it.

However, it does NOT have built-in overvoltage protection, which means if anything goes wrong with its voltage regulator it could fry your radio. I prefer not to take that chance, so I built an external overvoltage protector for it:

http://www.ssec.wisc.edu/~scotte/hr/OVP.pdf

So far, it has worked fine, aside from one shutdown when I turned on the supply at high line voltage. I set the OVP to trip at 14.5 V, with the power supply set to 13.8. It might be better to set the trip point to 15.0.

Scott K9MA

On Oct 15, 2010, at 1:42 PM, callen1155 wrote:

> ello guys.
>
> After using a battery for 9 months with my K3/100 I need to spend some money
> and get a power supply. I've decided on the Samlex 1235 which seems to get
> good reviews. The question I'd like to ask has to do with whether you'd
> recommend the 'Metered' version or not (has both V and I analog meters)?
> I've read in a few places where (on some units) the meter's may cause some
> addition RFI. Not a lot of difference in price so that's not an issue. Any
> Samlex owners care to comment?
>
> Thanks for any feedback.
> chuck
> af4xk

Scott Ellington
Madison, Wisconsin
USA

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Steve Ellington

Re: K3 with Samlex PS ??

In reply to this post by callen1155

I've got the Samlex 1235 with the meters. One of the meters was way off
calibration. When the fan kicks on, it's really loud. I quit using the thing
and got a nice Astron 35m which is totally silent. I hate fan noise.

N4LQ
Steve

----- Original Message -----
From: "callen1155" <[hidden email]>
To: <[hidden email]>
Sent: Friday, October 15, 2010 2:42 PM
Subject: [Elecraft] K3 with Samlex PS ??

>
> Hello guys.
>
> After using a battery for 9 months with my K3/100 I need to spend some
> money
> and get a power supply. I've decided on the Samlex 1235 which seems to get
> good reviews. The question I'd like to ask has to do with whether you'd
> recommend the 'Metered' version or not (has both V and I analog meters)?
> I've read in a few places where (on some units) the meter's may cause some
> addition RFI. Not a lot of difference in price so that's not an issue. Any
> Samlex owners care to comment?
>
> Thanks for any feedback.
> chuck
> af4xk
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-with-Samlex-PS-tp5639994p5639994.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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Scott Ellington

Re: K3 with Samlex PS ??

AD5X tested the Samlex 1235, and also describes a very simple mod to run the fan continuously at low speed. With the mod, the fan probably won't run at the high speed during normal operating. If your K3 is drawing enough current to turn on the PS fan, the K3 fans will probably be running fast, too.

http://www.ad5x.com/images/Presentations/SEC1235M%20Review.pdf

73,

Scott K9MA

On Oct 15, 2010, at 2:20 PM, Steve Ellington wrote:

> I've got the Samlex 1235 with the meters. One of the meters was way off
> calibration. When the fan kicks on, it's really loud. I quit using the thing
> and got a nice Astron 35m which is totally silent. I hate fan noise.
>
> N4LQ
> Steve

Scott Ellington
Madison, Wisconsin
USA

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Steve Ellington

Re: K3 with Samlex PS ??

Tried that. It was also too loud. The K3's fan is quiet. I also have the
little MFJ switcher. It is also too loud but good enough for occasional use
in the workshop.
N4LQ
Steve

----- Original Message -----
From: "Scott Ellington" <[hidden email]>
To: <[hidden email]>
Sent: Friday, October 15, 2010 4:11 PM
Subject: Re: [Elecraft] K3 with Samlex PS ??

> AD5X tested the Samlex 1235, and also describes a very simple mod to run
> the fan continuously at low speed. With the mod, the fan probably won't
> run at the high speed during normal operating. If your K3 is drawing
> enough current to turn on the PS fan, the K3 fans will probably be running
> fast, too.
>
> http://www.ad5x.com/images/Presentations/SEC1235M%20Review.pdf
>
> 73,
>
> Scott K9MA
>
> On Oct 15, 2010, at 2:20 PM, Steve Ellington wrote:
>
>> I've got the Samlex 1235 with the meters. One of the meters was way off
>> calibration. When the fan kicks on, it's really loud. I quit using the
>> thing
>> and got a nice Astron 35m which is totally silent. I hate fan noise.
>>
>> N4LQ
>> Steve
>
> Scott Ellington
> Madison, Wisconsin
> USA
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html