[Elecraft] K3 with Samlex PS ??

[Scott Ellington]

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