[Kenwood] RE: Power Supply for TS-130S

Tue Jul 3 13:54:55 EDT 2007

Aaron's right!
I fooled around for quite a long time now with various switchers also'
including the revamping a few defunct computer power supplies to operate as
13.8 V supplies up to about 30 amps. All of them had noise problems: in
their case this is simply switching noise and its harmonics.
All in all clamping on the cable or alternatively stringing on it some
ferrite sleeves garnered from discarded monitors' video cables reduces the
noise to quite manageable levels. Just remember: you have to install them on
both the input cord AND the output otherwise you get swamped by the
conducted emission running along the power in line and getting radiated
ouside the box.
Another good source is to get some old deflection yoke from dead TV set and
use them as cores.
Alex	4Z5KS

-----Original Message-----
From: kenwood-bounces at mailman.qth.net
[mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Hsu, Aaron (NBC
Universal)
Sent: Tuesday, July 03, 2007 12:33 AM
To: Kenwood Reflector
Subject: [Kenwood] RE: Power Supply for TS-130S

Let me clarify that the SS-30M's hash is pretty low compared to others.
The worst offenders right now are the small wall-wart switchers used to
power/charge various household devices and personal electronics (such as
cell phones).  The power adapter for Toshiba laptops (15v @ 2A/3A/5A
depending on size) puts out an S5 hash every 30KHz or so on several bands.
It sounds like the noise floor goes up (then down) 20dB+ for a few KHz as
you're tuning up or down the band - kinda like surf on a beach.  Unplug the
adapter and no hash.  And it's not isolated to one particular Toshiba power
adapter...I've tried a few dozen.

BTW, there was a review of several switching supplies a few years ago in QST
- they included RFI measurements.  I believe one of the Astron switchers (25
or 30) measured the lowest of the group.

73,

  - Aaron, NN6O

-----Original Message-----
From: kenwood-bounces at mailman.qth.net
[mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Rob Atkinson
Sent: Monday, July 02, 2007 1:00 PM
To: Kenwood Reflector
Subject: Re: [Kenwood] RE: Power Supply for TS-130S

I have run a TS850 off of an Astron SS30M and had no problems at all.  
Perhaps it's the bands I have operated it on:  160, 75 and 40.  I am 
under the impression that Astron at least, is making switching supplies 
that are not noisy.  Perhaps I am mistaken about that, but the SS30M 
powered the 850 effortlessly at 1/2 the cost of a PS52.   It's cabinet 
is about 1/3 the size, and probably 1/10 the weight and I bet it is 
much more efficient.  3 or 4 years ago I paid $250 for a PS52 to run my 
TS870.  It is a fine Kenwood linear supply but I felt like a fool after 
I bought it.  That was probably my last linear supply purchase.

73

rob / k5uj

On Monday, July 2, 2007, at 11:43  AM, Hsu, Aaron (NBC Universal) wrote:

> The Astron RS-35A is a great choice and can be had for under $130 
> (shop around or to go a HAM fest/swap).  The main advantage of the 
> RS-35A is that it's a linear power supply - no RF hash of any kind.  
> But, it's quite heavy - lots of copper in that transformer!
>
> Switching power supplies are convenient and *light*, but are RF noisy 
> by design.  Some companies filter out the hash quite well, but others 
> don't do such a good job.  I have both RS-35's and a SS-30M switcher 
> for portable use.  I can hear the SS-30M's hash on a Kenwood TS-850, 
> but it doesn't bother some other rigs which may not be as RF > sensitive.
>
> Given the choices listed below, I'd go with "none of the above" and 
> choose an Astron SS-30M (for compactness) or an RS-35A if it's not 
> going anywhere.
>
> 73,
>
>   - Aaron Hsu, NN6O
>
>
>
> -----Original Message-----
>
>
>      You left out the best - Astron RS-35A, around $150.
>
>
> -------Original Message-------
>
> From: Steve Ponder - N5WBI
> Subject: [Kenwood] Power Supply for TS-130S
>
> I will be purchasing a "gently used" TS-130S from
> another ham. What type of power supply do I need
> for it?
>
> The TS-130S Instruction Manual states ...
>
> "The TS-130SE requires more than 18A at 13.8 VDC
> when transmitting with full power. Use the model
> PS-30 power supply for fixed stations."
>
> Since finding a functional PS-30 power supply might
> be hard, what other power supplies would be compatible?
> Would a switching power supply work?
>
> How about ...
>
> MFJ-4322 - regulated, switching, 13.8 VDC at 22 amps
> surge, or 20 amps continuous? (List Price $99.95)
>
> MFJ-4125 - regulated, switching, 13.8 VDC at 25 amps
> surge, 22 amps continuous (List Price $109.95)
>
> Kenwood KPS-15 - switching, 13.8 VDC at 25 amps surge,
> or 23 amps continuous? (List Price $143.55)
>
> Suggestions???
>
> Thanks & 73,
>
> Steve N5WBI
> Houston TX

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