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

Mon Jul 2 17:33:26 EDT 2007

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ドル 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ドル 
> (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ドル.
>>> -------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ドル.95)
>> MFJ-4125 - regulated, switching, 13.8 VDC at 25 amps
> surge, 22 amps continuous (List Price 109ドル.95)
>> Kenwood KPS-15 - switching, 13.8 VDC at 25 amps surge,
> or 23 amps continuous? (List Price 143ドル.55)
>> Suggestions???
>> Thanks & 73,
>> Steve N5WBI
> Houston TX

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