could be, probably the caps, but it also sounds allot like a regulator
failing.
if the voltage is wandering all over the place like that, then the regulator
isn't doing it's job, and that isn't just some caps.
I can see maybe a few volts of fluctuation when a load is put on the supply
if the caps were going...but he said down to 2 or 3 volts? that's a
regulator.
Probably a pretty cheap fix if you want to go that route Tom...maybe
trickier to fix yourself if your not used to soldering etc...but the
regulator components are pretty simple.
73
Colin, V A6BKX
----- Original Message -----
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, June 01, 2012 8:15 PM
Subject: Re: Could it be time to replace My old trusty Astron RS35 Power
Supply?
> It's probably the capacitors going in it, that happens after a while and
> they're easy to replace only held to the board with a couple screws. Parts
> can still be gotten. I know a few who've had that problem. If you decide
> to
> get a new one, probably another of the same thing is your best bet or
> going
> up on the amperage though I used to run all that and then some off mine
> and
> it never complained. If you get to the point you just don't want to deal
> with it and do want to buy something else, Let me know, if my front steps
> don't cost too much I'll buy it off you and fix it up for a backup.
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, June 01, 2012 9:54 PM
> Subject: Could it be time to replace My old trusty Astron RS35 Power
> Supply?
>
>
>> Hi, folks.
>>
>> I know we have had similar discussions on the list before, but tonight I
>> feel I have discovered something that may be of interest to others.
>>
>> Basically, over the past few days, I have found that even when
>> transmitting
>> on the resonant frequency of an antenna with a 1.0 to 1 SWR, my TS590
>> seems
>> to fold back to an output power of approximately 50 watts. These power
>> readings have been obtained from both the meter on the TS590, and my TW1
>> talking watt meter.
>>
>> I thoroughly checked all coax and DC power connections, but everything
>> seemed ok.
>>
>> I measured the power supply's voltage first with no load, and it was
>> 13.35
>> volts consistently. However, when I transmitted in RTTY mode with 100
>> watts, thereby putting a full load into the circuit, the DC voltage
>> readings
>> started fluctuating all over the place. They ranged from a high of 10
>> volts, to as low as 2 or 3 volts. Then, on a whim, I connected the
>> Kenwood
>> PS53 power supply that I got with the Kenwood 570 I purchased from the
>> estate sale in our area, and the output power readings were a very solid
>> 100
>> watts, even when the rig was keyed down continuously for several minutes.
>>
>> I know there is a way to adjust the voltage in the RS35, but with the
>> foldback of the ts590, and the fluctuations in voltage readings, I'm now
>> getting a bit nervous about using the RS35 as my main supply.
>>
>> Does anyone have any thoughts or similar experiences to report?
>>
>> If I do need to be in the market for a new power supply, I have several
>> requirements:
>>
>> 1. I'd like it to be a linear supply
>>
>> 2. I'd like it to be something that could deliver at least 40 amps
>> continuously through my rigrunner, because I sometimes run the TS590, my
>> TMV71A, and my TMV7A packet set-up simultaneously.
>>
>> If anyone has specific suggestions regarding a supply that I might wish
>> to
>> consider, please let me know.
>>
>> 73 from Tom Behler: KB8TYJ
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