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Astron VSM DC power supply

Contact the site with comments or questions. Picked up a used RSM. Astroj all over for copy of whatever manuals might have been available but cannot find anything. The Astron website appears to only have a catalog and no support information.

Anyone have a copy or know where I could obtain it? The last I checked Astron website had schematics of all their linear power supplies. As for manuals, I wasn’t aware they had one or why a person would need one.

Astron VS-35M Variable DC Power Supply gets an upgraded MOSFET over-voltage circuit

If you can’t find astrno schematic of the RSM, let me know. No manual is really needed but thought if one existed I would just store it.

Most other manufacturer sites I have visited have PDF download files for their equipment. I cannot find anyhting on Astron’s website, except their catalog. Is this the correct site? On further searching, I found a wealth of info here: I switched it on and just checked unloaded voltage with my DVM I’ll recheck meter zero, which I think was good, and then adjust pot R inside, as necessary.

I also thought maybe my meter lights were burned out, as some have noted, but on further searching found that since my unit has a fixed power cord, it’s likely older and never had meter illumination. The schematic is really all you need. It appears you have a handle on operating the unit, even to the point of correcting meter errors. As for illuminating the meter, that is a piece of cake. Two white LEDs with a single dropping resistor is all that is needed.


The LEDs can be attached asrron ways, including a hot glue gun. However, I suggest you Google this for a more detailed and no doubt better way of doing this. Sorry I just had to.

Astron sent me a manual in e-mail. Not too much in there but you can never have too much info. I provided my serial number and they were able to tell me it was manufactured in May serial: Now I’m hoping that older units were built better and this one will last me a good long while. We’ll see you in a couple of weeks it’s that deep of a bench. I found that site and referenced it above also.

Checked earth safety ground to chassis resistance: Also checked negative side of DC output: Not sure what, if any, problems I might see as a result and am inclined to leave it alone for now.

For some new radio amateurs English is a second language, and can better understand some electronics concepts and repairs via video YouTube instruction or pictorial diagrams. A new series of videos is being posted for common repairs and educational for troubleshooting.

ASTRON RS35M Service Manual download, schematics, eeprom, repair info for electronics experts

Repairing the Astron RSA http: Dragging up an old topic. The only other related thread I found so far is: I’m thinking maybe the Astron should be set that way too if iCOM designed their “system” that way. There are also Battery “BB” versions of the power supply.

Icom America does answer their telephone for support calls. How to contact Icom America Technical Support: While the Astron Linear PS designs have changed rs-3m5 the years — largely due to changes in electronic components RoHS, obsolescence, etc.

Had a typo above corrected in red.

I had called Astron but they were not very helpful, only saying “it depends” and not offering any rationale. Maybe I need to try someone else there. The only way to find out is to try it I guess.

If you have grounds on your radio equipment at other places like the antenna, tower, coax you are creating two earthing ground return paths of different capacity and with ever so slight differences in potential. This creates what is known as a “ground loop” that can introduce AC hum in to the DC supply ground return leg. Usually this would be much more pronounced on instrumentation loops industrial control with pressure transmitters operating off of a mA current loop for example.

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When you get a transient astorn, fault, normal device switching it can behave in difficult to predict ways. Because the ground conductors are also of different gauges wire size the DC astfon current from the radio is now also going to be trying to share the connection through the earth ground system.

I have seen this happen with a substation where we have this gigantic buried ground mesh. Trying to balance out our three phase loads we noticed that there was an unaccounted for power loss.

It ended up being in one ground conductor that was not bonded correctly,it was a MCM cable that had 6 volts at amps running through it. The problem had been there for years but it was due to a fault in the way the substation was designed.

So, if you do not have any other sort of ground connection on the device you can safety bond the negative return to the earth ground. But this means that the line-cord on the power supply is also acting as the safety bond fs-35m the device I will say computer, instead of radio. If this is something like a radio or a piece of industrial process equipment where there are distributed connections to the earthing system then it aetron introduce problems.

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