” TIP CAS. I ca IN ICAO. PвKE. | 39A. LM CR3 |. 3 A4. | IN 1 tci +. CI01 +. R8. 3 K. 10v. SCRI I. Astron Observations. Longevity. Family of RS supplies – all the same design Astron RSM Astron is inconsistent – some do, and some don’t. Don’t rely on . Here is an annotated schematic of the Astron RSM detailing the workings of the various parts of the Astron circuit. The annotations were originally written in.

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A trailing “M” indicates front panel Meters. A trailing “” indicates the supply operates on V line voltage. How to contact Icom America Technical Support: Close up of the soldering on the astrom of one of the pass transistors. I’m thinking maybe the Astron should be set that way too if iCOM designed their “system” that way.

That website, as its name suggests, is oriented toward repeater use. The fan noise can be annoying at manjal, so I’ve modified my supplies to make it less so.

Converting a RS or RM to a VS or VM usually involves adding two potentiometers to the front panel and making the wiring changes shown in the schematic. Newer supplies possibly starting around have illuminated meters. If Astron had the schematic library on their web site we wouldn’t need to. However, I suggest you Google this for a more detailed and no doubt better way of doing this.

No manual is really needed but thought if one existed I would just store rs3-5a. With the mod I’ve only had the fan go to full speed i. Numbers in many of the schematics below, particularly the pin numbers on the regulator IC, may be blurry.


There was clearly a bracket for the big blue cylindrical capacitor to fit into, but the capacitor was not secured into its bracket. This slow speed is enough to keep the supply cool with very little noise. Further info is available here. Notice the regulator IC is in a socket, making it easy to replace if necessary.

We’ll see you in a couple of weeks it’s that deep of a bench. Everything else gets replaced with a completely different design.

N5PA Website – RSA Power Supply

It appears you have a handle on operating the unit, even to the point of correcting meter errors. The draftsman obviously started with the RS-7 schematic; he forgot to adjust the voltage table.

As for manuals, I wasn’t aware they had one or why a person would need one. The right side heatsink has the fan thermostat mounted to it.

Astron RSM Manual

Again, not exactly beautiful, but functional. The problem had been there for years but it was due to a fault in the way the substation was designed. This, effectively, shorted out the regulator driver Q2. I switched it on and just checked unloaded voltage with my DVM When I opened the supply up and took a look inside, I found a few things that seemed a bit ugly to me, even though they would probably work well enough for a long period of time asteon a supply that is used in a fixed location, as this one is manua to be used.

They’ll even ship it to you and let you remit payment after you receive it. A trailing “S” indicates there’s a Speaker inside the case. Ds-35a, Kenwood, Motorola, Uniden and Vertex. 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 look at the Astron RS-35A

I purchased my supply from HRO in February of A trailing “R” seems to be used for power supplies that were sold with a chassis that could accept a mobile radio, usually only found on the SL-series. Sorry I just had to. SLS- are Switching Special-voltage power supplies, usually 28 volt. Each heatsink has a thermostat, the left side heatsink has a normally closed 50 degree C thermostat for the AC input – don’t bother it. A conversion list of Motorola to Astron model numbers can be found here. A new series of videos is being posted for common repairs and educational for troubleshooting.


Astron sent me a manual in e-mail.

The Astroh website appears to only have a catalog and no support information. Icom America does answer their telephone for support calls.

While the Astron Linear PS designs have changed through the years — largely due to changes in electronic components RoHS, obsolescence, etc. Primary Menu Skip to content. I fully expect mine to last a lifetime. Back to the top of the page Back to Home. Before installing this mod simply running my PII on receive was enough to turn on the fan every 5 minutes or so. See the comments in the battery backup section above concerning this particular supply.

All Rights Reserved, including that of paper and web publication elsewhere. Their schematics are further down the page. Astron makes both linear and switching power supplies, and some other products.

For example, a VS50M supply is rated for 37A continuous at The last I checked Astron website had schematics of all their linear power supplies. The model number is constructed from a prefix lettersa peak current value digitsand a suffix letters.

The continuous current is somewhere between 50 and 80 percent of the peak current.

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