ASTRON RS-35A MANUAL PDF

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” 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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Supplies rated for 12A or less RS and under usually have 3-way binding posts on the rear for output terminals. The Astron website appears to only have a catalog and no support information.

If you don’t find the schematic for your Astron below, then we were awtron given manuual. Many repeater owners try to be conservative, and keep the actual current draw from their supplies well below the rated maximum, in an effort to make the supply run cool and last long. The circuitry is similar for the different prefixes and suffixes.

I recently purchased the venerable Astron RSA, one of the most popular amateur radio power supplies. Since there are significant voltages exposed ra-35a those terminals, things ought to be mechanically secured.

manuaal 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 adtron work well enough for a long period of time on a supply that is used in a fixed location, as this one is likely to be used. They’ll even ship it to you and let you remit payment after you receive it.

Rs-335a has since added some parts to the design; these are NOT reflected in this schematic or the parts list below. You may have to download more than one schematic to get the one that matches your supply, and you may not find your schematic at all as we only have the ones that were donated to us. The wires more-or-less held things in place, sort of.

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There is hysteresis on this pin to prevent chattering about 2 volts difference between off and on. He scanned then redrew and astfon the schematic so it matched the actual unit; this drawing can be found as a PDF file below.

It shows a 7 amp load. This supply is also sold under the Uniden name as their model ARX The problem had been there for years but it was due to a fault in the way the substation was designed. I have seen this happen with a substation where we have this gigantic buried ground mesh. I fully expect mine to last a lifetime. May 18, Capacitor out of its mounting bracket. A local copy can be found here. ds-35a

Astron RSM Manual

As more current is drawn from the supply, more heat is produced. The continuous current is somewhere between 50 and 80 percent of the peak current. A trailing “M” indicates front manuaal Meters. If you desire an adjustable dropout, add a 30k trim pot to the board in series with the existing 62k resistor.

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Astron RS35A 35 Amp Power Supply

The job they did on stripping insulation and soldering is ugly. Each one is dated on the individual drawing. If you find one somewhere else that we don’t have, we’d appreciate a scan. A trailing “” indicates the supply operates on V line voltage.

Also checked negative side of DC output: The mmanual side is common. The voltage charts on most of the schematics follow this scheme. It is a traditional linear power supply, consisting of a big, heavy transformer operating at 60Hz, a rectifier, a filter capacitor, a linear regulator, and a bank of linear pass transistors.

Maybe I need to try someone else there. 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. There was an extra “line” drawn between the collector of the TIP29 and the base connections of the pass transistors. It ended up being mamual one ground conductor that was not bonded correctly,it was a MCM cable that had 6 volts at amps running through manua.

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The only way to find gs-35a is to try it I guess. 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.

Fortunately everything but the filter caps, transformer, and sheet metal are common Mouser or DigiKey parts, and I bet you could find the capacitors if you tried hard enough.

Astron sent me a manual in e-mail. See the comments in the battery backup section above concerning this particular supply. Older units had a fixed cord, but current units use an IEC power inlet. A conversion list of Motorola to Astron model numbers can be found here. The Astron catalog has these derated current specs.

Astron Power Supply Index Page

This, effectively, shorted out the regulator driver Q2. With the mod I’ve only had the fan go to full speed i. For example, a VS50M supply is rated for 37A continuous at Repairing the Astron RSA http: It also charges the battery and works with 12 and 24V systems.

It appears you have a handle on operating the unit, even to the point of correcting meter errors. Astron makes both linear and switching power supplies, and some other products. He replaced them with digital meters and created a web page about installing them.

The fan thermostat switches DC from the output to power the fan.