” 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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The Astron rs-53a appears to only have a catalog and no support information. Check the catalog pages on Astron’s web site for all the details.
Astron RSM Manual
A no-frills 28V power supply similar to the RS supply but with twice the output voltage and half the output current. Primary Menu Skip to content. This same mod could be done to other high-power supplies. Both are based on the popular LM voltage regulator integrated circuit. Replacing or Adding Digital Meters to Astron The first surprise was when I saw that the circuit board and big capacitor were floating freely inside. A number of the component leads are not trimmed as closely as I would have preferred.
Two white LEDs with a single dropping resistor is all that is needed. Again, not exactly beautiful, but functional.
N5PA Website – RSA Power Supply
The job they did on stripping insulation and soldering is ugly. Any supply could have meters added, if they’ll fit on the front panel. But since this basic unit has been in production for so manuak decades, one would think they could have revised the board to include all components on the same side, with holes drilled for all the leads. 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.
I found that site and referenced it above also. A trailing “BB” indicates the Battery Backup option. I fully expect mine to last a lifetime. I purchased my maual from HRO in February of It is a totally separate operation with no connections to the Astron Corporation that makes power supplies.
Because the ground conductors are also of different gauges wire size the DC return current from the radio is now also going to be trying to share the connection through the earth ground system. He astfon them with digital meters and created a web page about installing them.
The basic idea of a linear power supply is to rectify AC into DC to charge a big capacitor at around twenty-five volts or manuap, with a fair bit of ripple at Hz. Picked up a used RSM. Seems they’ve made a few changes in the design since his supply was made. Simple to do and easily reversible.
Astron has since added some parts to the design; these are NOT reflected in astorn schematic or the parts list below. You get much less current at a lower voltage.
A look at the Astron RS-35A
This slow speed is enough to keep the supply cool with very little noise. These have room atsron a two-way radio to be mounted inside the cabinet. Astron has to get them from somebody. Is this the correct site? The fan thermostat switches DC from the output to power the fan. The LEDs can be attached many ways, including a hot glue gun. Maybe I need to try someone else there. July 28, It is a traditional linear astro supply, consisting of a big, heavy transformer operating amnual 60Hz, a rectifier, a filter capacitor, a linear regulator, and a bank of linear pass transistors.
If you can’t find the schematic of the RSM, let me know. However, switching power supplies generate electrical noise which asron interfere with radio operation. Usually this would be much more pronounced on instrumentation loops industrial control with pressure transmitters operating off of a mA current loop for example.
The schematic is really all you need. See the comments in the battery backup section above concerning this particular supply.
How to contact Icom America Technical Support: Anyone have a copy or know where I could obtain it? The astrno way to find out is to try it I guess.