[ARC5] R-508/ARC Conversion

Sat Apr 29 13:28:25 EDT 2023

Buy this instead:

https://www.amazon.com/DEVMO-45-390V-Voltage-Converter-Step-up/dp/B07T6L61D9/ref=sr_1_9?crid=1AFXCICR2L63F <https://www.amazon.com/DEVMO-45-390V-Voltage-Converter-Step-up/dp/B07T6L61D9/ref=sr_1_9?crid=1AFXCICR2L63F&keywords=DC-DC+step-up+converter+12+V+to+40-390VDC&qid=1682788948&sprefix=dc-dc+step-up+converter+12+v+to+40-390vdc%2Caps%2C521&sr=8-9> &keywords=DC-DC+step-up+converter+12+V+to+40-390VDC&qid=1682788948&sprefix=dc-dc+step-up+converter+12+v+to+40-390vdc%2Caps%2C521&sr=8-9

Look around, they can be had for less than $10.00;  12 V in 40-390 out, regulated at up to 100 mA, there is also a bipolar version (not much use here).

There are also cheap little DC-DC boost converters that will give you 24VDC from 12VDC in.  eBay and Amazon are your friend here.  BTW, I have found that little filtering is necessary, but when it is,  a simple capacitive filter usually does the trick.

I use these things in profusion and have even hacked the transformers and feedback resistor to produce different current/voltage combinations.

Scott W7SVJ

From: J Mcvey <ac2eu at yahoo.com> 
Sent: Saturday, April 29, 2023 10:13
To: n2lxm at juno.com; arc5 at mailman.qth.net; scottjohnson1 at cox.net
Cc: milsurplus at mailman.qth.net
Subject: Re: [ARC5] R-508/ARC Conversion

You can probably use the same idea as was posted here a week ago about simply using a 12v transformer for the heaters and use a voltage multiplier stack to get to 150 volts or so.

I'm going to build the 24v version and try it on an arc5 receiver. I like the simplicity of it.

The radio will work ok with reduced voltage if the ground is removed from the screen grid voltage divider and allowed to float higher. 

I suspect the voltage divider design may be similar on the R508.

BTW, I tried running an ARC 5 with the modified screen divider on 24 volts plate and it worked-poorly. The radio received , but there wasn't enough power to produce good audio output levels.

On Saturday, April 29, 2023 at 12:55:34 PM EDT, <scottjohnson1 at cox.net <mailto:scottjohnson1 at cox.net> > wrote: 

Not much to dop to convert it, give it power, put a tuning crank on it, and
a speaker, and you are good to go.
N6CC has sufficient info on his website to get you going:
n6cc.comm/type-12-am-aircraft-system/

Scott W7SVJ

-----Original Message-----
From: arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net>  <arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net> > On Behalf
Of n2lxm at juno.com <mailto:n2lxm at juno.com> 
Sent: Saturday, April 29, 2023 09:09
To: arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> 
Cc: milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net> 
Subject: [ARC5] R-508/ARC Conversion

Greetings All,

        Has anyone converted an R-508/ARC using the article in the June
1965 issue of 73 Magazine ?. I would like to get this old girl running so I
can listen in on out local airport Automated weather transmissions.

                                                    Jeff N2LXM
                                          Amateur Radio Operator
                                                      American
                                                        Patriot
                                    Proud Father of Two US Marines

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