[ARC5] Power supply voltages for ARC-5 receivers

[Bob Groh]

Very nice, Dennis.

Bob Groh

On Tue, Feb 4, 2020 at 5:14 PM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> You might disconnect a few caps one at a time via the chassis grounding
> screw and measure the leakage current. I just slip a business card between
> the chassis and the bathtub cap.  Assuming you wish to keep it original,
> how much those caps leak will determine how much voltage you can get away
> with.
>
> I run mine off around 60 to 70V.  It pulls 10mA at 60V and allows the use
> of a stack of 9V batteries (50 hr life) for portable or simply to avoid
> bringing the line noise near it.
>
> Dennis AE6C
>
> On Sun, Feb 2, 2020 at 12:47 PM Bob Groh <bob.groh at gmail.com> wrote:
>
>> Thanks to all for the responses.  Pretty much gives me exactly what I
>> need - 140 VDC and up to ??200 VDC at 60 mA or so.  Lower is probably
>> better given the age of most of these radios.  Works for me.
>>
>> Bob, WA2CKY
>>
>> On Sun, Feb 2, 2020 at 2:43 PM Doran Platt <jeepp at comcast.net> wrote:
>>
>>> FWIW, I use 140v and it appears to be a sweet spot.  No genuine loss of
>>> sensitivity specs , although audio gain is down ever so slightly.
>>> K3HVG
>>>
>>> On February 2, 2020 at 12:51 PM Bill Cromwell < wrcromwell at gmail.com>
>>> wrote:
>>>
>>>
>>> Hi Bob,
>>>
>>> RE: your other post: I have seen ads (not from commercial resellers)
>>> offering a radio here and there on the list. The sky did not fall:)
>>>
>>> Some of us use 90 volts B+ (including me) and some others suggest 180
>>> volts is better. It seems somewhere from 90 to 180 works very well. Some
>>> people have used B+ as low as 12 or 24 volts but even with bias
>>> modifications to the radio they said performance was "a little less".
>>> The 200 volts plus from the dynamotors is NOT needed. In the high
>>> altitude bombers it may have helped keep the radios warm. Most of us use
>>> them at or near room temperature :) In those bombers temps were well
>>> below zero F.
>>>
>>> 73,
>>>
>>> Bill KU8H
>>>
>>> On 2/2/20 11:19 AM, Bob Groh wrote:
>>>
>>> The design is not the problem but I wonder if there is any consensus on
>>> the B+ voltage and current?  Filament is fairly easy to figure out so
>>> that is not a problem.  Thanks.
>>>
>>> Bob Groh, WA2CKY
>>>
>>>
>>>
>>> --
>>> bark less - wag more
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