[ARC5] AM modulating an "ARC-5" transmitter...

[Michael Bittner]

Since a 1T4 has no separate cathode element, I guess the trick was placement 
of the mic between ground and a common connection to filament minus and 
filament + via the filament battery??  Then the battery would be in the 
modulating signal path acting like a large capacitor.  I'm always intrigued 
by these circuits with miniature battery tubes.
Mike, W6MAB


----- Original Message ----- 
From: "Michael Hanz" <aaf-radio-1 at aafradio.org>
To: "jeepp" <jeepp at comcast.net>; "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Tuesday, October 13, 2015 11:05 AM
Subject: Re: [ARC5] AM modulating an "ARC-5" transmitter...


>I tried that method with my first ARC-5 transmitter, Jeep.  It 
>worked...sort of.  The reports all said the signal was very muddy with a 
>lot of distortion, but understandable.  I think the idea was in one of the 
>old CQ magazines back in the 1950s.
>
> On 10/12/2015 9:42 PM, jeep wrote:
>
>> My Elmer, a very long time ago, demonstrated the ability to modulate a 
>> 1T4 "wireless broadcaster" in an educational electronic set I got for 
>> Christmas.  He simply inserted a carbon mic in the cathode lead and, 
>> presto.. modulation in the BC radio across the room.  This thing might 
>> just work!!
>> Jeep K3HVG
>
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