[ARC5] Command Set Field Day

[hwhall at compuserve.com]

 >
The selectivity of the 40 meter receiver is much too broad (purposely) and 
really can't be much improved on, although it is certainly fun to use.
>

 Would a simple Q-multiplier help the selectivity enough? I see a 1-transistor (old PNP type) Q-mult in the 1964 ARRL Handbook. Battery powered and a single coax lead to an i.f. tube plate. The article was for a 455-500 kHz i.f. but that can be altered I imagine.

Wayne
WB4OGM



-----Original Message-----
From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: Tim <timsamm at gmail.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>
Sent: Tue, Jan 1, 2013 3:02 pm
Subject: Re: [ARC5] Command Set Field Day

 
 
 
On 1 Jan 2013 at 13:29, Tim wrote: 
 
> Hi - Thanks - Yes, Amen to all of that!  A bit dicey to operate during 
> crowded conditions but perfect for casual Camp Ops...and Vintage Field 
> Day (different weekend!).  Best of all, no synthesizer, digital phase 
> noise in the sidebands and NO MENU's!  Ha..  But the Fun Meter is 
> pegged.... 
 
Yes! Indeed! I'm with Mike on this one: show the ignorant how to do it. 
 
Actually, I have found the selectivity of the 80 meter receiver to be quite  
adequate under most conditions, especially if you modify the first IF for  
adjustable regeneration. This requires two pieces of #12 THHN at the tube  
socket, and a pot in the cathode circuit. 
 
A nice audio filter of some type also helps a lot. The various "Range" filters  
provide a pitch that is much too high (1020 Hz) for me, though. I use either  
the old CWF-2 filter, or the modern equivalent by Vectronics. Those are set  
to about 750 Hz. 
 
The selectivity of the 40 meter receiver is much too broad (purposely) and  
really can't be much improved on, although it is certainly fun to use. 
 
Using one or more of David's converters with a BC-453 or R-23/ARC-5 will  
work very well indeed, with plenty of adequate selectivity. 
 
BTW, Tim, I also own and operate an AN/GRC-109. I am extremely  
interested in your various home-brew inverter power supplies for both the  
ARC-5 and the '109. 
 
Are you going to be able to finish those any time in the near future? 
 
You have an excellent website, by the way. 
 
vy 73, 
 
Ken W7EKB 
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