[ARC5] Single-Chip NBFM Detector?

[arc5 at ix.netcom.com]

My thanks to the many of you who've replied to this.
I'm working on building an SCR-274N VHF set.
This would be far more scarce than the common
and later AN/ARC-5 VHF set, 
and does not require an external modulator.  
The receiver is, of course, AM, with a 6.9 MC IF.
I want to be able to operate this set in a hamfest
display, and doing so on AM is pointless.
I'll generate far more interest in our field
if the newbies can actually talk to the set 
with their whiz-bangie little hand-helds.
I know I could slope-detect, but I don't 
find that satisfactory and besides- 
doing it right shouldn't be that hard. 

There is almost always a way to get a set to function
as you desire without doing damage.  "Borg Implants"
is one way.   That's how I got a "W.A.S.P." set, 
LF receiver and HF transmit, to transceive on 3890 KC.
I "implanted" a simple converter in front of the receiver and
incorporated PTT switching on the tiny board. Worked fine
and no need to butcher anything.
I'm going to lift the AM audio off the grid of the audio PA, 
leave the rest of the circuit intact so the AVC and squelch 
still work, tap-off the 6.9 MC IF for detection,
 then feed that audio to the grid of the PA 
(or maybe to a first audio stage- I don't have the diagram
in front of me right now, so I don't remember, 
but you get the idea).  
There isn't much room in there, so the "implant" needs 
to be small and simple.  Older FM ICs wouldn't work well,
because they require so many external parts and 
fiddling on the breadboard to get them to work.
Besides; it's harder for me to screw-up "simple." ;-)

Thanks again,
73 Dave S.