[Milsurplus] Multiple Front End receiver

[Kludge]

-----Original Message-----
From: Tom Dawson [mailto:wb3akd at earthlink.net] 
> Sounds like you want to listen to multiple channels simultaneously so the 
> single IF idea won't work as there is more chance of you successfully 
> performing brain surgery than all those planes being within 20 Hz or so of

> the channel frequency (assuming your multiple LOs were sufficiently 
> accurate) so it would definitely be heterodyne city.

Yeah, so I've heard.  :-)

Bill, KU8H, allowed as how a single LO with multiple IF et al chains all
tied to a single audio stage could be a better approach.   Where a problem
comes in with this is in the frequency spread.  The frequencies of interest
(as requested by someone else) are as follows (all in MCs):

HNL approach/departure  118.3  269.0
HNL clearance delivery  121.4  281.4
HJR tower  132.6  340.2
HJR ground  123.8  336.4
HJR clearance delivery  121.7  380.5

I know there are five pairs rather than four.  I don't know if I'll be able
to hear HNL's clearance delivery although I may be able to hear the read
back.  I know I'll hear read back to HJR's clearance delivery and should
hear both sides dependent on the transmitter antenna site.  (That may also
come out of HNL.)  

If I choose a LO frequency wisely for each [sub-]band (or get lucky with the
crystals I have on hand which is more likely), I should be able to use HF
coil sets for the IF transformers also several different frequencies will be
needed to achieve that.  

> Something like the ARC Receivers for VHF then another batch of ARC
Receivers 
> stack with a TV-10 converter or something similar for UHF.  

Using R-13s and/or R-34s has the advantage that I can rack them in slightly
altered 2 or 3 Rx command set racks (Pre-hacked ones would be good for
this.) then tune them as needed.  Once tuned, they can be disconnected from
a normal control head and routed to a fairly conventional aircraft audio
panel for mixing et al.  

> A Stack of PRO-2005/PRO-2006 scanners would fit the bill with no converter
, if you can 
> find some to fit your budget.  

Will these cover the UHF aircraft band as well?  With the amount of local
and "just passing through" military traffic, that is almost a necessity.
(Because of that traffic, I might add Kaneohe MCAS (HNG) approach/departure
at 125.0 & 263.5 MCs even though it's on the other end of the island.)  If
they do, I may do a split - A.R.C. for VHF and scanners for UHF. - if I can
find the space. 

> (Non-sequitur: Let Google maps find directions between Honolulu and my
QTH.
> Directions included "Kayak across the pacific ocean-2756 Miles to WA.")

So *that* is how UPS & FedEx get ground shipments here.  :-D

> If you go the Shelf full of ARC receivers route, be sure to post a
picture.  

What about Collins 51X-2Bs (R-1123/ARC-73s) or even 618M-1s for the VHF
side?  Since I don't have to get finer than .1 MCs, I can use either one.
(Before I get cards & letters, I know the AN/ARC-73 is good to .05 MCs.)
They're a heck of a lot more expensive than scanners or A.R.C. equipment but
they'd be sooo cool looking, especially if I can find racks to fit them.
:-)

Seriously, I'll see what I can do.  :-)

Best regards,
 
Michael, WH7HG BL01xh
http://www.nationalmssociety.org/chapters/NTH/index.aspx 
http://wh7hg.blogspot.com/ 
http://kludges-other-blog.blogspot.com 
Hiki Nô!