[Milsurplus] Multiple Front End receiver

Fri Aug 27 05:24:42 EDT 2010

Mike,

ARC TV-10 /CV whatever it is:  beyond being less than optimal as far as 
sensitivity, it does not cover the whole band.

I checked local craigslist for the PRO-200(4,5,6) series and there is one 
for only $50.00 so they would seem to fall within your budget.

The kayak ride from the mainland would might stretch delivery times, though. 
I know that the 2005 and 2006 will definitely cover 225 to 400 MHz band. 
Also the old Regency MX-5000 covers both V/U ac bands.  The Regency should 
be even cheaper since it tops out at 512 MHz.

(MIL Radio Content follows)
A technically feasible but, perhaps,  less practical approach to the UHF 
problem might be to use an old Nems-Clarke telemetry receiver that covers a 
portion of the UHF band and feed the IF output to a batch of MIL Short Wave 
receivers.  Send pictures (prior to building collapse) if you choose this 
approach.

73

Tom
WB3AKD

----- Original Message ----- 
From: "Kludge" <wh7hg.hi at gmail.com>
To: <milsurplus at mailman.qth.net>
Sent: Thursday, August 26, 2010 7:39 PM
Subject: Re: [Milsurplus] Multiple Front End receiver

-----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!

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