[Milsurplus] Multiple Front End receiver

Fri Aug 27 10:14:57 EDT 2010

???. Yes. So what.

The suggestiuon was to use a telemetry receiver as a block down converter.
To do that the full frequency range of interest has to fit through the IF.
The OP requested a frequency range of far more than the IF BW of any
telemetry reciever I'm aware of.

AFAIK, there are no VHF or UHF receivers with IF BWs of tens of MHz with
the possible exception of some pulse optimized RADAR receivers.

-John

=============

> John,
>
> True, but there are MIL Receivers with inputs > 9 Mcs.
>
> 73
>
> Tom
> WB3AKD
>
> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "Tom Dawson" <wb3akd at earthlink.net>
> Cc: "Kludge" <wh7hg.hi at gmail.com>; <milsurplus at mailman.qth.net>
> Sent: Friday, August 27, 2010 1:26 PM
> Subject: Re: [Milsurplus] Multiple Front End receiver
>
>
>>I am not aware of any Nems-Clarke / DEI / Vitro / ACL / W-J telemetry
>> receivers with IF BW > 10 MHz.
>>
>> -John
>>
>> =============
>>
>>
>>>
>>> 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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>>
>>
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