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Author Topic: 2.5Ghz 30yr old TV antenna/downconverter - what can I do with it?  (Read 1491 times)
K0IZ
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« on: July 23, 2012, 05:48:12 AM »

In my basement I came across a 2.5Ghz downconverter setup I built from a kit.  This was about 1982 or so.  System included home-made rod antenna (with a bunch of washers as directors), and downcoverter.  Later made a 4ft dish (in attic) and coffee can horn.  At the time I pointed at a tower about 15 miles away that had a (if I recall correctly) "multiple distribution" system.  This carried HBO.  Long before the small satellites.  Service was sold to hotels, etc.  So I got free HBO reception.

Anyway, these days 2.5 Ghz has ham, routers, wifi, etc.  So now I am wondering if this setup can be used for anything (for the fun of it)?   
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K2DC
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« Reply #1 on: July 24, 2012, 02:22:50 AM »

I haven't looked into it in many years, but there are ham satellites with downlink frequencies around 2340 MHz.  Be advised though, the downconverter may have a filter to block that portion of the band.  I played around with a similar downconverter about 10 years ago that had a blocking filter.  Since it was a microstrip circuit, I was able to load it with a piece of high-dielectric material and move the filter stopband up and out of the way.  But yours may be worth playing with.

73,

Don, K2DC
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K0IZ
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« Reply #2 on: July 24, 2012, 06:02:20 PM »

I found an old advertisement re my downconverter.  Consists of a preamp (deluxe model!) and downconverter for (reportedly) 1.9 to 2.5Ghz.  Tunable by a pot.  Probably output on channel 3, but ad didn't specify.
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K2DC
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« Reply #3 on: July 25, 2012, 02:29:13 AM »

Mine had an output around 110 MHz.

73,

Don, K2DC
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W9GB
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Posts: 2597




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« Reply #4 on: July 26, 2012, 02:55:29 PM »

John -

Likely an MMDS service that existed in 1980s.  The FCC authorized the Broadband Personal Commncations System (PCS) for cellular expansion in 1993.
http://www.fcc.gov/encyclopedia/broadband-personal-communications-service-pcs

FCC auctioned the ~ 1.8 to 2.0 GHz spectrum in late 1984/early 1995.
Fixed microwave links in that band had to be moved, and many MMDS shutdown by that time.

Sprint Spectrum/Sprint PCS won the bidding for 95% of US market (A or B blocks)
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K6AER
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« Reply #5 on: July 26, 2012, 03:56:30 PM »

This band is now the 4G Sprint network. Use it as a fishing weight.
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W9GB
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« Reply #6 on: July 26, 2012, 05:33:31 PM »

The models that cover 2.3 to 2.5 GHz (~ S-band) allocation were widely modified 15 years ago for AMSAT AO-40 usage (RCVR) down converted to 2 meters.  Drake and California Microwave were 2 brand names.

w9gb
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KG4NEL
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« Reply #7 on: July 26, 2012, 06:08:20 PM »

I had a 3' dish in my basement for probably 5 years after AO-40 exploded Sad

Would be cool to have another target for S-band again, especially one that doesn't require accurate Az/El tracking.
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