In the process of rehabbing a dish and building a feedhorn for the
space segment at 5.8 GHz. Choosing a radio and a conversion scheme
that is both economical in the short term and with the ability to
reuse the radio at a later date has been an interesting journey.
The radio that I've found is the ADF 7020 development board. There are
several flavors of daughter cards for different licensed or ISM bands.
The particular flavor I'm considering using is the licensed band
(ham!) uhf radios (432).
Rather than reprint the data sheet, feel free to make google your
friend! Short synopsis is that it natively supports what looks like
more than a few common modes of demodulation for the type of data as
well as data rates compatible with satellite data downlinks.
Additionally, there is the capability to slew the frequency via
electronic frequency control OR via data in. Smells like an
application of an arduino playing DTE for an RS 232 connection. The
arduino can be driven by data from the dde interface from either
Orbitron or Satpc32!
Frequency conversion scheme will use a mixer and yig with a
synthesizer. This sounds like a difficult approach. Most of the heavy
lifting has been done by John Miles ke5fx. Driving the yig is quite
straight forward using either a parallel port or Arduino or such.
Mixer is a Hittite microwave dev board bought for 16 bux shipped on
epay. This is flat out the tiniest thing I've ever worked on. Pictures
to come!! Watch my flickr page.
The mixer should support both the data radio and a funcube dongle via
a mini circuits power divider.
The key is most of this gear is capable of being repurpoused to
Alexander, Graham and Bell when they're deployed.
Sorry as I've left out more than I've included, I'm afraid.
73 de Norm n3ykf
Check out RF Micro Devices DKFC5072A development board. This is a mixer and synthesizer that is programmable via a USB cable. It's rated up to 6 GHz and could form the basis of a universal transverter, just add appropriate filters and amps. I have used the older version up to 2.5 GHz and they work pretty good. The development board is $210.00.
- Howie AB2S
I used my Down East Microwave 5.760 transverter. This is the system I
use terrestrially. It uses a 2M (144 MHz) IF. The antenna is a 2 ft dish
with Directive Systems feed.
What I did was simply hook my Funcube Dongle to the IF port of the
transverter and set it for 224 MHz (5.84 - 5.76 = .08 MHz -- so 144 + 80
I did test the system at 5.84 GHz with a signal source and saw the
output was down about 15 dB from 5.76 GHz, but I figured "close enough"
for a try.
It worked! I just received my FITSAT-1 NIWAKA SWL card for 5.84 GHz in
I have not tried to decode data. That is a whole other game. They are
transmitting at 115k2 baud.
I have added a preamp to my system and tests show it makes up for most
of the losses I incur going up in frequency. So I'm hoping to try
The attempt will have to be set up with the FITSAT command team as the
5.84 G downlink is only turned on when the satellite is in a particular
orientation based on the position of the receiving ground station. It is
on for just 2 minutes.
Also, be aware that the doppler can be pretty severe - it was over 100
kHz during the pass I heard.
"A closed mouth gathers no feet"
On Wed, 19 Dec 2012 14:23:32 -0600, James Luhn wrote:
> I am looking for some information on how to receive 5.8GHz. What
> devices are used to receive this frequency? I have the capability to
> receive up to 2.4GHz but I am not sure what is available to receive
> data on 5.8GHz.
> As always, thanks a million for everyone's support.
An animated video showing the GO's dream of launching small payloads (max 30kg) into a max 450 km orbit by using what looks like a small aircraft launched missile.
73 Trevor M5AKA
Spaceflightnow.com says they will have live streaming coverage of the
Ariane 5 launch of
Skynet 5D and Mexsat Bicentenario communications satellites. The web
page reports the weather outlook seems promising for an on-time launch
at 2149 GMT (4:49 p.m. EST). The launch window extends for 79 minutes
to 2308 GMT (6:08 p.m. EST).
Right now its text updates; the web page says they will begin
streaming video closer to launch time:
73 de JoAnne K9JKM