I've seen a bunch of cases where a 10Ghz gunn
diode was used for full duplex, with a split IF.

Has any one seen a similar scheme work at lower frequencies?

I want to create a small and light weight full duplex data radio.
This is for my RC powered solar plane.

So one end of the link will be airborne and the other end will be fixed.

I'd like to aceive:
20 to 40 miles LOS range.
9600 baud data throughput.
1W TX power. (To comply with FCC Ameateur RC control rules.)
1W total airborne power. (To minimize power loading)
Very light weight.

Tracking gain antenna is ok on the ground side.
Airborne antenna needs to be omni.


Any ideas or thoughts?


Paul (KL7JG)

How big is the plane that you can see it from 20-40 miles? Is it the
Spruce Goose or what? Are you trying to make an RPV for the military?
Why do you need full duplex? Are you just trying to collect data from
the airplane? I'd have to double check, but I don't believe it's legal
to "control" the plane on 10 GHz.

Scott


wrote:

I've seen a bunch of cases where a 10Ghz gunn
diode was used for full duplex, with a split IF.

Has any one seen a similar scheme work at lower frequencies?

I want to create a small and light weight full duplex data radio.
This is for my RC powered solar plane.

So one end of the link will be airborne and the other end will be fixed.

I'd like to aceive:
20 to 40 miles LOS range.
9600 baud data throughput.
1W TX power. (To comply with FCC Ameateur RC control rules.)
1W total airborne power. (To minimize power loading)
Very light weight.

Tracking gain antenna is ok on the ground side.
Airborne antenna needs to be omni.


Any ideas or thoughts?


Paul (KL7JG)

How big is the plane that you can see it from 20-40 miles? Is it the
Spruce Goose or what? Are you trying to make an RPV for the military?
Why do you need full duplex? Are you just trying to collect data from
the airplane? I'd have to double check, but I don't believe it's legal
to "control" the plane on 10 GHz.

Scott


wrote:

I've seen a bunch of cases where a 10Ghz gunn
diode was used for full duplex, with a split IF.

Has any one seen a similar scheme work at lower frequencies?

I want to create a small and light weight full duplex data radio.
This is for my RC powered solar plane.

So one end of the link will be airborne and the other end will be fixed.

I'd like to aceive:
20 to 40 miles LOS range.
9600 baud data throughput.
1W TX power. (To comply with FCC Ameateur RC control rules.)
1W total airborne power. (To minimize power loading)
Very light weight.

Tracking gain antenna is ok on the ground side.
Airborne antenna needs to be omni.


Any ideas or thoughts?


Paul (KL7JG)

I want to do it on 6M.
I'm asking about a fullduplex link, "Like" is done with the 10Ghz Gunn.
I don't intend to use 10Ghz.

Fullduplex:
Control up link, and Telemetry downlink, GPS position, Altitude Airspeed etc....

I'm currently doing this with a 6M TX and a 900Mhz telemetry Tx, but it makes for two antennas,
two radios in the plane etc.... I would kill for 100gm less weight.


As for range, I'm trying to set some FAI records with the plane.
See:
http://records.fai.org/models/ Select the subclass:
Sub-class F5-SOL (Aeroplane, electric motor (solar cells))

The current Model Altitude record is about 7K ft.
I'd like to do 10K and with some wind it could easily get several miles down range.
Thus 20 miles to have some margin.

Last Years Plane (With less efficient cells.)
Launch: http://www.rasdoc.com/splinter/DCP01221.JPG
Proof it flies: http://www.rasdoc.com/splinter/ItFlies.JPG
Plane has 144 inch span and weighs about 2Kg or 4.4lbs.


Paul (Kl7JG)

I want to do it on 6M.
I'm asking about a fullduplex link, "Like" is done with the 10Ghz Gunn.
I don't intend to use 10Ghz.

Fullduplex:
Control up link, and Telemetry downlink, GPS position, Altitude Airspeed etc....

I'm currently doing this with a 6M TX and a 900Mhz telemetry Tx, but it makes for two antennas,
two radios in the plane etc.... I would kill for 100gm less weight.


As for range, I'm trying to set some FAI records with the plane.
See:
http://records.fai.org/models/ Select the subclass:
Sub-class F5-SOL (Aeroplane, electric motor (solar cells))

The current Model Altitude record is about 7K ft.
I'd like to do 10K and with some wind it could easily get several miles down range.
Thus 20 miles to have some margin.

Last Years Plane (With less efficient cells.)
Launch: http://www.rasdoc.com/splinter/DCP01221.JPG
Proof it flies: http://www.rasdoc.com/splinter/ItFlies.JPG
Plane has 144 inch span and weighs about 2Kg or 4.4lbs.


Paul (Kl7JG)

OK, I see what you're up to. SHF Microwave has gunnplexers, etc. The
website is at http://www.shfmicro.com/ I believe you will need two
gunnplexer modules and two I.F. receivers of some sort to run full
duplex. Most people running WBFM on 10 GHz use an I.F. of either 30 MHz
(to be used with an HF rig) or 100 MHz (to use a standard AM/FM radio as
the I/F. rig. That's the way I ran mine back in the 90's). Hope this
gives you a starting point...

Scott
N0EDV

wrote:
I want to do it on 6M.
I'm asking about a fullduplex link, "Like" is done with the 10Ghz Gunn.
I don't intend to use 10Ghz.

Fullduplex:
Control up link, and Telemetry downlink, GPS position, Altitude Airspeed etc....

I'm currently doing this with a 6M TX and a 900Mhz telemetry Tx, but it makes for two antennas,
two radios in the plane etc.... I would kill for 100gm less weight.


As for range, I'm trying to set some FAI records with the plane.
See:
http://records.fai.org/models/ Select the subclass:
Sub-class F5-SOL (Aeroplane, electric motor (solar cells))

The current Model Altitude record is about 7K ft.
I'd like to do 10K and with some wind it could easily get several miles down range.
Thus 20 miles to have some margin.

Last Years Plane (With less efficient cells.)
Launch: http://www.rasdoc.com/splinter/DCP01221.JPG
Proof it flies: http://www.rasdoc.com/splinter/ItFlies.JPG
Plane has 144 inch span and weighs about 2Kg or 4.4lbs.


Paul (Kl7JG)

OK, I see what you're up to. SHF Microwave has gunnplexers, etc. The
website is at http://www.shfmicro.com/ I believe you will need two
gunnplexer modules and two I.F. receivers of some sort to run full
duplex. Most people running WBFM on 10 GHz use an I.F. of either 30 MHz
(to be used with an HF rig) or 100 MHz (to use a standard AM/FM radio as
the I/F. rig. That's the way I ran mine back in the 90's). Hope this
gives you a starting point...

Scott
N0EDV

wrote:
I want to do it on 6M.
I'm asking about a fullduplex link, "Like" is done with the 10Ghz Gunn.
I don't intend to use 10Ghz.

Fullduplex:
Control up link, and Telemetry downlink, GPS position, Altitude Airspeed etc....

I'm currently doing this with a 6M TX and a 900Mhz telemetry Tx, but it makes for two antennas,
two radios in the plane etc.... I would kill for 100gm less weight.


As for range, I'm trying to set some FAI records with the plane.
See:
http://records.fai.org/models/ Select the subclass:
Sub-class F5-SOL (Aeroplane, electric motor (solar cells))

The current Model Altitude record is about 7K ft.
I'd like to do 10K and with some wind it could easily get several miles down range.
Thus 20 miles to have some margin.

Last Years Plane (With less efficient cells.)
Launch: http://www.rasdoc.com/splinter/DCP01221.JPG
Proof it flies: http://www.rasdoc.com/splinter/ItFlies.JPG
Plane has 144 inch span and weighs about 2Kg or 4.4lbs.


Paul (Kl7JG)