PE1CKK Transponder JO22OF

DB8TF Flo I also observe this for some hours. it looks like there is a DATV signal uplink on 2400.240 why ever

now it is gone

The increased noise floor is an experimental linear transponder (with AGC) in my home town. 144.213 - 144.228 MHz in (15 kHz wide, 10.7 MHz crystal filter) and (around) 2400.227 - 2400.242 MHz out. Nothing more, nothing less ...

It is not my transponder, so I don't have plans.

It leads e.g. to very easy mobile operation through QO-100 ; -)

Hello all

In my never-ending hunger for experiments, I made an experimental linear transponder from 144MHz to 2400MHz.

When I am at home the transponder is active and 2m stations in the vicinity of JO22OF can work over QO100.

Bandwidth of the transponder is 15KHz, theoretically 3 stations can work simultaneously.

Enjoy!

pe1ckk Thanks for your announcement..

I'm interested in how you did it.

Hi, I think that permission must be asked if valid to do translation from ground stations ..... it can be interesting to enter interested ground stations, but I think if it's very convenient not to build a simple UP-CONVERTER, it's a valid excuse.

Putting on a transponder is as easy as making an uphill converter for satellite, there are many solutions to instigate building your own Uplink station on the satellite.

This is my impression, but it is better to ask for confirmation from the dear DB2OS.

73 de_________Maurizio Boschetto__________IW9EZO

This is the diagram of my local transponder. 10,7 MHz filters are 15kHz wide. (FM filters)

Still there now although somewhat reduced, there is still a small carrier at 10,489,738.850. There was some large humps in the noise floor a few hours ago.

Not sure if caused by the OP's transponder or not. It may be an interesting concept, but doing so over the satellite is not something I would have thought should be tried out on air. I thought requests had to be submitted to run repeaters and this is basically what it is? There is potential for interference to users on the satellite from others signals in the OP's vicinity. I wonder what the people at Goonhilly, Amsat and Qatar think about it?

That would be illegal in the UK.
Also, most transponders retransmit noise at about -10dB relative to peak output when not being used.

Nice experiment though.

David

Indeed, it's the experiment that counts.

My experience with people who are stating something is illegal (or not allowed in their perception), is that these people are not (cap)able of carrying out these experiments themselves.

Experiments facilitate progress, shouting at progress is identical to whistling at the referee with biscuits in your mouth ; -)

Quote: PA3YFM "whistling at the referee with biscuits in your mouth ; -) "

Wonderful !

It's noise ... not 'QRM'. Noise.