Total posts : 45366
The AM-88 unit would be a very good choice for those on a budget. I have also seen other fine designs across the web that would be good.
I am going to build a LW TX. It will use a PLL circuit with reference crystal controlling an oscillator, probably a Colpits design, followed by a two stage buffer. Then flow into a balanced modulator chip with selectable carrier or carrier null to facilitate AM and SSB. For the FM, there will be the typical direct FM configuration via the infamous varactor diode. When not operating in FM mode, the varactor circuit will simply be bypassed with a DIP package relay.
Probably operate on 25 volts DC and I am going to dedicate one of my LPB TCU-30 units modified for the LW band to be the antenna tuning unit outdoors in what I have called the “Puppy Hut 2” box. Puppy Hut 1 is the current stand-by MW 3 meter stick.
I had a thought on the distribution ideas. As to a dedicated full time streaming server, there would need to be someone who can feed that on a full time basis, and the server would need to be secured so that it is dedicated to the network for source of programs.
I believe it should not be public accessible on the web. After all, this whole effort is to create a LW network and not a string of web streams. The web can serve the LW network as the program sourcing as well as an ftp server.
For reliability, I highly recommend to not use any of those “freebie” stream services as those are shared servers and during heavy load times, which could be at ANY time, may and most likely will cause buffering and drop out issues to the network. This, as well as the ftp server, CANNOT be ran from someone’s home connection. It MUST be a co-located server on a data center and its high speed net connection! It must also take into account the natural delay time of the web.
I recommend a bit rate of no less than 128kps. This gives roughly about a 20 second delay. A 192kps will give about a 15 second delay. Anything lower than 128 will give too much delay.
There can also be “LW LIVE” where some or all of the affiliates partaking in a live program, can all get together with the use of “Team Speak”. This is a real time two way internet communications program that many gamers use for communications during a multi player game. I have used it for my station’s “Z-FILES” program, where 3 hosts are in 3 different locations across the US and Canada, and it performs as if all 3 hosts were in the same room on mics. It is bitrate settable so that voices or voice over audio/music bumpers will sound full fidelity.
All kinds of ways to do this. It is just the beginning!