Discussing technical issues as we are doing here is not meant to advise against using multiple transmitters rather to give some guidance for possible causes in case things do not operate as expected.
As Carl explained, the output networks and couplers used with each transmitter work in favor of isolating one output from another. Having each…[Read more]
A few comments about this:
“This would put the 2 systems 180-degrees out-of-phase with each other, a decent amount of isolation so we estimate.”
This is true for the 60 Hz power line voltage and current but can not be true for RF signals of different frequencies so no isolation due to this is expected.
The technique used to isolate two…[Read more]
At the bottom of the page you use to post you will find a section titled “Attachments”. Under this is a Browse button which will let you select the picture file(s) you want to upload and post. To add more files click on “Add another file” and keep going.
Be aware that there is a size limit to the files you upload. I don’t reme…[Read more]
Artisan, that would be my best guess. The bushes are close enough to the radiator to increase the capacitance to ground, hence the inductive phase difference between antenna voltage and current.
I’ll try to repeat this measurement when the leaves are gone.
Since I first posted I had a chance to do a test/listen drive and the range is about…[Read more]
As shown in the photos below, the radio8z transmitter and antenna are located in the back yard near bushes. The loading coil is tuned by moving a small series coil closer or farther from the main coil. The best performance at resonance historically results in a total power into the antenna of 85 mW.
With generous rain this spring and summer t…[Read more]
If you check the schematic for the ATU-30 you will see connections for the power ground and fused connections for the power lines. These are for carrier current connections.
Check the link below for a description of how this can be used.
I like your approach to this situation, simple and most likely reliable.
Software solutions can be useful but they also can be a pain to implement. Your solution of using hardware makes sense. I have had problems getting the two audio cards in my system to play nice with each other and the OS so I am designing a simple patch panel b…[Read more]
My installation is ground mounted over radials and to give some idea of how I did this I have attached two pictures. The radials are #12 insulated solid wire and there are a total of 12 each being 10 feet long. They are soldered together at the base of the antenna and are connected to a two foot long stake driven in the ground.
I used wire I h…[Read more]
That would be funny if you had planned it to work that way. Using multiple sound cards at my installation has, at times, been challenging. This works under Win XP but not Win 7.
I researched using multiple audio outputs under Win 7 and found a post by a Microsoft support person who said that multiple audio outputs do not work “by design” and am…[Read more]