“Now only a few of us log in to post about low power radio, only to face scolding if what we write doesn’t match that of a 12-year old starter.”
Maybe comments and misinformation such as this is a factor.
Kangaroo court? Yep, it appears that I am on trial for posting an opinion that part of a post seemed silly. I was trying to understand the original post prior to being suspected of having an “issue”, a comment which I also sought to understand.
Carl lastly posted “What our serious colleague judged as “silly” wasn’t originally meant to be sill…[Read more]
Responding to comments in quotes:
Why post it?
“Whether I was “silly” or not is not the main issue… it is your apparent disregard for what you deem “silly”.”
I don’t even know what you mean by this. Obviously, I read it and am responding to it…hardly a disregard. This is the “main issue”? What “issue”? Are you trying to make one?…[Read more]
The EDM should be OK as long as you limit its range. It is sometimes confusing about “compliant” vs. “certified”. Compliant generally means the unit meets the FCC technical specifications of 15.239 as claimed by the manufacturer or seller, where certified means it has been tested to do so by a FCC acceptable laboratory. Neither is a gu…[Read more]
You are welcome to join the forum and post as you wish.
Regarding the license free use of a transmitter on the FM broadcast band, such operation in the US is governed by Part 15. 239 of the FCC rules. There is no power restriction but there is a field strength restriction which effectively limits your expected range to about 200…[Read more]
We received a query from a visitor and it is copied here. Let’s see if we can help him with this:
The guys over at BMI gave me your information. I am trying to create a Low power FM station for my Christmas display. I sync lights up to music and like to have Christmas music playing 24/7 for the neighbors and myself, so I can tune it…[Read more]
About a fortnight ago we hosted a get-together for our neighborhood residents and attending was my neighbor from one door diagonally across the street. During general chat with him he mentioned, and I paraphrase, “You know I am a lawyer but I want to ask you something…I don’t care if it is not legal and will not report you but I am cu…[Read more]
Under some particular circumstances, one way transmission by hams is permitted. I used to do so in the ’70s on behalf of our ham organization by “broadcasting” recorded programming made available from a ham related national news group.
I don’t recall the specific rules which apply so do some homework if you are interested and please refrain…[Read more]
radio8z replied to the topic So hows this cut & paste explaining what Low Power broadcasting is? in the forum Regulations / Law 1 month, 3 weeks ago
Regarding explaining license free broadcasting to the public, Jon Paul Janze authored and I edited a short blurb about this. Click on “About Us” at the top of this page and scroll down to view this. We tried to avoid specific details about rules and technology with the thought that the explanation might encourage someone with no knowledge of t…[Read more]
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]
- Load More