Mark

Besides the 3 hobby radio forums there’s also the 2 on Facebook.
I don’t think the Admin. of the ALPB is acting as dictator as he’s asking for member input on a name and even the separating of the forum and the ALPB. In fact the new name is the result of input from the few members including myself.

I think only 3 people, myself included, bothered…[Read more]

You have more statutory holidays than Canada does and even a 4 day weekend at Thanksgiving but I think European countries have as many or even more.

Ya, those BV900s were made for gyms where you worked out with headphones and the transmitted music…..guess where it wasn’t a TV set large screen and an FM frequency for sound.

Don’t know if I would want to have 900MHZ headphones on all the time to hear my station.

A simple frequency counter will tell you the transmit frequency if it’s sensitive enough.

Right now at 12:45 Feb 18/19

“What’s Your Name, What’s Your Number” by Andrea True Connection.

And in case some don’t know the song I have been posting the songs here for any interested……https://youtu.be/3D8-NIFo-vY

The state of emergency…..the US is being invaded by aliens!

I think the good thing about the ALPB is the forum as Artisan has informed is staying with a new name, even though there will be no ALPB or if there is it will be a separate from the forum. Micro Broadcasters is a good name and accurate of unlicensed broadcasting.

@ thelegacy….If you got another visit it wasn’t necessarily because someone reported you for something it was because you are on their radar as you were visited once. So follow up checks may happen. Be good with them and they will be good with you.

You are too quick to assume someone is a “narc” and that’s why you got a visit.

Also they didn’t…[Read more]

I thought it was just changing it’s name to and was interested in feedback about new names.

I and a few others gave some suggestions but nothing was mentioned about shutting down. I wouldn’t like to see it close as it would be missed.

Thanks guys for explaining it!

“So, for example, if the d-c input power to an r-f amplifier stage is 100 mW, the r-f input power to it is 2.5 mW, and its r-f output power is 50 mW, then the amplifier has a power gain of 50/2.5 = 20 (13 decibels), and its operating efficiency is 50%.”

That is a big help, thanks.

Now I’m getting it!

But consider the question in my above post. The rule doesn’t say anything about actual usable output at what matters…. the 10 ft. antenna.

It seems a little clearer to me now. Thanks Tim.

Would be simpler if the rule referred to actual power out at the input to the 10 ft. antenna, realistic to what actually gets fed to the antenna.

How did they come up with input unmodulated to the final anyway?

Also what if you got a very high power amp as the final and even with the loss had a…[Read more]

Tim’s explanation was a good attempt at me understanding it. But to follow up. Why isn’t it like this with FM transmitters?

And since you have 100mW at the input, the 100mW being a product of voltage and current, what if you took the antenna from before the INPUT?

WAIT!…..I may have an answer for this(may or not be right). The key word is…[Read more]

I read the article and the different types of amplifiers but amplifier still means what goes out is a larger replica of what went in. A basic one transistor amplifier is basically that. The signal out is larger than the signal in.

With an FM transmitter the final amp brings up the power to the desired wattage out at the antenna which is the load…[Read more]

You all know what I have to say about rap so no need to get into it in this thread.

Any one who missed my thoughts can go back in my posts which aren’t that far back.

I have never understood why, if a final RF amplifier is just that … an amplifier, how you have less at it’s output than it’s input?

signed…

confused

Here’s another which may be of interest…..

https://www.ebay.ca/itm/700-1300-KHZ-TUNABLE-LOW-POWER-AM-RADIO-TRANSMITTER-FOR-YOUR-VINTAGE-RADIOS/333034764637

Got some info on this and seems better than the other and affordable!

Will work about 4 weeks at 4 hours a day on a 9V battery and will go 50 meters with a simple wire antenna.

May get…[Read more]

I asked for some detail and the longer the antenna wire you use the better.

Will go farther than part 15 FM will with 10 ft wire.

With a energizer 9 volt battery you get a day run time or you can make a battery holder with 6 Ds and maybe get weeks run time. With adaptor you should get some ground with it.

Looks good and simple.

Stable enough…[Read more]

Carl, First of all what you are having happen with the Panasonic radio with AFC is NORMAL functioning of AFC that’s doing what it should, at the expense of close much weaker signals beside. Better radios/tuners have it switchable just for this reason. The AFC basically, without getting technical broadens the bandwidth of a station so to speak and…[Read more]