This is just an idea. Maybe I will try it
sometime.
Say, for instance, that you have an AM
Part 15 station that just does talk programming,
This is just an idea. Maybe I will try it
sometime.
Say, for instance, that you have an AM
Part 15 station that just does talk programming,
or old radio shows, or really old jazz - in other
words, a station that does not need a great
amount of fidelity in the audio chain.
Then say you have a fairly good coverage area with
your Part 15 AM transmitter, at least around your
neighborhood, maybe more.
(This is all hypothetical.) Go out and get a good
AM broadcast band receiver. I am thinking of a
specific kind though. The AM broadcast DX community
has really been having fun with receivers called
"ultralights." Some of these are very inexpensive
and work real well. I think Sony makes one for about
$20.00 that has excellent sensitivity and selectivity.
(I'll have to look up this stuff on Google.) These radios
are good, inexpensive, and SMALL.
Get a cheap FM transmitter that is certified. Hook the
AM receiver to the FM transmitter. The FM transmitter will
be able to repeat your AM signal on the FM band.
(As mentioned above, talk programming or really old
music would be best for this, because the fidelity will
depend on the AM part of the system.)
Now here's where it gets interesting. How to power
the thing. Get one of those solar power night lights
that you put in your yard. Take the lights out and
use it to power the FM transmitter and AM receiver.
(This is just the beginnings of this idea.) Obviously
the system would only work at night. So anybody
listening to you on FM could only tune in at night.
But this would just be an experiment anyway. Also,
some interesting engineering work would almost certainly
be involved.
If you have a good friend in your neighborhood that
wants to listen to your station and REALLY UNDERSTANDS
what this is all about, take the completed package and
put it in that person's yard near their house in a place
that gets the most sunlight. Also, in some place where it
won't be a hazard or whatever. I think your listener friend
would have to be a really good friend who really is interested
in hearing your programming and knows not to step on
your repeater, or knows how to persuade the family dog not
to eat your repeater, or whatever.
The reason I thought of this is because I have some good
friends down
the street that really want to hear my station. However,
the receiver in their entertainment center is only good on FM,
the AM is terrible. They are close friends, and putting a solar
powered repeater in their yard would be no problem. The FM
transmitter only has to go 50 feet or so if it is in their yard.
And once in place, the repeater could just stay there unattended.
Obviously this idea has a lot of problems. It probably wouldn't
work in a place like Seattle, WA, where it rains a lot.
Also, most people probably wouldn't want a "mysterious electronic
device" in their yard.
Also, if this is to work just at night, if your AM signal is being
clobbered by skip, that wouldn't work either. You could use
another Part 15 frequency for a link, like 49 MHz. I don't
think there are too many baby monitors on that band now,
are there? Aren't most of those monitors up on 900 MHz
or higher now? (I really don't know.)
So there is the idea. Maybe someday somebody will try it.
Maybe someday I will try it.
I just threw this out for the fun of it, anyway.
Best wishes,
Bruce, MICRO1690/1700
P.S. I typed this really fast, and my eyesight is
not good. I have to go and don't have time to
edit this. I hope their aren't to many typos.
MICRO1700
Because so much of what you described is already etched out in very clear terms with specific people who may be willing to help, I strongly encourage you to go forward with the idea.
It is exactly these kind of linking and co-operative ventures that open a way for Part 15 to expand into a larger service.
One relay link at a time.
Hi Carl!
It's always great to hear from you!
Well, I have a suitable transmitter and
receiver. It's the solar power plant that
is the hard part (actually the FUN part.)
I am still working on the shortwave 13.560 MHz
Part 15 transmitter and restoring the Gates console.
However, maybe I'll research this for a while.
Sometimes those solar powered yard night lights
go on sale.
I'll keep you posted. By the way, do you think the
49 MHz band is pretty clear now? Do you know if
most baby monitors have moved to 900 MHz or
higher? I guess your answer really wouldn't matter
because what is happening on that band here in
this neighborhood is what is important. I might
check to see if those channels, 49.830, 49.845,
49.860, 49.875, and 49.890 MHz are in use.
However, if I find activity, I would not listen to
what is there. I'm not into that.
I am mentioning using 49 MHz to transmit out
to a remote FM transmitter only because my
AM transmitter is not on right now. The ground
system still needs to be redone.
Well, I'll do some research on the solar power
plant thing. And even though you
can't buy 49 MHz walkie talkies anymore, I
think I still have a few laying around this place
somewhere.
Best Wishes,
Bruce, MICRO1690/1700
Y'all are having too much fun!! 😉
Anyway, why restrict your friends to nighttime operation? Why not get one of those newer solar rechargeable power packs I've seen for around $20? Depending on power drain it should power it all day plus several hours after dark until sleep time.
Another solution, if your friend's AM receiver has an external antenna terminal, would be to build a loop antenna. This is what I'm going to do ... a nice one with varnished wood and copper wire winds and a built-in air cap. The intent is to make it look like a polished diamond-shaped tabletop decoration. I figure I'll sell them basically at cost plus a 'gratuity' for my labor.
Please to be enjoying a previous discussion on loop antennas, a very good idea!
A twenty dollar solar power pack? Yikes!
How cool is that?
Best Wishes
Bruce, MICRO1690/1700
run it over a 900 mhz dsss link. either audio over ip or digital audio/video. use audio for program and video for the carrier sync signal.
900mhz is good for nlos applications and offers up to 4 watts erp in ptmp and 200 watts erp in ptp modes.
Thank you KC8GPD!
More stuff to learn about!
That's good.
Best Wishes,
Bruce, MICRO1690/1700
Here's one that sports (purportedly) 3500mah (watch linewraps):
http://www.simenibiz.com/iphone-battery-accessory/828-3500mah-solar-charger-compatible-the-most-digital-device.html
BTW, I have one of those little Sansa Clips which is recharged by USB power. The Sansa Clip is very tiny, has a voice recorder (.wav) I use a lot for recording Beth's (from our library) READ ALOUD stories for adults, which I air on the station (after editing and running through effects to make it sound better). Plus it has a built-in FM receiver (which you can also record). I use its regular 1/8" headset/line-out with a little FM transmitter when driving the taxi to play MP3 or .wav files D/L'd from my iMac.
If the solar charger works as advertised, it should be able to keep it going indefinitely.
