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Using a Signal Generator for an "In Home" radio transmitter

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pfjw@aol.com
Guest

Tue Jan 08, 2019 3:45 pm   



On Monday, January 7, 2019 at 3:57:50 PM UTC-5, jurb...@gmail.com wrote:

> I know it is absolutely illegal to use any of the FM band, that this when they come and treat you like you're running a meth lab. However there is so much noise on AM that they might never even suspect. You might be better running the "transmitting antenna" through wires to the desired locations. I fit leaves the house, even on your own property that might mean trouble. And we are talking feds here, that means your miracle worker lawyer is no good.

No. There are multiple FM & FM stereo Part-15 compliant transmitters. Typically, they are around 25 MW or so, and with a good antenna mounted high enough will easily cover a few acres.

https://sourcefmtransmitter.com/wp-content/uploads/2017/07/ramsey-fm100b-large.jpg

I keep this one, and it gets its heaviest use at Kutztown twice per year, covering both pavilions, and then some. Matched to this antenna:

http://img0016.psstatic.com/152423604_amazoncom-tru-match-fm-broadcast-antenna-kit---25-watts-.jpg

There are (at least) half-a-dozen more options.

Eventually, I am would like to set up a small NTSC TV transmitter, as TVs are becoming a greater and greater presence at Kutztown. But, it is something I would never use at home.

Peter Wieck
Melrose Park, PA

pfjw@aol.com
Guest

Tue Jan 08, 2019 3:45 pm   



On Monday, January 7, 2019 at 4:13:43 PM UTC-5, Pat wrote:

Quote:
I'm not sure what you meant by "trim your antenna to the target
frequency". If you are talking about an antenna that is resonant at
AM broadcast band frequencies, that is not practical (or legal as you
correctly pointed out) for a home transmitter. One wavelength at 1600
kHz is 187 meters (over 600 feet).


http://www.sstran.com/pages/sstran_buildant.html

Go to the section on "tuning".

Peter Wieck
Melrose Park, PA

amdx
Guest

Tue Jan 08, 2019 4:45 pm   



On 1/7/2019 1:33 PM, tubeguy_at_myshop.com wrote:
Quote:
Is it possible to use a Signal Generator for an "In Home" radio
transmitter?

I would like to make a small in the house AM radio transmitter,

so I can
listen to my own music collection of MP3 music on my antique radios.


I do it the other way, I feed antique radio programs from my internet
radio into my FM transmitter, so I can listen on my portable radio.

Two of my favorite Old Time Radio Stations,

Quote:
http://www.20thcenturyradio.com/


> http://www.oldvalveradio.com/

Stoke up the fire and listen to,

Sherlock Holmes
Johnny Dollar
Philip Marlowe
Dragnet- Features Jack Webb and advertises Fatima cigarettes >
https://archive.org/details/Dragnet_OTR/Dragnet_49-06-17_ep003_The_Werewolf.mp3Hall
of Fantasy
The Bob Hope Show
Have Gun Will Travel
Escape
Bold Venture with Humprey Bogart and Lauren Bacall
Tarzan
The Whistler
Richard Diamond
The Lives of Harry Lime Orson Welles does the lead role
Broadway Is My Beat
Bob & Ray
Suspense
Box 13
Philo Vance
The Lone Ranger
Screen Director's Playhouse
The Six Shooter
Gunsmoke ‎William Conrad did the voice for Matt Dillion
Fort Laramie Raymond Burr does the lead role.
X Minus One

Mikek

Fox's Mercantile
Guest

Tue Jan 08, 2019 5:45 pm   



On 1/8/19 9:19 AM, amdx wrote:
> into my FM transmitter

And how is that supposed to work with a bunch of AM radios?

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

John-Del
Guest

Tue Jan 08, 2019 7:45 pm   



On Tuesday, January 8, 2019 at 11:09:38 AM UTC-5, Fox's Mercantile wrote:
Quote:
On 1/8/19 9:19 AM, amdx wrote:
into my FM transmitter

And how is that supposed to work with a bunch of AM radios?



You feed the headphone jack of the FM radio into an AM XMTR...

Sheesh Jeff!!

Chuck
Guest

Tue Jan 08, 2019 7:45 pm   



On Mon, 7 Jan 2019 12:57:48 -0800 (PST), jurb6006_at_gmail.com wrote:

Quote:
You're off by a factor of ten. You want up to 1,650 KHz. Actually it is so easy to build an oscillator like that and easy to amplitude modulate that might be a better option. Well unless you have nothing better to do with the generator.

Crystal controlled would be better because drift is not good. But then if you just leave it on all the time it will settle in and be stable enough.

Another thing is to keep the power down, you don't need problems with the FCC. They got a SWAT team, I shit you not. I am not sure what you can get away with, maybe 100mW or 500, something like that. A quick Google didn't yield a straight answer but I would say just make sure the signal doesn't leave the house.

I know it is absolutely illegal to use any of the FM band, that this when they come and treat you like you're running a meth lab. However there is so much noise on AM that they might never even suspect. You might be better running the "transmitting antenna" through wires to the desired locations. I fit leaves the house, even on your own property that might mean trouble. And we are talking feds here, that means your miracle worker lawyer is no good.

I used to live in a city with 50,000 residents in the southern U.S..
There was, and probably still is, a pirate station in the educational
FM band. It has been on the air for years and it doesn't interfere
with local FM signals. I have sinced moved to a town of 20,000 people
in southern MN. Someone started a pirate station playing Tejano music
24 hours a day. Unfortunately their frequency was at 90.3 MHz and the
signal bled over onto the local MPR signal at 90.1. I complained to
the FCC and within 3 weeks they shut the station down. So it appears
that the FCC is more aggressive when the station impinges on
legitimate signals.

Fox's Mercantile
Guest

Tue Jan 08, 2019 7:45 pm   



On 1/8/19 11:46 AM, John-Del wrote:
Quote:
On Tuesday, January 8, 2019 at 11:09:38 AM UTC-5, Fox's Mercantile wrote:
On 1/8/19 9:19 AM, amdx wrote:
into my FM transmitter

And how is that supposed to work with a bunch of AM radios?



You feed the headphone jack of the FM radio into an AM XMTR...

Sheesh Jeff!!



Heh, I keep seeing people totally oblivious to the requirement
of an AM transmitter for BCB AM radios.

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

Dave Platt
Guest

Tue Jan 08, 2019 8:37 pm   



In article <2jo93e5o60lea4jfiqg5vld5l3ooljg2ub_at_4ax.com>,
Chuck <ch_at_dejanews.net> wrote:

Quote:
. Someone started a pirate station playing Tejano music
24 hours a day. Unfortunately their frequency was at 90.3 MHz and the
signal bled over onto the local MPR signal at 90.1. I complained to
the FCC and within 3 weeks they shut the station down. So it appears
that the FCC is more aggressive when the station impinges on
legitimate signals.


"Harmful interference" vs. "unauthorized operation". Both can come
with big fines... but, yes, the FCC is somewhat more likely to react
when faced with a situation where a legitimate licensed broadcaster is
being interfered with. (Commercial licensees have paid $$ for their
licenses, and don't like losing market-share/coverage to pirate
transmitters).

amdx
Guest

Wed Jan 09, 2019 1:45 am   



On 1/8/2019 12:22 PM, Fox's Mercantile wrote:
Quote:
On 1/8/19 11:46 AM, John-Del wrote:
On Tuesday, January 8, 2019 at 11:09:38 AM UTC-5, Fox's Mercantile wrote:
On 1/8/19 9:19 AM, amdx wrote:
into my FM transmitter

And how is that supposed to work with a bunch of AM radios?



You feed the headphone jack of the FM radio into an AM XMTR...

Sheesh Jeff!!



Heh, I keep seeing people totally oblivious to the requirement
of an AM transmitter for BCB AM radios.


I was oblivious to your requirement, you made that clear. I just
wanted to let people know what I do, and to make them aware of the old
radio programs available over the internet. Listening to Dragnet as I
write, on an FM radio!

Mikek

btw, has anyone tried a class E amplifier as an AM transmitter?
Base/gate drive is transmit frequency, B+ is the audio.
I'll google it.

Fox's Mercantile
Guest

Wed Jan 09, 2019 2:45 am   



On 1/8/19 6:10 PM, amdx wrote:
Quote:
btw, has anyone tried a class E amplifier as an AM transmitter?
 Base/gate drive is transmit frequency, B+ is the audio.
I'll google it.


On of the "Impress kids" kit is an AM transmitter.
It's 1 MHz TTL crystal oscillator.
The Vcc is fed through an audio transformer.

Pretty slick, an AM transmitter with only 2 parts.


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

amdx
Guest

Wed Jan 09, 2019 4:45 am   



On 1/8/2019 6:49 PM, Fox's Mercantile wrote:
Quote:
On 1/8/19 6:10 PM, amdx wrote:
btw, has anyone tried a class E amplifier as an AM transmitter?
  Base/gate drive is transmit frequency, B+ is the audio.
I'll google it.

On of the "Impress kids" kit is an AM transmitter.
It's 1 MHz TTL crystal oscillator.
The Vcc is fed through an audio transformer.

Pretty slick, an AM transmitter with only 2 parts.



Ya, I found some, you do need some DC bias on the secondary of the
transformer.
See page 21, 2nd page from bottom.>
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=18&ved=2ahUKEwjeiPbN09_fAhVyg-AKHVAeDFEQFjARegQIABAC&url=https%3A%2F%2Fwww.crarc.ampr.org%2Fuploads%2FMain%2FArchives%2FJuly%2520Class-E%2520Transmitters.pdf&usg=AOvVaw2RezBtb1JfwKR236TgSS4v

Here's an AM transmitter with 3 parts.
> https://www.youtube.com/watch?v=YNGs-IX_B2s

Mikek


Guest

Wed Jan 09, 2019 5:45 am   



Jeff Liebermann wrote: "Try 1650 KHz instead. Kilocycles died 50 years ago."


Any tech worth their salt understands both. They
express the same value.

Fox's Mercantile
Guest

Wed Jan 09, 2019 5:45 am   



On 1/8/19 10:02 PM, thekmanrocks_at_gmail.com wrote:
Quote:
Jeff Liebermann wrote: "Try 1650 KHz instead. Kilocycles died 50 years ago."


Any tech worth their salt understands both. They
express the same value.


And only the humor impaired see the need to point that out.

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

Jeff Liebermann
Guest

Wed Jan 09, 2019 9:45 am   



On Tue, 8 Jan 2019 20:02:30 -0800 (PST), thekmanrocks_at_gmail.com wrote:

Quote:
Jeff Liebermann wrote: "Try 1650 KHz instead. Kilocycles died 50 years ago."
Any tech worth their salt understands both.


Bulk table salt sells for about $100 per metric ton. Methinks I'm
worth more than that.

>They express the same value.

Not the way they were originally written. Hz = cycles/second.
However, the original comment was "16,500 kc" which is just cycles. No
way to know if that's cycles/sec, cycles/minute, cycles/fortnight, or
just counting waveform cycles. If he had written "cps", which means
cycles/second, I might agree, but not kc.



--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Mike Coon
Guest

Wed Jan 09, 2019 4:45 pm   



In article <jn9b3e5cmq5tfl8n1ou31nk9u9gc45ejgd_at_4ax.com>,
jeffl_at_cruzio.com says...
Quote:

On Tue, 8 Jan 2019 20:02:30 -0800 (PST), thekmanrocks_at_gmail.com wrote:

Jeff Liebermann wrote: "Try 1650 KHz instead. Kilocycles died 50 years ago."
Any tech worth their salt understands both.

Bulk table salt sells for about $100 per metric ton. Methinks I'm
worth more than that.

They express the same value.

Not the way they were originally written. Hz = cycles/second.
However, the original comment was "16,500 kc" which is just cycles. No
way to know if that's cycles/sec, cycles/minute, cycles/fortnight, or
just counting waveform cycles. If he had written "cps", which means
cycles/second, I might agree, but not kc.


But at least it was "k" for 1000x, not "K" for 1024x ...

Mike.

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