I have had many FM transmitters over the years.
Right now, I only have a few Part 15 FMs here. Some of
my other FM transmitters are in other locations.
Anyway - I use the
Maxell P-13 (certified) to run the computer audio
out to radios that are here. Lately, it's been
streaming stations of most of you guys. The Maxell
is an odd beast. A little round thing that just plugs
into the computer. 3 AAAs, a blue power-on LED, and
just 4 channels, as mentioned before. 88.1, 88.3, 88.5,
and 88.7. Not easy for me, or anybody - I figure - with
just those 4 channels. Also, it only does about 80 percent
modulation - and the EQ is wrong.
Still for an audio link - man - you can't beat it. Just
put it in your pocket and go wherever you want.
You can lose it in your pocket.
The P-13 came after the Maxell FMT-1. The FMT-1
had a red power LED, and a very small antenna wire
in the battery compartment. I've never seen an FMT-1,
but I think the wire could hang out the bottom of that
transmitter. So when Maxell went from the FMT-1 to the
P-13 (why do they call it a P-13) they changed the color
of the LED, and got rid of the little antenna wire. Otherwise,
all is the same.
I'm very happy with my Maxell P-13. It is what it is.
OOOps. The batteries ran down again. Back to the
charger.
The only other transmitter I have here is a Whole House
1.0 circuit board that came from E-bay for about 9 dollars.
It seems to be the right field strength, but if you put the
transmitting antenna next to the board you get RF feedback.
Other than that it appears to be clean RF wise, but I don't
use it much. It needs to go into a shielded case, and needs
some other things to make it practical.
Now to my real question - the Sainsonic FM transmitter. That
sure looks like an FCC certification number. The Sainsonic can
do 500 miliwatts and can go out of band down to 76 MHz.
However, as we know, the Whole House FM transmitter can
do the BETS field strength. Also one of our members has
an FCC certified Part 15 transmitter that can also do 87.5,
87.7, and 87.9. (I forgot the manufacturer and model number,
but if you told me it- I'd hit myself over the head and say,
"Oh - right!")
I've heard that some of the clones of the Sainsonic had
problems with unwanted RF products outside the desired
operating channel. Several manufacturers seen to market
this thing - they all look the same - but are under different
names. So the Sainsonic is the only one out of the bunch
that passed certification? Was it a mistake? Back many
years ago, the FCC certified some kind of AM "Real Estate"
transmitter that was too strong. I want to know more about
the Sainsonic. I need something with more than 4 channels,
and is in a good strong enclosure, and is NEW. Mono would be
great, but I don't know if the Sainsonic does mono. In the
$54.00 price range, this is less expensive than many other
Part 15 certified FM transmitters that we KNOW AND TRUST on
a technical level. But is the Sainsonic really any good???
Does anybody with the ability to see if it is "clean RF wise" have one?
Is the certification a mistake?
If I was rich I would just get one to check.
Best Wishes,
Brooce, DOGRADIO
Broadcast Vision still around.
The SainSonic is 100% Clean. I know this because I had to call an ambulance because of someone who had a heat stroke working outside my house. I forgot to turn off the transmitter and the cops and paramedics were in the room right outside of where I transmit. No interference was caused but I quickly remembered Oh crap gotta turn off the transmitter. If I would have caused interference I would have gotten arrested right johnny on the spot by the police here as they don't play here in this town. And as reported the SainSonic is even cleaner than the $125 Whole House FM Transmitter 3.0. Out of the box it is set to 88.1-108 Mhz and the wattage to -48dbm and can be set to the 500mW setting and can be reset to go to 87.9 Mhz but here in the USA that is a gray area. Even at the high power level the RF beats the Whole House FM Transmitter all over the place. Though it comes from China SainSonic made sure that they modified this transmitter to the specs SainSonic wanted. The FailSafe, Sinstec, and all the others are knock off copies and are not the same thing as the SainSonic. The SainSonic is aluminum and made extremely durable. I run mine all the time and is the best Transmitter I ever owned even better than the one I had years ago. I'd never IMHO buy the Whole House FM Transmitter 3.0 after I heard so much about spurs and harmonics something the SainSonic does not do yes even at High Power it causes less Interference to the FM band 10 foot away than the Whole House FM Transmitter 3.0. More money doesn't necessarily mean better in this case. I've research this for more than a year before I bought the SainSonic and darn glad I saved $100 and bought this one.
Audio-wise, I think the knock on this uncertified transmitter is that it is 50 uSec rather than 75 uSec.
Brooce, the Sainsonic really is certified. The entire purpose of certification is to allow them to sell the transmitter they got certified in the U.S. That number does exist in the FCC database (or at least it did a little while ago).
Whether the Sainsonic that is being shipped from China really is the same one that was certified is unknown (in my opinion). The existence of a 'high power' switch obviously doesn't matter to certification, as the Whole House 2 & 3 has those (and the original C-Crane had a hidden power adjustment), and they are/were certified and sold in North America. The fact that Sainsonic is advertising up to 1/4 mile range is suspect, as there's no way without an elaborate receiving system, including an outside directional antenna, that you could receive a legal Part 15 signal that distance (and even then, I'm not sure). However, that could just be the marketing hype. The transmitter box as shipped does have the certification number on it (according to theLegacy), so anyone purchasing it certainly can't be accused of attempting to circumvent the rules.
It would be interesting to measure the field strength of the stock, out of the box Sainsonic.
John, are you talking about the Sainsonic? If so, do you know that the pre-emphasis is is 50 as a fact?
It is 75uS not 50 uS ans I both called and Emailed SainSonic to make shot gun sure it was 75uS. This was a mod SainSonic had the Chinese do to the transmitter to meet their specs. James told me many folks wanted to have the 75 uS pre emphasis so this transmitter has it. I bought it just before June 5th and it was shipped to my Studio's here at The Legacy and I can tell you it came certified. So this transmitter is the real deal. Audio quality meets the Album Rock standard and I'm picky about audio. The volume will be a little less than a commercial licensed station. Here is how to set it up using NextKast.
1. Purchase a separate sound card. I got mine on Amazon for $16. Set the volume of the separate sound card to 35%.
2. Set NextKast's second sound card to your new sound card.
3. Set the Audio volume on the SainSonic AX-05B to point to where the two halves of the transmitter meat the line if you will.
Now start your encoder in NextKast. Turn on your SainSonic AX-05B and set the frequency to a blank one. Your done and sounding Rock Solid. The 1/4 mile range is on High Power. You'll have to follow the instructions for High Power as out of the box you get -48dbm. It is far less than 1/4 mile as there is some fade when you walk around the house in a few areas. But this transmitter sounds great. Best I've heard under $300.
There are no applications on file that match the search criteria specified:
Grantee Code: 2ABT5 Product Code: AX05B7C
To Artisan, Yes they are 50 uSec
very much.
Great into from everyone - this will help me to
figure out what FM transmitter to get next.
Bruce, DOGRADIO
When I put the whole string in google I did see the FCC database with the certification for the transmitter. I don't know how you got the revised one as 50uS because I was told it was 75uS. Maybe it would have a little more highs at 75uS but still it does not sound too bad compared to some other transmitters I've heard. I don't have a scope to really tell if it is 75uS.
If you go directlt to the FCC database Sainsonic has only 1 product certfied and it is not a FM 88.1 to 107.9 transmitter. They falsly state on the web site that it is certifed.
https://fccid.io/document.php?id=2216818
As you can see there was two versions of the transmitter. One with the BNC and the other with the TNC (Revised transmitter). I don't know why you could not find it in the FCC database but when I went to google and entered the string for the FCC ID# it did come up. You can even see the inside circuit and it does match the CM-10 except that it has a connector and a rubber duck instead of the telescoping antena on the Decade. Plus you can see the full name and entities associated with SainSonic when you open this link. I did't see any froud here. It all looks liget here. Hope this helps.
That is a bogus site. The FCC does not sell advertising on thier site. Here is where you want to go: https://apps.fcc.gov/oetcf/eas/reports/GenericSearch.cfm
I swor I found it before. I'm not sure why it has to -48dbm and why at low power it acts like most of the part 15 transmitters out there. Plus the manual has the usual stuff about part 15. If they faked this they did a really good job of it. I'm just wondering if there is a reference issue here. If I just do the grant code I come up with other stuff from SainSonic but not FM Transmitters.