Does anyone know where I can find a part 15 long wave transmitte? North country Radio had one but it was discontinue.
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Long wave part 15 transmitter
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CardioTheater FM transmitters on Ebay
These are the predessesors of the current Broadcastvision AXS-FMT(that I have) and are excellent quality certified for part 15 and Canada RSS-210. There's several available(new other) and at less than half the price of a new Broadcastvision.
Just thought this may be of interest to some.
https://www.ebay.ca/itm/NOS-Cardio-Theater-XTV-FMT-FM-Transmitter-w-Powe...
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Sean Cuthbert C-QUAM
| Attachment | Size |
|---|---|
 Front of the C-QUAM | 140.53 KB |
| Back of the C-QUAM | 166.86 KB |
| C-QUAM Board | 263.35 KB |
So - I bought this sean cuthbert c-quam transmitter.. and I want to do a gound mounted outdoor setup.
I am thinking of buying the weatherproof box from home depot - its 8x8x4 ; and a length of copper pipe.. I want to stick the pipe in a bit of PVC and make it kind of hidden..
Has anyone done a setup like this at all? Care to share? I'd like to see photos and stuff.
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Canadian "part 15" station
This seems to be near where Artisan used to be and does pretty good with a part 15 transmitter.
http://www.radioxy.com/89fm.html
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Wat Are Your Plans for Station Growth?
The low power radio community as reflected on these forums tends to consist of single stations with music formats. Growth is usually talked about in terms of obtaining a better transmitter, improved antenna, and larger playlist.
KDX Worldround Radio and HBR (Jim Henry's Honeybrook Radio) are the only two talk stations I know of, not counting LPFM stations like WCFI (MRAM) and WLSL (DHR). It is surprising there aren't more talk stations given the volatility of world affairs.
Since our inception in 2007 KDX has been on a Yo-Yo string always expanding and shrinking as we try new things and then pull back because of limited resources.
In about 2010 we first tested the running of two radio streams from a single computer, with KDX1 and KDX2. This came about as a response to finding more good radio programs than time allowed on a single station, but if audience measurement was an objective the effort did not result in more listeners, but that has never been more than an observation since KDX exists entirely to serve myself in a terribly bland radio market where sports and Christianity account for millions of wasted watts that do no more than give me something to criticize and avoid.
Now it's growth time again as I have three formats in mind and look forward to being able to select, based on the mood of the moment, by simply turning the dial, rather than fiddling with a single playlist.
In this thread I'll be laying out the experiments and advancements as KDX divides into three distinct stations: KDX, KHZ, and KEGO.
We'll need more transmitters and antenna sites, as well as enlargement of our computer power to accomodate so many program feeds while keeping it manageable.
During this whole process I want to get other stations thinking about their expansion plans and adding your experience to this thread because this hobby has been slumping and seems stagnant, if our forums are any indication.
Is the age of part 15 and low power radio becoming yesterday's hobby? Don't you think it's up to us to keep it on life support and promote new growth?
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The Fading of the Low Power Transmitter Age
The apparent end of the AMT5000/3000 transmitters from SSTran has injured my hope for the future of this hobby.
Prior to that we lost the best FM kits when Ramsey closed their kit division, and another loss came with the discontinuance of the AM88.
There are some light-weight AM kits around, the over-priced certified AM choices, and the Decade and EDM for the ridiculously trivial FM power allowance, but even those are very likely day-to-day and could also vanish.
If the hobby has a future it is because we will design and publish our own transmitter circuits and force future participants to learn a little bit about electronics.
A committee of our members have designed a part 15 shortwave transmitter ("Big Talker") and got half-way through sketching a long wave ("Deep Voice").
Now we must get back to work and develop an AM transmitter circuit so we can build our own.
For my outdoor antenna site I'd intended to obtain another AMT5000 but that door is closed and the solution will be a homemade transmitter which probably slows the whole project by at least another year.
Another shadow casting itself over the hobby is the FCC's abandonment of its public trustee status having become a servant of corporate big money masters. Yet here we are pledging allegiance to part 15, the sloppiest regulations ever written.
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Any recommended brands of "inexpensive" Part 15 compliant portable FM transmitters?
Hello all,
I apologize if this has been covered in depth before; I have searched the site.
I am new to the site and have been searching this forum, googling the net, surfing eBay, Amazon, etc and have not yet figured out if anyone makes decent quality, part 15 compliant equipment that would meet my needs.
My use case is small outdoor events, like car shows. I'd like to find an FM transmitter that can operate on 12v in a car, where the other cars at a show can tune their radios to the same freq and we can broadcast lower volume music and announcements for nice ambiance at events, as opposed to a pair of loud DJ speakers blaring into the crowd. Similarly, we could strategically place various inexpensive FM receivers (boomboxes, etc) for an amusment park-like distribution of the audio. This would be less expensive than wifi transmitters and high-end portable speaker systems.
I would prefer stereo, in case we ever have a desire to actually place speakers to effect stereo sound, but I realize that scattered speakers/car radios defeat the purpose of stereo. I also know you take a big signal to noise ratio hit with stereo and lose range...so I am considering mono. (Maybe something out there is switchable?)
However, try as I might, I cannot find a transmitter (say, under $150) that is part 15-compliant AND is more than just a local FM modulator for in-car use. All the transmitters I have found on Amazon, eBay, etc in that price range, down to about $50 are of the "very shady" variety, with a "low power" mode that is "recommended for FCC compliance" but turn out to be WAY too low in the reviews. Or they are 1 watt or some other ridiculously high output. Or they bleed across a range a frequencies or cause noise and interference in the closest receivers. I am talking about stff from Fail-Safe, FMUser, CZH, Signstek, etc. They look ideal, until you look at the details/reviews.
Are there any decent quality manufacturers of 12v powered transmitters that actually provide a "max legal" signal strength, with clean signals, so I can get a range of a couple hundred feet? Without spending $200 or more ?
A friend who knows such things recommended this mono unit: http://www.progressive-concepts.com/products/Mono-ACC100-FM-Transmitter-... which is at the max of the budget. Is there anything else I should consider ?
Any advice is appreciated!
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Where Has All the Power Gone?
On a scaled map of my little neighborhood I drew a circle around my transmitter extending 200-feet in all directions.
The majority of the field consisted of emptry space.
On one edge of the circle was one neighbor's kitchen, and on another side of the circle was a neighbor's bath room.
Maybe if I change formats they'll put radios in those rooms and start listening.
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Talking houses
saw some on ebay using keywords "am transmiter" in case anyone is interested.
nice cheap way into a plug and play certified transmitter
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LPB Carrier Current AM
there is one on ebay right now. it's currently on 640khz meaning it's a low band model, 525 to 900 khz 20 watt keyword "AM Trasnmitter"
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We Need Backup Transmitters
Are we aware that professional radio stations have backup transmitters?
They are prepared for the event that the main transmitter may break down, and the spare tranmsmitter lets them get back on the air within seconds.
In some cases the backup transmitter is located alongside the main.
Just as often the backup is located at another building or tower somewhere nearby.
Here at KDX Worldround Radio we expect to have backups for all our stations. Over 20 transmitters!
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Quick Review of Decade CM-10 (and the Chinese transmitter it is based on)
I recently purchased a Decade CM-10 (now discontinued) from a Canadian reseller on e-bay - it was supposedly a demo model.
I had issues right from the get go on the audio and range. Audio was very low, warbly and range was bad (barely a few feet). After some trouble shooting, it turns out that the ground isolator, which works on every other transmitter I have, was causing problems. Once removed from the audio chain, things started working properly.
Even though theoretically this transmitter should be tuned to Canadian BETS limits, range is still poor compared to other transmitters I own, such as the MS-100. I suspect that this is a Part 15 tuned unit, as its range is on par with the Maxell P-13 I recently purchased and did a quick review on (to be fair, range is a bit better, but the Maxell is intended as an ipod type transmitter, not a serious broadcasting device).
You generally get what you pay for, and this transmitter's cheap Chinese origins are apparent in the audio quality. Although admittedly subjective, it's not nearly as 'full' and nice sounding as the Decade MS-100 or my Landmark FM-350 (about on a par with the Maxell). Bass is lacking, and it sounds somewhat tinny at high frequencies.
I can't drive the modulation nearly as high as I can on the MS-100 or Landmark either - here, it's also comparable to the Maxell.
I've contacted Decade to see if there's a way to determine the country of tuning. I've also asked if there's a way to transmit in mono only. I'll post the results when I receive them.
Interestingly enough, even with its relatively short antenna (not tuned, at least in terms of length), I find that the transmitter's range is substantially more at lower frequencies - I obtained the maximum (several hundred feet before fence boarding on my car radio began) at 88.3, and it went steadily down as the frequency went up (just over 100 feet before fenceboarding at the high end of the band on 103.9).
Other than frequency agility and the potential ability to tune to Canadian standards, there really was little to recommend this device over the Maxell P-13. And the Maxell cost me US$1 (plus shipping).
Unless you can find one of these really cheap on the used market, I wouldn't recommend shelling out the money. There are much better alternatives available at the same or greater cost (US$100+), and much cheaper ones that give you equivalent quality.
And I wouldn't touch the untweaked Chinese transmitters readily available, based on this experience.
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Procaster: Warbling sound when other stations appear on the frequency
In recent weeks, I have been repairing and rebuilding the transmitting array of a fellow Part 15 AM broadcaster in Worcester, MA. Currently, there are three Part 15 AM transmitters in operation in this city. All three of them are Procasters and all three, to a greater or lesser degree, have the same problem.When any of the three transmitters are operating in the clear, with no detectable interfering signals present (such as during daylight hours), they behave just like any other low power or full power transmitter. But as soon as distant stations invade the frequency, a terrible warbling sound is heard that completely distorts the audio coming from the Procaster.This problem not only cuts down on the usable range of the Procaster in areas where its signal still dominates. It also gives the listener the impression that a pirate broadcaster with cheap, inferior equipment is operating on the frequency and creating a sonic mess. Needless to say, that is the last impression any Part 15 broadcaster wants to make.At first, I thought that the transmitter was significantly off frequency, since it is a remote possiblility with PLL tuned models. But that turned out not to be the case. Then I thought that perhaps the build in audio processor in the Procaster was a cheap afterthought and it was responsible for the problem. So I bypassed the unit's own audio processing, which improved the sound. But it did not change the warbling in fringe reception areas every time another station's signal crept on to the frequency. I was wondering, has anybody with experience setting up and operating a Procaster noticed this performance flaw? If you have, did you find any way to fix it? I am appalled that the second highest priced Part 15 AM transmitter on the market would allow such an obvious problem to go uncorrected. Right now I'm really missing the frugality, intelligence, and flawless operation of the SSTran AMT-5000, that's for sure.
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Homebrew AM Stereo Transmitter
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Had an idea for FM...don't know yet if it's good or terrible.
Those little things you often see at Walmart or Target or whatever other places that use a car's cigarette lighter plug to power them, and use a USB or 1/8 aux cord to send audio from a phone, tablet, etc. to the car's FM radio...
1. Would you get any Part 15 type range out of them at all if you used one of those cigarette plug to wall plug adapters and used them at home?
2. Would they be Part 15 compliant? (it seems like these could be good cheap starter Part 15 FM transmitters until there was enough budget for someone to buy a Whole House or C.Crane)
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Weird Transmitter Find Of The Year
My friend - - the broadcast engineer -- dropped off a discardedmetal box onto my front porch yesterday.Built like a tank - - thick as a brick - - this transmitter looked similar toa Talking House unit. I thought itwas an AM transmitter - but No -it was an FM transmitter.FM??? What could that be?Here's what it says on thefront panel: Drive By RadioFM Transmission System.On the rear panel in printit says:
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Tube PLL Circuit
What Would It Take to Build a Tube PLL Circuit?
Wanting to follow in Neil's footsteps, I have a dream of building a medium wave transmitter using 100% tube technology. Step 1 is to design a stable oscillator.
As I understand it, basic MW frequency crystals have become difficult to obtain, so another method must be utilized to obtain frequency stability... such as Phase Locked Loop (PLL).
PLL circuits are common in solid-state form, but can they be built with tubes?
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Low Jolt Radio
The writing style of this article caught our attention.
Part 15 transmitters are called this because they are taxonomized within Part 15 of the FCC’s rules. They deploy or are activated by very little radio frequency power, in many instances jolts smaller than a milliwatt.
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Information Station Specialists - Talking House ATU
A few days ago I contacted Bill Baker at ISS about any new Part 15 products. He said that they were coming out with a better designed Antenna Tuning Unit. If anyone here wants to be added to an email list that's he's compiling please contact him at: Bill@theRADIOsource.com
This information is provided with hiding any links.
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Accurate Measurments Are Difficult
It's not just us, with our difficulty measuring field strength.
As it happens, accurate measurements are difficult for all scientists and technicians.
But things keep getting better.
By the way, KDX was happy to loan a picture of our Transmitter Room for the linked article.
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