BELKIN TUNECAST 2 MOD PDF

Belkin Tunecast 2 mod. Extending the range of the Belkin Tunecast II. This is a cool toy, the fact that it has a phase locked loop and can be tuned anywhere in the FM band with a big radio station sound. The question is how about the battery life and how far will it transmit? They claim it lasts up to 10 hours so when putting in a new set of AAA batteries the current reads about milliamps then as the batteries drain, goes up to maybe milliamps then quits.

Author:Sakora Zolotaur
Country:Malaysia
Language:English (Spanish)
Genre:Politics
Published (Last):28 April 2019
Pages:187
PDF File Size:20.19 Mb
ePub File Size:13.83 Mb
ISBN:747-1-33915-868-4
Downloads:37171
Price:Free* [*Free Regsitration Required]
Uploader:Zulkinris



Belkin Tunecast 2 mod. Extending the range of the Belkin Tunecast II. This is a cool toy, the fact that it has a phase locked loop and can be tuned anywhere in the FM band with a big radio station sound. The question is how about the battery life and how far will it transmit? They claim it lasts up to 10 hours so when putting in a new set of AAA batteries the current reads about milliamps then as the batteries drain, goes up to maybe milliamps then quits.

This is because the voltage is stepped up and regulated to 4. This gives steady performance until the batteries are dead but AAA batteries are quite small and I don't think they have this much energy in them. Does anyone want to verify this? Larger AA or even D batteries would work much better. Another bad thing is the 1. They would become totally drained and would eventually leak and ruin the unit.

You must remove the batteries whenever it's not being used even if only a few days. It might as well not have a place to put the batteries with a flaw like this. Since I know you've been looking at this web page, you guys at Belkin need to figure out better ways to conserve energy in portable devices.. There is an external power jack for automotive use marked DC input 12V ma, a total of 2.

Are they lying? You won't quite need a diesel generator but the battery pack from your Intel Centrino laptop might not be big enough. Connecting a variable DC power supply with a meter shows it's only 41mA at any voltage. Not the as marked on the unit. The DC input can be anywhere between 7 and 14 volts because it goes directly to a 5V regulator inside. Any kind of external regulation is not needed, so if operating from AC power A 9V ma unregulated wall transformer works best.

Don't use one rated for12V because there is an increase in voltage when not fully loaded which might exceed the rating of the 5V regulator. For example an old cordless phone adaptor is usually 9V and would work perfectly with the proper end on it. The signal strength is a little lacking and even at only 30 feet away gives fading and static.

Why is the signal so week this close to the unit? Older gray colored versions of the Tunecast lose their memory settings and reset to This wouldn't work while it's powered from a hard drive connector after doing a shutdown. It would need it's own AC adaptor plugged in all the time. The newer white ones are fixed. Some good things are the phase locked loop, good sound, and the 12V input that eliminates the need for batteries.

Best of all extending the range of the Belkin tunecast 2 for better reception is possible by adding an easy to build external RF amplifier. The following is a theoretical exercise for educational purposes only, and not a definitive solution for boosting the tunecast output power to get better reception.

It cannot be offered for sale. Performing this mod might damage the device and void the FCC certification. Any FCC violations or damages that result will be at your own risk.

This mod should not be attempted unless you have the technical expertise and soldering skills needed for such a project. An ESD safe surface mount soldering station and microscope are required. Take off battery cover. You can see the blue wire is used for the antenna and it's wrapped with the other wires in the audio chord. This would attenuate the RF radiation so a separate antenna wire lead would make a good first mod.

This image shows the blue wire cut, the blue inductor at the top shorted, and where the coax is attached. When the unit is assembled, the coax can be routed out the hole where the audio cable is stored.

The measured signal level is dbm at That's not much power if you need it to go very far. The coax can then be used to drive an external RF amp described here. It'll take allot of gain at least 20db gain to get any good range, but it's a nice stable stereo signal, and this amp will do the trick.

Here is an easy to build hand wired prototype RF amp that has up to 32 db of gain and is constructed on a piece of circuit board with ground plane on one side. This photo shows a 2N similar to NTE77 in place of the MRF which has 2db less gain and 2db less max power output but still plenty of signal for around the house and it is more plentiful.

The amplifier operates on 12 volts DC at 60 milliamps. The filter on the output has a good flat band pass and good harmonic rejection.

These plots were made with the better MRF output stage. The second plot shows harmonics to be well suppressed by the filtering.

Spurs seen in the third plot are present in the original un-amplified output and are probably generated by digital circuits in the BH chip but are low enough not to cause any harmful interference aside from the main signal itself, and are amplified along with it.

The marker reads Best just to stay with the original un-modified version. Example of a complete TuneCast system with all cables attached. RF output power is about milliwatts.

GEBRU TAREKE PDF

Belkin Tunecast II FM Transmitter Mod

Two different tutorials on modding the Tunecast II transmitter by adding a more effective Antenna. I did the latter of the 2 and it worked well. Me too,.. I can now take a length of RG6 coax and screw it into the unit to get different antenna lengths. I live very close a mile to an FCC monitoring station and have to be very careful about sending too strong a signal.

ISMET MUCUK PAZARLAMA ILKELERI PDF

Belkin-Tunecast-II-FM-Transmitter-Mod.pdf

Belkin is a popular manufacturer of cheap and cheerful computer accessories, having singlehandedly made the USB hub sexy! It is only earlier this year that FM transmitters like these became legal in the UK, ignoring the fact that savvy netizens have already brought theirs from eBay. This modification improves the transmission range and remove the 'feature' of auto-power down when no audio signal is present. It certainly sets you up as resident pirate radio DJ of your block and allows you to jam the loud radio listener on a bus or train! Please note that this is a rehash of something that was done before 'instructable' came along.

ESERCIZI DI CALCOLO INFINITESIMALE E ALGEBRA LINEARE BRAMANTI PDF

.

Related Articles