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Vhf radio cobra mr 75 will only transmit recieve at short range ie 1km even when on high power

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If there is power output, you need to use a watt meter and verify that your antenna is good. Depending on the antenna you can also check for a shorted or open connector or cable with an ohm meter.

Hope that helps...

Geno

Posted on Mar 05, 2008

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Posted on Jan 02, 2017

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2 Answers

Transmitter/receiver pair for RC devices


Sorry I can't comment about your gear but before spending your money I advise you to check on what sort of licences you need to operate what is effectively a local broadcast station. Governments and regulatory bodies take the protection of their radio frequencies very seriously and licences for transmitting on selected frequencies can be expensive and available only to suitably qualified people.

An example of suitable qualification is a proven competency or ability for the equipment operator to be able to check and/or ensure the installation doesn't cause third party interference and if it does make suitable adjustments or modifications.



With the exception of citizen band radio I believe only low power radiation of up to 100mw can be operated without a licence and unless using a microwave link with dishes I think you will need many times that power for reliable transmission/reception. In addition such frequencies as used by CB and ham radio, continuous transmission or transmitting entertainment would be illegal.



Causing third party interference or infringing broadcast regulations often results in at least equipment seizure so please ask the right people the right questions before you begin.

Jul 06, 2015 | Audio Players & Recorders

1 Answer

Do i need an antenna to recieve FM radio?


Yes. Stereo receivers typically have either screw terminals or a coax connector on the back for an FM antenna. You can use a TV antenna for this since FM radio is in the middle of the old TV VHF band. However, if the station you want is nearby, you can pick it up with a piece of telephone hookup wire (solid 28 gauge copper) connected to the antenna screw terminal (strip the insulation off the end of the wire that is connected to the terminal, but leave the rest of the insulation on). If you have only a coax connector, slip the end of the wire into the center terminal on the connector. The wire ideally should be about 30" long, but you may get by with less.

For more distant stations, you may want a long-range TV antenna.

Mar 22, 2015 | Audio Players & Recorders

2 Answers

How do i wirelessly connect the reciever to the speaker system/tv?


You'll want to research an adapter for this. Radio shack probably has one of the most inexpensive units available today, but you can find others online, with better quality sound. Start with a google search for what you are trying to do. Google, "how to connect speakers to stereo, wireless".

Keep in mind, not all speakers are created the same. Some have amplifiers in them and some do not. This will change the type of adapter you will need.

Fairly new adapters on the market may transmit audio over a wireless network or even Bluetooth, you will need to research your receiver and/or tv to see if either of these are options for you. Another common thing is a range of branded theatre A/V sound systems with wireless sub woofer and/or back speakers.

Good luck with this, it should be a fun project.

Apr 30, 2014 | Panasonic Se-fx50 Digital Receiver

1 Answer

My nad t753 reciever went into protect mode. i switched it off and was able to get it back into standby mode. The receiver switches back on but no sound comes out of the monitors. I can even switch between...


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Aug 31, 2011 | NAD T753 Receiver

1 Answer

Is the aerial input on a Sherwood Stereo tuner TD130SB 75 or 300 Ohm?


Hello,
You can use some speaker wire. and pull it apart until each leg is 2 1/2' long and then connect it to the balanced antenna input. Or you can run that 2 1/2' (each leg) of wire to the the coax connecting one side to the shield and one side to the center core of a 75 Ohm coax and then run the coax to the FM input on your reciever. The (two) [2 1/2'] legs create a dipole and the coax prevents high SWR and improves recieve. Remember it will work best the higher you get it.
Regards,Tony

Apr 12, 2011 | Marantz ST7001 AM/FM/XM Stereo Tuner

1 Answer

My Klh r3000 receiver is great for everything except picking up am or fm stations? I had an antenna attached, but the unit is in my basement, and I get no signals at all. What could I be doing wrong?


If the antenna is in a basement that is the problem - the fact that it is below ground means that no signals can get through.
Radio signals are blocked by buildings, large lumps of metal or other solid objects as well as strong magnetic fields (which can include electrical devices within the home).
To pick up good radio reception you will need an external antenna above the ground level - preferably as high as you can get it. Unless you get an omni-directional antenna like this one http://www.maplin.co.uk/vhf-fm-omnidirectional-aerial-874 you will need to point the antenna accurately at the transmitting station (+ or - about 5 degrees) for FM. At a pinch you might get by with an indoor aerial but it needs to be above ground level (inside a roof would be best)
Good external AM Radio aerials are harder to find these days.

Feb 24, 2011 | KLH R3100 Receiver

1 Answer

WHICH RANGE OF SPEAKERS CAN I USE ON A KR5030 RECEIVER? HOW MUCH INPUT POWER SHOULD THE SPEAKER ALOW? (WATT)


Well that reciever is rated at 60 watts per channel, I believe. I would choose a speaker that is rated for 75-100 watts.

Feb 20, 2010 | Kenwood Audio Players & Recorders

4 Answers

My icom 706 mk2g powers up, receives, but when i push the mike ,the radio turns off, help


Hi

I had a similar problem on my 706 MK1. The problem was corroded connections on the white power connector at the rear, When on tx the voltage drop across this connector was great enough to switch the radio off. try cleaning/re-seating this connector

EI4HO

Dec 10, 2008 | Audio Players & Recorders

1 Answer

Trying to hook up jbl sr4732 speakers the highs are to loud compaird to the bass or lows. im only using a onkio with a 100 watt per speaker.


These JBL speakers are not made for a home stereo reciever. It could be part of the problem.

I do know that they have a high frequency input and a full range input on each speaker.

I am going to guess that maybe you have them connected to the high frequency input.

Are you using 1/4 inch jacks connecting to the input of the speakers?

I don't remember these speakers having a input for wires.

You may have another issue using these speakers with that reciever.

The JBL speakers are 4 ohms each, it is very likely that the onkyo requires 8 ohm speakers.

Look on the back of the Onkyo where the speaker jacks are at and see if it says anything about the minimum impeadance.

The impeadance is the ohms. Most home recievers are not designed for anything less than 8 ohms. Some are, but most are not.

Using 4 ohm speakers on a system that requires 8 ohm speakers can cause damage to the reciever. Mostly at higher volume levels, it will cause the reciever to overheat and shut off, maybe short out a channel. It pulls 2 times the amount of current thru the output transistors as 8 ohm speakers.

Let me know if this helps you or if you need more help.

Jun 18, 2008 | Audio Players & Recorders

2 Answers

Sonobuoy deplotyment


you should check out the web site of thales or Ultra for information about both frequencies (Radio and hydrophone).
and you should check the frequency setting option, they all have it.
here is a link that will tell you the Freq. http://www.ultra-scs.com/pdfs/pdf_sonobuoy.pdf

Oct 01, 2007 | Cambridge Audio Azur 540R Receiver

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