My HDS live says my radar source is unknown. I am getting no signal on the screen.

Radar is microwave energy concentrated into a beam and bounced off approaching aircraft or ships or used for measuring the speed of cars, etc.

Low level microwave energy can be emitted by many sources - leakage from microwave ovens, various electronic equipment...

This may help

After black out of ship during audit Radar Model JMA 9303 no work.
Radar start work and after 15 sec. switch off.
Radar not show target and display error "ANTCLK ER" ( Bearing pulses are not
sent to the display unit)and "TRIG ERR" unknown error.
Antena of radar working.

Any body can suggest the solution

The higher the number the displayed the stronger the radar signal. For more information on the display and the radar bands - visit Whistler's Radar FAQ page on their website - www.whistlergroup.com

When a radar or laser is detected, the unit will make noise. As you get closer to the source of the radar or laser, the noise will get louder and the signal levels (if you have a detector that shows signal level) will get stronger.
Since police officers like to wait until you are close to them, they may keep their radar guns turned off until you are very close to them. Once they turn it on, you are likely to be busted unless you can REALLY slow down quickly. Most radar guns take a series of average measurements on the speeding car. If the samples are too far apart, it keeps looking for a series of successive speeds that are close. This happens in a few tenths of a second.
SO even if you hear a SLIGHT noise from your detector, it may have been from a brief instant on radar gun in front of you, so BEWARE until you are sure that there is no threat.

The valentine detectors use multiple antennas to tell you where the signal is coming from. This is handy.

Radar detectors use what's called a superheterodyne receiver to tune in the high frequency radar signals. A side effect of this design is that they emit a small radio signal at a predictable frequency, and thus devices like the Spectre can detect them. States like Virginia (where radar detectors are illegal, f*** that state btw) equip their patrol cars with Spectres to find those of us who use them. Many commercial enforcement vehicles also have them, since it is illegal at the federal level for any vehicle requiring a commercial driver's license to have a radar detector.

The only detectors on the market now which are known to not be detectable by the latest Spectre IV units are the Bel STi Driver and the Escort Passport 9500ci. Note that this is not the standalone 9500i/9500xi unit, but the full custom installed unit with laser jamming.

If you're not one of those unfortunate enough to live in Virginia, I wouldn't bother. If you do live in VA, get the STI Driver.

POP is a type of radar mode which only a couple of radar guns have. In essence, radar gun in POP mode emits an extremely brief signal to measure a car's speed. This brief signal lasts for less than 1/5 of a second. POP mode can not legally be used to write speeding tickets since it is not as accurate as the radar gun's normal operating modes, and since POP mode provides absolutely no radar tracking history.

Most people turn off POP mode in their radar detector's options since POP radar is very rarely encountered and since users experience excessive false alerts with POP turned on.

Spectre refers to the Spectre radar detector detector (RDD) which police use to locate drivers who are using radar detectors. The current Spectre models in use by law enforcement are the Spectre III and IV models. Some Cobra radar detectors claim to be able to detect the Spectre I. This is of no value since all Spectre I RDDs have been upgraded to later Spectre models which Cobra radar detectors can not detect. In short, turn Spectre detection off since this feature is a needless source of false alerts.

LED Display gives you your display visual alerts, signal strength, and operation mode. Here is an attached link for the manual.....http://www.uniden.com/pdf/LRD6399SWSom.pdf
But to answer your question here is what the difference between the green light and the red light are:
1. X-Band Signal Indicator—A green LED lights and blinks to
indicate the presence of an X-band radar signal. The blink rate
increases as the radar source gets closer. A distinct audio alert is
also heard.
2. K-Band Indicator— An amber (orange) LED lights and blinks to
indicate the presence of a K-band radar. The blink rate increases as
the radar source gets closer. A distinct audio alert is also heard.
3. Ka-SuperWideband Signal Indicator— A yellow LED lights and
blinks to indicate the presence of a Ka-SuperWideband radar
signal. The blink rate increases as the radar source gets closer. A
distinct audio alert is also heard.
4. Laser Signal Indicator— A red LED under L lights and blinks to
indicate the presence of a laser signal. A distinct audio alert is also
heard.
5. SWS Signal Indicator— When an early warning hazard or
informational signal is detected, the yellow SWS LED begins to
blink and the amber K-band LED lights. A distinct audio alert is
also heard.
6. Power-On Indicator— A green LED under P lights to indicate
power is being supplied to the unit and the unit is turned on.
7. LED Signal Strength Meter—Four LEDs give an accurate visual
indication of the strength of radar or laser signals.
8. City Mode Indicator—A green LED under C lights to indicate
that you selected City Mode.
9. Auto Mute Indicator— A red LED under M lights to indicate that
you selected the Auto Mute feature.

Please make sure you give me a rating and I hope this helps,
cbinny1

the higher the number the stronger the signal.

You should try to find out what type of radar devices your police uses.ESD7000 model does not support some devices such as Ku band radar signal, but it should detect all laser signal.Laser signal is often jammed by sun light.If your police uses radar detector detectors VG2 it will force your detector to hide from it making it invisible for detecting.Try talking to someone who has other type of detector that works in your town.It is possible that you will be forced to buy another model.