HDS live says my radar source is unknown - Boating

This may help:

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...

check to make sure u have the positive power to the centare of the lighter ,sum mistakes are made in manuf. and the power leeds are switch ,ive seen many

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

Test your Lowrance HDS 7 on different power sources e.g. on another motorboat to find out whether this is the problem of the boat's power supply or the HDS 7 itself - this advice will only help you to determine whether to call the boat-repairman or the lowrance hds 7 seller warranty service.

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.

right at the ignition use a multimeter to test out the constant

The manual is not available from any source anymore. Not only that, this model only detects X and K band radar. It does not detect any Ka band radar nor laser. You don't want to use this older model as a means of defense against modern police radar and laser guns.

If you live near a cell-phone tower, your radar detector can pick up on the waves coming from it. If you like in an area where radar detectors are legal and Ku band is not used, I recommend turning off the vg2, spectre and Ku bands on your detector. This will not only cut down on some of the "noise" but also make your radar detector more reliable for when you are actually "zapped" by law enforcement.