[tkwalker]

Originally Posted by Alphahawk

CHIRP is CHIRP......unless as some claim Garmin is not using true CHIRP technology. But unless one has some really good test equipment no one can say if that is so. You will see a much more detailed sonar return with CHIRP. It does it by transmitting multiple frequencies from the low to the high range.....where as non CHIRP sonar is just transmitting one frequency....or maybe two. CHIRP broadcast a range of frequencies from high to low or low to high.....to paint a much more detailed image. This has been used in radars for some time. Gave us a much better info of the target and started being used in phased array radars.....my experience with it was in the PATRIOT System....except we called it pulse compression.....but it is same thing. Bottom line you will get a great looking image. You should be able to see individual bait instead of say a bait ball.



Regards

Randy, Same technology we use in Viet Nam in Airborne ECM (Electronic Counter Measures ) I am sure more refined now ... This was tried on us by the Russians in 1968 when the SAM Missile sites was trying to lock on to us while we were orbiting (EB-66's) to protect the F-4's from the SAMS during their strike objective .. They kept Ramping there Frequencies to avoid us ... So we did one better ...

We took their signal, phase shifted 180 deg's. modulated it with noise and sent it back to them at thousands of more watts that their receiver was expecting ... Since they were varying their frequencies we had to go up and down the band ... Using magnetrons, Backward Wave Oscillators (Carcentrons) , TWT's ... etc ... Hopefully frying their screen !!!

And No, those where not the good old days I want to relive ... It wasn't fun to watch a missile heading for you or the F-4 you were sent up there to protect ... You could not have drove a straight pin up my butt !! ...

Sorry, Chirp just released an old Memory bank that has not been opened for 45 years ... <'TK><