Linear Question

Never had one of those, but I suspect the second switch is a SSB delay switch...When on SSB you would need that switch in the "ON" position... You can leave it turned on with AM also, but there will be a slight delay of the Amp when you un-key.


The last switch is just your HI-LOW switch which will reduce your watts slightly when turned in the LOW position.

By the way, I seen in another post where you were saying something about having a RFX75 added to your radio...."IF" you do, you wont be able to use that radio with this Amp....well you can, but you will smoke the Amp...Just a little "FYI".

 

Self explanatory if you look carefully at the face. The white line from SSB to center is telling you the center switch is SSB time delay for the keying circuit. On = delay, off = no delay for AM. The right switch is labeled Hi/Lo indicating high low power. You should normally operate it in low power, using high only for limited duration at times you need the extra power. The stock carrier is going to saturate the finals overheating the amplifier as well as sounding muffled which is yet another reason to keep it in low power.

 

I have one of these, but it is an older one and there have been mods to the switches. I would have the PA switch on your cobra fixed to a hi/lo power switch. These amps don't last if you put much more that 1.5 watts into them. Mine will swing to about 175 watts on AM if I remember correctly.

 

Our coverage is very terrain dependent, line of sight. as far as talking to your buddy. Traffic near him on other channels will change that also. Buildings, hills and even trees all take a toll.

10 miles for conversation is not bad overall. Not know all the variables kind of hard to say.
I have had days where I could talk across the country but not across the street. You just never know.

There are situations that lend themselves to distant coverage, mag mount mobiles are not one of them. When Im up at a high elevation repeater site like Mt Wilson I can talk to San Doego and beyond on 1.5 watts. The points is there are varibles to every story

 

What Powder Joints said. It depends on conditions and terrain. Late at night when the noise level is down and on flat ground or up on a hill, anywhere from 10 to 50 miles or so. When the skip is rolling I've talked a 1000 miles or more. On a regular noisy day, you will get out further than a barefoot radio. How far that is depends on a lot of variables. Those are nice little amps. I've had mine for several years. But, I'm only driving it with about 1.5 watts or less. Mine has a pre-amp which I never use. I remember I didn't like how it worked and we re-wired it, but I don't remember exactly what we did. When I say 'we' I mean my most excellent technical person......I watch and supervise!

If you wanna really be obnoxious, I've got a Texas Star 667V I'd sell for $275.00. Looks a little rough on the outside, but good as new on the inside.

P.S. I just noticed your's is not a KL-300......mine is old. I'll bet yours has mosfets for finals, thus the different model number.

 

You are also failing to consider the squelch setting on the other radio. You cannot determine how far you should be 'getting out' when the other radio is not running at full sensitivity, combined with the other variables mentioned. Which also includes the variables of the radiation pattern and direction of the mobile, and variations in squelch threshold every time he sets it. There are many constantly changing variables involved.