View Full Version : 11m-10m conversion

09-16-2014, 11:20 AM
Anyone know how to converta 11m comp. style amp to 10m?

09-16-2014, 12:43 PM
I don't think conversion is necessary.

09-16-2014, 12:47 PM
if by comp. amp you mean a class C sold as a competition CB amp , and typically over driven to become a splatter box ...... they will cover many Mhz including 10-11-12 meters with no modification needed . please try to run it clean so you only transmit on one channel at a time .

09-16-2014, 06:25 PM
I will and do so now. Unless I'm bad wrong not putting 50+ watts drive to it and using GOOD coax should minimize the bleed over shouldn't it? Just about to get a super star 158EDX that will do both 10 and 11m and thought I would need two diferent boxes for the different bands. I'm getting a separate antenna for the 10m. Will be another macov5/8 like the one I use now but will tune it for 10m. They will be about 100' apart on opisite sides of the yard with the coaxes run to a switch box so all I have to do is flip the sw. when going from one to the other. Thanks for the help. 73s Karl

09-16-2014, 09:17 PM
if you get a gainmaster it's broad banded enough to cover 10 and 11 meters by itself . much simpler ............

09-16-2014, 10:02 PM
Just get a antenna tuner and use one antenna

09-17-2014, 10:21 AM
The class "C" amps sound like crap on SSB. Be sure you run LOW PASS FILTERS. One before the amp and one after the amp. Remember Garbage in Garbage out!

02-25-2015, 03:50 PM
The entire transmission system, from amplifier output connector to the antenna should be as short as possible. Forget the attempt to match wavelength, the gain isn't enough to matter. Tune the antenna to get the best match, 1 to 1 if possible. Then use a low pass filter backed up with a tunable filter and you'll be as clean as possible. Ragged amps can create so many harmonics that a clean SWR is impossible.

02-26-2015, 11:12 AM
Ragged amps can create so many harmonics that a clean SWR is impossible.

That's why the experienced technicians "NEVER" tune with the amplifier in line. If it is tuned at four watts it will still be tuned at 400 watts. You are tuning for the frequency not the power. Low pass filter before the amp and one after the amp will keep your signal clean. Unless you overdrive it.

02-04-2016, 06:58 PM
Yes, tuning the antenna at normal wattage (4 W) to achieve the best SWR is the first step. Transceiver and amp should be tuned to a dummy load before switching to the antenna(s).