| Author |
Message |
    
Buckshot
| | Posted on Sunday, May 26, 2002 - 10:05 pm: | 
|
i have a galaxy 55 /x-force xt400 whith a 102" whip can u tell me what is the best way to get the most out of it ?105amp alt i think if i went to a 140a alt it would help alot. and what will it swing i have a dozy3001 and it says it is doing around 600-700 is this right |
Tech671
| | Posted on Sunday, May 26, 2002 - 11:27 pm: |
|
Radio 1.5w carrier.
Final coax from amp to antenna 12-15' of Times LMR 240 or similar power handling.
Alternator should be 125a or more.
Reflection should be below 10w.
At least 4ga feed wire for hot and ground.
If your reflection is at 10w or less and you can hold 14v under carrier of 300w, you should be doing about 1kw peak watts. Not every wattmeter will be accurate, so get the reflection down and work on your charging system so you can hold the volts and you will be producing the numbers despite what your wattmeter reads. |
Taz
| | Posted on Tuesday, June 11, 2002 - 11:07 pm: |
|
would love to have a kw in my truck when i get my license |
Buckshot
| | Posted on Saturday, June 22, 2002 - 5:26 pm: |
|
if i change my coax from rg8x to lmr240 will i see any change?or is better to use lmr240 for the long run with the power |
307
| | Posted on Saturday, June 22, 2002 - 6:48 pm: |
|
The Loss at 27 Mhz is very low with both cables. If you are running over 150 feet then yes it will be slightly better.
307 |
Tech671
| | Posted on Saturday, June 22, 2002 - 8:27 pm: |
|
In a 15-18ft run of 8x compared to LMR240 you can see as much as a 50% drop in reflected power. Whether that's velocity factor, shielding, heavier center conductor, or higher power handling ability, I'm not sure. On several installs where ops were running 1kw amps with rg8x, the starting reflect was 2-10w and after changing to the LMR240 typically I see a 50% or more drop in reflect. |
Tech671
| | Posted on Saturday, June 22, 2002 - 8:30 pm: |
|
BTW, LMR240 is rated at 1.1kw continuous, Belden rg8x is rated at 300w continuous. (meaning RMS) |
307
| | Posted on Sunday, June 23, 2002 - 7:47 am: |
|
My Belden book must be wrong , at 15 feet there is a .002 dB difference in loss. That is null and you would never be able to see that. I will call Belden Monday and ask what the deal is..
307 |
Taz
| | Posted on Sunday, June 23, 2002 - 4:45 pm: |
|
Yeah tell those bone heads that I think their coax is good but their written specs su*k! ha |
Tech671
| | Posted on Sunday, June 23, 2002 - 6:16 pm: |
|
Believe me, I won't argue what the mfr specs are by any means....but I can tell you in physical application the reflection went down with the higher grade coax. |
Taz
| | Posted on Sunday, June 23, 2002 - 6:26 pm: |
|
oh yeah i can back you up there no doubt! |
