| Author |
Message |
    
Jyd
Advanced Member
Username: Jyd
Post Number: 580
Registered: 11-2001
| | Posted on Tuesday, February 05, 2008 - 11:41 am: | 
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i have my cobra 2000gtl set to a 4watt dead key and i use a jo gunn antenna,the swr is 1.2 it rises as i talk.then when my rci2990 is hooked up to it 20 watt dead key and swr is over 2.i also can raise the power on my 2000 to a 8 watt dead key which also shows a higher swr.kinda lost,the antenna is new coax is lmr400. should i raise the power on the 2000 then adjust for low swr.by the way i have had a imax 2000 and a a99 and others jo gunn is far supeior then those. also seems like i get more feedback got to keep the mic gain down on the 2990 |
Bruce
Senior Member
Username: Bruce
Post Number: 4604
Registered: 9-2003
| | Posted on Tuesday, February 05, 2008 - 8:02 pm: |
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Are you seting the meter cal for full scale at max power then reading SWR ?
Every time you change power out you must reset the cal for full scale
On 6 since 66
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Jyd
Advanced Member
Username: Jyd
Post Number: 582
Registered: 11-2001
| | Posted on Tuesday, February 05, 2008 - 9:15 pm: |
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yes, i reset it each time. when i check the swr on the radios without the dosy meter and use the radios swr meter it is lower.why would a dosy meter do that? the 2990 shows 1.1 on its swr meter with high power turned up,but the dosy shows higher swr when the power is raise.maybe that is why the guy sold it to me? so i have 2 radios reading the same thing and the dosy swr gets higher with the power turned up.squeals with the dosy meter hooked up and does not when out of line.sounds like a ground problem.but i know nothing about meters. |
Bruce
Senior Member
Username: Bruce
Post Number: 4605
Registered: 9-2003
| | Posted on Wednesday, February 06, 2008 - 6:44 am: |
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Try this use a dummy load and see if the swr changes into it.
On 6 since 66
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Tech237
Moderator
Username: Tech237
Post Number: 958
Registered: 4-2004
| | Posted on Wednesday, February 06, 2008 - 7:20 pm: |
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How about the DOSY meter may be more accurate than the inbuilt one.. Also check the patch cable your using bewteen it may be faulty.
Simon
Tech237
N7AUS
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Jyd
Advanced Member
Username: Jyd
Post Number: 583
Registered: 11-2001
| | Posted on Thursday, February 07, 2008 - 9:59 pm: |
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dumb me, iforgot to seal the gamma match. it had a half a ounce of water in it. |
