Re: [Repeater-Builder] Duplexer Loss Question

[Brent]

Hmm  I just  hooked up a set of cans over here, and  they were tuned for my freq used them b4 well 2 year a ago.. and I tested the antenna with 75watts direct from a radio and bird inline nothing else..   hooked up the duplexer and repeater (75w) and check the SWR was a crankin + 5: so I checked the antenna again with the repeaters transmitter direct to the ant and it is 1.3:1 from 75-100w   must be the im proper tuning, time for the r2600 to come out and play and tell me where the things are tuned at I hope. Brent     ----- Original Message ----- From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Tuesday, March 22, 2005 10:22 PM Subject: Re: [Repeater-Builder] Duplexer Loss Question Check your transmitter for spurious signals... much of your power might not be on the freq. you think it is...Also check the reflected power at the TX port, this can be an indication if the cavities are tuned correctly.  lance ----- Original Message ----- From: Mathew Quaife To: Repeater-Builder@yahoogroups.com Sent: Tuesday, March 22, 2005 9:58 PM Subject: Re: [Repeater-Builder] Duplexer Loss Question Thanks Mike, well I wanted to make sure that I was not loosing the ability to do basic math, but for some reason I had the duplexers retuned and whenI dumped 200 watts into them, I got only 65 to 70 back out of them.  Trying to figure what when wrong in the process.   Mathew Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote: At 10:59 AM 3/22/05, you wrote: >I am curious with a set of TX-RX duplexers at 1.5 insertion loss, >input power of 150 watts, what would be the power output? Need to >know, as I don't think they are tuned correctly, or something might >be wrong here. > >Mathew See From that table 1.5 is 29.2%, so 150 times 0.292 = 43.8 150 less 43.8=106.2 watts A few numbers worth remembering: 1db is about 20% 1.5db is about 30% (actually 30% is halfway between 1.5 and 1.6) 3db is about 50% 6db is about 75% 10db is 90% 20db is about 99% All of the above numbers are close enough for field work, especially when you factor in feedline and connector loss. And 3db is double the power 10db is 10 times the power 20db is 100 times the power. The big think is that you hear the Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ Do you Yahoo!? Yahoo! Mail - 250MB free storage. Do more. Manage less. No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 3/18/2005 Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/   To unsubscribe from this group, send an email to: [EMAIL PROTECTED]   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

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