| Author |
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Anonymous
| | Posted on Thursday, August 23, 2001 - 9:09 pm: | 
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EVERYTHING I HAVE IS NEW BEST COAX TRIED ALL JUMPER SIZES,WHEN I KEY UP MY SWR IS 1 WHEN I TALK IT GOES UP TO 3 SOMEONE HELP ME |
bruce
| | Posted on Thursday, August 23, 2001 - 11:15 pm: |
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on the radio side of the amp? is that where you are measuring if so your amp input is not 50 ohms. If you are on the output of the amp are you reseting cal before going to reflected if so maby the output imp of the amp is not 50 ohms and is causing a mis match the only other problem could be rf in the shack ? |
Anonymous
| | Posted on Friday, August 24, 2001 - 1:20 pm: |
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with just the radio on by its self,i have a 0 swr on all channels,with the amp on it is 1.2 when i talk the swr goes past 3,a guy at a radio shop told me a long time ago it should go down when i talk or stay the same. is there something i can do to the amp,it is a klv 350,i heard that there is 1 or to diods that you could take out and replace with some kind of resister heck i dont know. last thing just wondering is there any kind of mods that i can do to this amp? thank you |
bruce
| | Posted on Friday, August 24, 2001 - 2:36 pm: |
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how can you read swr when you are talking? if you are modulating 100% your peak power is 2x your carrer and your meter would show this as a increase in swr unless you are feeding in a tone and reseting the meter then taking the reading. |
Snakedoctor
| | Posted on Saturday, August 25, 2001 - 2:22 am: |
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Just for the record, I think bruce is right. When you modulate a carrier the SWR reading will increase as the forward power rises. Your amp is ok and I don't believe I would worry . |
Skullman
| | Posted on Saturday, August 25, 2001 - 5:18 pm: |
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Ok, first off there is no such thing as a zero swr, swr's represent your radio's power to your antenna's performance, therefore a ratio of 1 to 1 is the perfect match, zero is impossible. Second off, you need to check the SWR's with a good meter, not the one built in radios. Connect the meter between the amp and the antenna. You will have to calibrate the meter with the amp on the desired level of operation, example low= calibrate on low, medium= calibrate on medium, and so forth. Do not speak into the mic when measuring SWR, a dead key works fine. You may see a swing of swr when you speak, this is normal, swr cannot be measured when modulating unless you have a really expensive meter.
Hope this helps.
CEO of DEADMAN INC. |
Anonymous
| | Posted on Saturday, August 25, 2001 - 6:07 pm: |
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well i have a tc 3001 dosy meter,what ever my SWR does not flicker thats how low it is,some people call it zero,some have to get technical.thanks for the help. |
Skullman
| | Posted on Saturday, August 25, 2001 - 7:31 pm: |
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I found this on Wilson's hoepage, maybe it'll help:
The antenna is not the problem. In this case, it is the amplifier. You have already established that the antenna is properly tuned and in good working order with low SWR, except when power is applied. Assume a ham operator is on 10 meters using a solid state amplifier. With the radio only, the SWR is 1.1:1; when the amplifier is turned on, the SWR jumps to 2.0:1. The amplifier is not only transmitting at 28 MHz, but is also transmitting on a second frequency of 56MHz. This is known as a "second harmonic" (2X the fundamental frequency of 28 MHz, transmitting at 56 MHz). Thus the SWR meter is reading both the reflected signal of the normal frequency and the rejected second harmonic signal. The antenna will not accept energy transmitted at 56 MHz, and returns it all back to the radio, which shows up on the meter as high SWR because the meter can not tell the difference between 28 MHz and 56 MHz. In fact, as much as 30% of the power is at 56 MHz. This is generally due to an amplifier that is not adequately filtered. Adding a Low-pass filter at the amplifier output is the only solution. For best results, connect the low pass filter directly to the amplifier using a barrel connector.
DEADMAN INC. |
Sparkplug
| | Posted on Monday, September 10, 2001 - 1:58 am: |
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Filters, Are there any good filters that will keep my signel from going through my neighbors electroincs?I need one that will filter around 700 watts.I live in a subdivision full of duplex homes.If not is there anything else I can besides shutting my power down? |
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