| Author |
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Garagedude
| | Posted on Friday, November 14, 2003 - 7:32 pm: | 
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I just hooked up my new DX-77, receive seems to work great but when I key up the radio makes a clicking noice (only when Echo is on) and I've not been able to get anyone to hear me. Radio has been modified for cb use and I was on 19. Any ideas would be great. |
Bruce
| | Posted on Friday, November 14, 2003 - 9:26 pm: |
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this may be dumb but are you getting any kind output and do the lights dim???? |
Garagedude
| | Posted on Friday, November 14, 2003 - 10:28 pm: |
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My Bad...After cking with an ohm meter, my antenna was dead, so the DX-77 is working fine with a new antenna. |
Bruce
| | Posted on Friday, November 14, 2003 - 11:32 pm: |
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Garage .....
Back in the early 70's I was on 50.110 USB ( 6 meters ) and the band was HOT ...... everyone was +40 or more....except one guy who at S6 i could just hear well i pulled him out long enough to get his call and told him he was S6 while the others were +40! Next transmission he was +60 PINNING my "S" meter. Gosh what did you do? He came back makes a diffrence don't it transmitting on the BEAM Antenna instead of the DUMMY antenna!
It has happend to all of us glad your radio if fine Bruce |
Mr_Rf
| | Posted on Saturday, November 15, 2003 - 2:09 pm: |
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Bruce and others...Lesson 103...Dummy Loads radiate!
One of my neighbors (abt. 3 miles down the road) got his tech license back in the mid 80's. I recognized his voice on 40 meters with an s7 signal one afternoon saying hello and counting to five. So I called him on the telephone and asked him if he knew he was on 40 meter phone band. He paused, then said "how can you hear me...I'm on my dummy load"? LOL
He had a TS830S, cantenna, and a 50 ft spool of RG-58 beside his desk!!! He learned that day that dummy loads and coax radiate, just not as efficient as an antenna! |
Bruce
| | Posted on Sunday, November 16, 2003 - 12:02 pm: |
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Mr RF that was a 1300 mile contact at s6 yep they DO radate. |
Ss8541
| | Posted on Monday, November 17, 2003 - 12:37 am: |
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since the main problem here has been solved, and a second subtopic started, hopefully no one will mind if i throw my 2 cents in about d.loads and give my experiences with them.
yes dummyloads do radiate. i am located in a shopping center. on the same wall my bench is on is a stereo for the clothing store that i share that wall with(stereo is on their side). if i am testing some 'high power' equipment into a dummyload it still comes through their stereo and customers look around like they are hearing the voice of god or a madman whistling(depending on if i am talking or whistling). at least this is how the manager at that store describes their reactions. thank goodness she is easy to get along with and thinks it is funny.
the county tower is only a 1/2 mile from my location. when we are testing fire/police mobile(walkies aren't as bad)radios we key the tower almost everytime we key the radio into any dummyload(including the ones in the service monitors). so we have to test those on the talk around(simplex) ch's.
the amount of radiation from d.loads also depends on what type of dummyload you are using. the 'cantenna' type and others that are completely sealed do not radiate much at all. i use a 1000w mfj that has excellent swr up to 650mhz for testing high power devices since the service monitors can not handle it. the enclosure is perforated to help it cool faster, but this leaves the resistor open to let radiation escape. i bought it for the factor of cost and swr performance(especailly at uhf freqs) it was much cheaper to modify it with some very small fans to make it a 'continuous duty' d.load than to buy the expensive 'commercial' d.loads. we were able to buy and modify 2(1 for the installation guys) of the mfj's for way less than the price of 1 commercial d.load.
for this type of d.load, you can do what i plan to do and build a 2nd metal enclosure that is completely sealed to aid with the radiation leaking out. notice i said plan to do, i haven't done it yet. |
Bruce
| | Posted on Monday, November 17, 2003 - 8:03 am: |
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8541
Know this problem well .... when i worked for the st. pete (pd/city ) radio shop like you we were only a half mile from the 300 foot tower and even into a comercal dummy load the coax leakage was enough to trip the repeater. The guy i told the 6 meter story about was using a cantenna and rg-58 coax was about 1/4 wave and probly was where he got raditaion from. I like the one mfj i have for little money it does well. Now years ago i had several cantennas but when we moved they went into the trash even filled with oil were rusting out. |
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