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KB1DTB

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About KB1DTB

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    RC-Cam Visitor

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    CT
  1. KB1DTB

    Video mux

    Kilrah, I have received the mux for this project but still need to make the board and get other parts. Have there been any updates to the program or schematic? I also need the program that is burned into the pic. Thanks
  2. KB1DTB

    Video mux

    joekadet, Thanks, I'll check it out.
  3. KB1DTB

    Video mux

    Kilrah, That looks like what I need and within my soldering limits but I don't have pic programming capability yet.
  4. KB1DTB

    Video mux

    I recall someone making a video mux kit but can't find the link. I was going to switch the power to the cameras only but then realized the delay of power up. Does anyone know the link for the mux? Thanks
  5. KB1DTB

    GP Patch antenna polarity?

    Here are a couple of sites. If you scroll down the first it will show the PC Electronics turnstile. The RG59 cable I have found has a Vf of .82 not .66 as in this drawing, in the drawing it scales with .66. http://www.hamtv.com/pdf.files/Rocket.pdf http://www.applet.cz/~ulcak/crossed_dipoles_ant.htm Thanks Val. Brian
  6. KB1DTB

    GP Patch antenna polarity?

    That would be great! You guys here have so much more experience in this field. I am very greatful for any and all help. I need to know if the total length of each dipole is 1/2 lamda or do you add the space between the two 1/4 wave poles to the overall dimension or subtract it from the length of the 1/4wave poles so the overall length would be exactly 1/2 lamda. Did that make any sense? Thanks Mr. RC CAM
  7. KB1DTB

    GP Patch antenna polarity?

    Thank you for the replies. I will be making one of your GPP for the receiver and one turnstile for the transmitter. I was trying to calculate the turnstile size based on frequency length for 910mhz but the dimensions do not match the PC Electronics website if calculated out. Should I scale everything up from the PC Electronics website or go by the calculated sizes? Did they adjust the sizes based on response? I understand the velocity factor now. If it takes longer for the wave to travel thru the coax you need to shorten the coax based on the Vf so it's length will equal the lambda in free air. Thanks, Brian
  8. KB1DTB

    GP Patch antenna polarity?

    Hello mister RC Cam, Do you know the beam width? I have seen some commercial patch units listed as dual linear. How do they do that?
  9. Does anyone know the polarity of the GPP? Thanks
  10. KB1DTB

    New receivers appear to have RSSI

    Getting back to the diversity system, Do you plan to switch antennas during the vertical sync? Is there a way to choose the cleanest signal vs. the strongest signal? I have read of some systems comparing the video output signals of the receivers for determining the best signal to use vs. the received signal strength.
  11. KB1DTB

    New receivers appear to have RSSI

    Didn't get out to fly the 900mhz system, too cold for my video recorder to work properly. I did get to check the current draw of the new amp, 530ma.
  12. Hello All, I have a basic understanding of electronics and would like to get deeper involved. I am looking for advice as to what equipment would be the minimum to troubleshoot A/V equipment, scope, LC meter, bird 43, signal generator, frequency counter, etc?. I would like to get a better understanding of the equipment we use for aerial video and someday be able to understand more of the UAV GPS setups. Thanks, Brian
  13. KB1DTB

    New receivers appear to have RSSI

    They said they do buy from Lawmate like you, but that the transmitter is made in a sister factory. The unit works with all four channels on the receiver. The receiver for the 1.2 system just went out, it acted like a bad video connection where if you moved the connector the signal would go in and out. I took it apart but found no bad solder joints. I took the can apart and found that the unit is PLL capable with a Zarlink SL1461SA but it's upper range was designed for 800mhz.
  14. KB1DTB

    New receivers appear to have RSSI

    Bill, The tin foil and a ground strap may be in my future . Yes I am using the new receiver with the full one watt transmitter as advertized by Microtek. I just got a call from Microtek and they said to keep them posted and will make good if it doesn't work out. It may be possible that the manufacturer sent out the wrong type of receivers even though they were purchased at the same time. It does receive but may have a pre/de-emphasis issue. I need to double check everything. The Microtek folks are very nice to deal with as I'm sure are you. I will be going out to the field tomorrow for more testing, it should be up to 20 degrees from the 6*F now.
  15. KB1DTB

    New receivers appear to have RSSI

    Hello Bill, I set up both systems with the receivers 5 feet apart, the transmitters 1 foot apart with a transmit distance of 100'. Both receivers were elevated 7' off the ground. I powered each system one at a time and compared received signal quality. The 900mhz system had color blooming, and a snowy affect in some portions of the picture while the 1.2ghz was clean. The 900mhz seemed to be much more sensitive to multi path I think. As I moved around the receivers the picture would get better or worse with the 900mhz but it had no effect on the 1.2ghz. I am the guy that can walk by a portable fm radio and it will change received stations. What's up with that? I am going to take them both out to the flying field to get a better feel for what is going on. Brian
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