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  1. prcguy

    I need help on what to get, Either Thales Liberty, or Unification G5.

    The Thales Liberty is end of life and there are no new batteries anywhere on the planet to be had. I actually got one in perfect shape with the side adapter that can use a USB cable for programming for $100. I was shocked when it arrived and worked fine. I could not find anyone to sell me...
  2. prcguy

    UHF-TV repacking and PS TRS Interference

    I'm told in So Cal the Los Angeles County Sheriff's T-band radio system is getting interference directly from a distant TV transmitter and not from occasional tropo propagation.
  3. prcguy

    Rate / Critique My Antenna Setup Please

    The PAR SW End Fed up in the clear is a great all around SWL antenna and I would recommend something like that. Its also best to keep the hot antenna wire away from the house whenever possible to minimize RFI pickup from things inside the house. Sometimes RFI can travel on ground conductors so...
  4. prcguy

    High SWR- Help!

    Sounds like the antenna(s) are a little long for 467MHz and just about right for 448MHz. I would trim them a little at a time to balance the SWR between the two extreme freqs and you may get around 1.5:1 on both amateur and GMRS when your done. Otherwise I agree a 2:1 match is not terrible and...
  5. prcguy

    Rate / Critique My Antenna Setup Please

    I think the OP would benefit most from a 9:1 transformer outside and run 50 ohm RG-58 type coax to the radio via an 1/8" plug. You don't want to just connect a bunch of wire to coax and bring it in as the impedance will be swinging from one extreme to the other over the SWL bands causing extra...
  6. prcguy

    Quick grounding question

    Yes burying it is better for dissipating energy to ground for the whole system, especially if its bare wire. I didn't read in the response that burying was recommended, just not to put it in conduit, which would be required if its exposed.
  7. prcguy

    Quick grounding question

    Generally the NEC requires primary ground wires as described by WA0CBW in post #6 that are accessible to people, to be run inside a conduit that is also grounded. Every ground wire from the AC electrical panel on a house or commercial building to the ground rod I have seen is run inside flex...
  8. prcguy

    Motorola Quantar Repeater Controller!

    I did a search on Quantar several times a day and it popped up with a buy it now for $600 including shipping. The same seller had some spare modules and I sent him a note asking if he would toss in a receiver module to push me over the edge to buy it. He did so I did. Stroke of luck and good...
  9. prcguy

    I Bought The CMC 130-3K....

    I probably recommended the MyAntennas CMC but I also remember mentioning its a good idea to borrow or steal one for testing before buying due to everyone's different setup. I have several here I would be happy to loan to locals, or I would have been happy to ship one to ridgescan to see how it...
  10. prcguy

    Motorola Quantar Repeater Controller!

    Apparently you didn't see the 110w range 2 UHF Quantar I just got on Ebay and it came with a spare receiver shipped for $600. Its humming away right now in my garage.
  11. prcguy

    Motorola Quantar Repeater Controller!

    You can ship a few Quantars here for storage, I will take good care of them!
  12. prcguy

    How Is Powering An LNA Best Accomplished?

    It is an odd antenna but its real and many of them were deployed in South East Asia in the late 1960s and 70s. Its directional off one edge and if you look closely at the picture of it assembled on the ground there will be an arrow pointing in the direction of max radiation. To point it straight...
  13. prcguy

    Motorola Quantar Repeater Controller!

    There is one catch with that and I experienced it and verified with the mfr. If you make a channel that is P25 only then the repeater is not capable of demodulating audio and sending it back to the controller for DTMF decode. The repeater will be stuck on that channel and you would have to put...
  14. prcguy

    How Is Powering An LNA Best Accomplished?

    Are you going to be receiving TV signals? If so with the antenna horizontal? Here is an interesting antenna and I had one for awhile but gave it to a friend because I didn't need a directional antenna in the 30 to 76Mhz range. I believe its got around 4.5dB gain and its a wire log periodic that...
  15. prcguy

    How Is Powering An LNA Best Accomplished?

    One of the best known preamps for repeater front end use was Angle Linear, and I've had the owner of Angle Linear (Chip) sit me down and explain the do's and don'ts of using his or any preamp and how easy it is to generate IMD in even the highest level version that Angle Linear made and it was...
  16. prcguy

    Motorola Quantar Repeater Controller!

    I just discovered and purchased a tiny repeater controller for Quantars that plugs into the 50 pin back plane connector and gives you all kinds of remote control features like repeater disable, change channels, courtesy beeps, etc. It also uses the original repeat audio path inside the repeater...
  17. prcguy

    How Is Powering An LNA Best Accomplished?

    Always put the filter before the preamp, never put the preamp before the filter. The only exception to this is if you are not going to connect an atnena to the preamp and filter like on a test bench for sweeping or testing. Or you need to generate some IMD to play with. The statements about...
  18. prcguy

    PL-259 connectors.

    What's not to love?
  19. prcguy

    Seeking Feedback on Rail Band Reception Improvement Options

    Using an actual railroad transceiver like a Clean Cab Spectra or high end commercial radio should not require any filtering to keep out NOAA weather or anything else, just hook it up and enjoy beautiful reception.
  20. prcguy

    How Is Powering An LNA Best Accomplished?

    It looks like that filter has over 2dB insertion loss everywhere, not including the FM band attenuation. If you changed any parts you would need a way to sweep it to see the results.
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