Coax Loss vs Connector Loss

Discussion in 'Amateur Radio News' started by VK6FLAB, Mar 15, 2018.

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  1. W0MPM

    W0MPM Premium Subscriber QRZ Page

    please educate me about the silver plated BNC. Don't have any but if some came up for cheap I would have thought I was doing 'a Good Thing'.

  2. WD0BCT

    WD0BCT Premium Subscriber QRZ Page

    Some of the modern QRP rigs use the RCA jack for an antenna They claim because it is compact and light...I think the real reason is CHEAP.
    KK5R and KM1H like this.
  3. K7JEM

    K7JEM Ham Member QRZ Page

    Yes, but is also works very well, and is very small. Really not a bad connector for many RF uses.
    KK5R likes this.
  4. KM1H

    KM1H Ham Member QRZ Page

    The most common tarnish found in a residence is silver sulfate which is a partial insulator.

    KK5R likes this.
  5. KM1H

    KM1H Ham Member QRZ Page

    As long as you carry a bit of DeOxit D-100 with you.

  6. KK5R

    KK5R Ham Member QRZ Page

    The BNC connector can also be a type that is mounted on a PC board and not bolted on the panel. This means more compactness and no wires floating around inside the box. And you are right, they are probably cheaper since they make so many of them and sell in bulk which also means they are cheaper to transport by being lighter the the SO-239's.
  7. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Collins used RCA phono receptacles (pretty good ones with ceramic insulators) on the S-line.

    Motorola used something very similar but with a slightly shorter pin all over the place on VHF/UHF LMR equipment for decades.

    Not because they're cheap.
  8. KK5R

    KK5R Ham Member QRZ Page

    Many plating types also protect the metal from oxidation. Like gun bluing, for example, which is nickel oxide.

    At one time, some finger contacts were intentionally plated with a thin layer of silver so the oxide can be limited and when the connectors are mated, the finger contact wipes off the oxide allowing a good metal-to-metal contact. At one time, this was common with IC leads. However, technology changes so you don't see this kind of plating, anymore.
    Last edited: Mar 22, 2018
    W1YW likes this.
  9. KM1H

    KM1H Ham Member QRZ Page

    I see that here on several surplus UHF cavity amps, especially built for the military or federal agency such as the FAA such as at AM/6154 and 6155 dating into the 60-70's.

    I dont know what is used for Eimac finger stock on my 3CX1000A7 2M amp and 8877 for 222 MHz.

  10. KK5R

    KK5R Ham Member QRZ Page

    There are many alloys but at one time, many finger stock was composed of Beryllium Copper. It is a good conductor and has inherent springiness so a good contact is better guaranteed. The same as used as the finger contact with UHF front ends cover/caps on the little converter. There are also some of the same looking finger stock used on some PC board components today. But, whether Beryllium Copper or similar alloy is unknown to me. The is at the core of metallurgy.

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