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connecting RG-213 patch to RG-8U run

Discussion in 'General Technical Questions and Answers' started by DEU1OUMC3, Dec 6, 2018.

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  1. DEU1OUMC3

    DEU1OUMC3 QRZ Member

    the antenna cable i purchased for my discone antenna is 50' DRF-400 RG-8U with male pl259 on each end.

    since i may need to move the antenna around from time to time i would like to have a patch cable of like 10-12' to run thru the 5' mast to discone, and in case any other unforeseen connections i might need to make. and connect the 50' run of RG-8U to that.

    would it be wrong to use a RG-213 PL-259 Patch Cable and connect that to my RG-8U 50' run?
  2. AI3V

    AI3V Ham Member QRZ Page

    That's ok, just be sure to keep water out of the connectors.

  3. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page

    RG-213/U is just the present military standard that replaced the old RG-8/U standard. Since RG-8/U is no longer an actual standard, newly manufactured cable that is marked as "RG-8/U" does not have to meet the old time standard and may not be of the same quality as before. However, cable marked as "RG-8/U" still should have an impedance of about 50-ohms and connecting to RG-213/U cable, which also has an impedance of 50-ohms, presents no problems.

    In fact, you can also connect RG-214/U, RG-58/U or RG-8X cable without any problems. In fact, any 50-ohm coaxial cable can be connected without problems.

    Glen, K9STH
    KU3X likes this.
  4. DEU1OUMC3

    DEU1OUMC3 QRZ Member

    thank you!! got a better understanding now.
  5. WA9SVD

    WA9SVD Ham Member QRZ Page

    You still have to take power into consideration. While RG-8X is usable, RG-58 can have serious problems at higher frequencies and power levels. Since you are using a discone antenna, I will assume you are at the 100 Watt or lower level. At higher power levels, and/or higher frequencies, I would not recommend RG-58 for any but very short jumpers. But any RG-8 "type" can be combined with RG-213/U.
  6. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page

    The truth be known, even for a 50-foot run, at any frequency above 29.7 MHz I would be very hesitant using even RG-213/U and never more than 100-feet.

    For HF, I do use either RG-58/U or RG-8X for short jumpers where the power isn't much more than around the 100-watt level. For the output from my linear amplifiers, and from the antenna switches to the 1/2-inch Heliax that I use for all but my 40-meter phased verticals, I use RG-213/U cable. Also, for short jumpers from Heliax that goes to my VHF and UHF antennas, I also use RG-213/U.

    Glen, K9STH

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