ARRL

AK4NX

Joined: Wed, Oct 26th 2011, 13:58 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Need Help With Coax Choice Nov 10th 2011, 13:18 4 1,256 on 23/1/12
Callsign change didn't happen? Nov 2nd 2011, 08:30 2 1,134 on 2/11/11

Latest Posts

Topic Author Posted On
Need Help With Coax Choice AK4NX on 10/11/11
Hi Zack,
Thanks for the quick reply. Going to use an MFJ-1775 Multi-Band Rotatable Dipole, a Yaesu FC-902 Antenna Tuner, with a Yaesu FT-902DM transmitter. Using this combination of equipment which coax would you recommend for me?
John
AK4NX
Quote by W1VT

Hi John,

If you are using an antenna with a low SWR, like a 10M dipole cut to length, RG-58 will work just fine. But, if you want to use a tuner to operate the antenna on bands where there is a significant impedance mismatch, a lower loss cable can result in much better results on transmit. For instance, feeding a 10M dipole on 20M results in a whopping 20 dB of loss--going to RG-8X improves signals by 2dB. Going to low loss LMR-400/9913 improves signals by 6dB. One can do even better by hiding an automatic tuner next to the antenna feedpoint.

Zack Lau W1VT
ARRL Senior Lab Engineer
Need Help With Coax Choice AK4NX on 10/11/11
Hello,
Newbie to HAM, and my question concerns the correct choice of Coax cable. I'm going to run a 'stealth antenna' from my porch to an MFJ window pass-through a distance of no more than eighteen feet.
Then a piece three feet to my antenna tuner. Would I be better of with RG-58 or RG-8X coax? I'm going to purchase the length needed with PL-259s attached and understand they are already pre-measured.
Thanks,
John
AK4NX
Callsign change didn't happen? AK4NX on 2/11/11
UPDATE....problem solved by Perry Green wy1o at VEC. Thank you Perry for the quick attention to my query.
John
AK4NX (ex: KK4EJX)
Callsign change didn't happen? AK4NX on 2/11/11
I upgraded my amateur license on October 19, 2011 from General to Extra Class. I checked the appropriate box and initialed same to change/upgrade my Callsign as instructed by the VEs administering the exam.

The upgrade to Extra Class was completed and granted with new license received from FCC; but my Callsign was not changed to a 2x2 to reflect my Extra Class license upgrade as requested. I would like to know why the change did not happen?
Thanks,
John
KK4EJX

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