[Hallicrafters] 40 m antenna used on 80 m - what to expect?

[Bob Macklin]

I believe a Pi Network output drives a LoZ antenna better than a T network tuner. 

Heath made a simple L network tuner to use with short antennas. It's basically a series loading coil just like the roller inductors in the ARC-5 transmitters.

Do some research on how to make mobile antennas work on 160M and 80M.

Bob Macklin
K5MYJ
Kent (Seattle), Wa,
"Real Radios Glow in the Dark"

  ----- Original Message ----- 
  From: Bill Marx 
  To: Hallicrafters at mailman.qth.net 
  Sent: Thursday, October 02, 2008 3:55 PM
  Subject: Re: [Hallicrafters] 40 m antenna used on 80 m - what to expect?


  The "Pi-Network" always seemed to cure everything and make it radiate back then...
  Bill Marx W2CQ

    ----- Original Message ----- 
    From: Oliver J. Dragon 
    To: Waldo Magnuson ; Hallicrafters at mailman.qth.net 
    Cc: Waldo Magnuson 
    Sent: Thursday, October 02, 2008 6:37 PM
    Subject: Re: [Hallicrafters] 40 m antenna used on 80 m - what to expect?


    Skip,

    Sometimes ignorance is bliss. (my ignorance, in this case).

    Upon receiving my Novice class ticket in 1960 I immediately put up a 40M dipole about 25' off the ground and fed 
    it with 70' or so of RG-59 directly to the pi-net output of my just completed Knight Kit 50 watt transmitter. 
    I had two 40M crystals & had a great time. The SX-99 was connected to an 80' #12 copperclad longwire (the wire still 
    had the 'set' and coiled back up close to original shape when I took it down 9 years later). Didn't have to worry 
    about an antenna change-over relay - just turned down the RF gain on the SX-99 when transmitting. 
    Of course, both antennas were erected during a snowstorm - can you think of a better time?

    Anyway, after about 3 weeks on the air I got the bright idea that 80M could be real fun, so I went over to 
    Harrison Radio (225 Greenwich St., in Manhattan and picked up two 80M xtals & proceeded to run the Knight straight
    into the 40M dipole on 80M. No problem. Didn't know what the swr was (no swr meter); didn't know how many of the 35 or so input watts
    showed up at the antenna (no wattmeter) but I worked up & down the east coast from NY; out to the midwest (Chicago, Detroit, St. Louis). 
    Had more fun on 80 than on 40. Less qrm andmore slow-speed guys to chat with. 

    Only problem was with harmonics. My 3704kc xtal doubled to 7408kc and careless dipping one day to the harmonic
    earned me a 'special official reception report' from the FCC. Solved that by more careful tuning and a harmonic trap courtesy 
    of QST.

    Bottom line - give the 40M dipole a try on 80 and you might be surprised. Have fun.

    73
    Ollie

    At 09:14 PM 10/1/2008, Waldo Magnuson wrote:

      I have a 40 m dipole horizontal antenna and would like to try transmitting (HT-44) on 80 m.  What should I expect?  I have a Ten-Tec 229 antenna tuner and may be able to match - suggestions (helpful) would be appreciated.  Thanks.
      73,  Skip  W7WGM

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