REPOST – Fishbone Aluminum Wedges – Tennadyne Log Periodic Anntenas in Action

When faced with the decisions on what antennas to install I had a number of things to weigh up:

  • Cost was a consideration
  • Directionality a strong desire
  • Gain a consideration
  • QRO (Higher Power) Capability desired
  • and the big issue – boom & swinging radius a concern
  • The recommendations I was soliciting from other Amateurs led to a wonderful short list of possible antennas, but simple availability first led me to consider the Tennadyne Log Periodic Antenna .

    One of our club retired members had become infirm and wanted someone to buy & take down his antenna & tower. This fellow has a past history of Elmering me in his profession when I was just out of high school, and I made him an offer & worked the deal out of respect for him. I figured I could help him out and either use or trade the tower & antenna for part of what I wanted.

    In the deal I ended up with his year old Tennadyne T-8.

    The short list of antennas I had was huge. I had been offered a very large Mosley 96x but found that it would swing off my property due to tower location.

    With this antenna & that antenna being set aside as too expensive, too big, too long of a wait or for concerns over performance, the research on the Tennadyne T-8 lead to my determination to put it up and see how it works!

    Wanting to have a directional 2m/440cm antenna, I purchased a Tennadyne T-28 (Original Model) which is a 6m to 1.3gHz Log Periodic, and stacked it 11 ft above the T-8.

    Here is the installation (before cables were installed):

    Stacked Logs at K9ZW

    To date I’ve worked 98% of the time with the T-8. I’ve found it’s performance to be much better than I had imagined. Side and back singal rejection is impressive, allowing my listening to focus in the direction the antenna is pointed.

    The measured Standing Wave Ratio (SWR) is 1:1.25 or better across the T-8’s advertised range of 20m to 10m.

    Received signal reports have been excellent, with how many dB over 5-9 usually the only number that changes by the QSO!!

    Listening is exceptional in the direction of the antenna’s focus, though of course it is not Omni Directional in listening. In some situations the T-8 may be well suited to being paired with a “listening antenna”.

    The little bit of experimentation I’ve done with the T-28 has shown great promise for this smaller log periodic, and I am looking forward to putting it to the test down the log.

    It goes without saying that I would highly recommend the T-8. Simple, cost effective, Mil-Spec style build, and great performance make it an antenna worth looking at!

    73

    Steve
    K9ZW

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    One thought on “REPOST – Fishbone Aluminum Wedges – Tennadyne Log Periodic Anntenas in Action

    1. The Tennadyne T10 Log Periodic Antenna – Part 1

      Having moved to a new QTH in January 2000 with more space, I obtained planning permission for a 59ft/18m tiltover tower, 10ft/3m long stub mast and two multi-element antennas with a maximum boom length of 26ft/8m.

      My main interest in the hobby is working DX on CW, SSB and RTTY on all HF bands, and 50 Mhz. I toyed with idea of purchasing a Cushcraft X7 for 10/15/20m and then stacking it with a Cushcraft A3WS for 12/17m above it. These two antennae are very popular amongst DXers and have been well written up previously. To also stack a 6m yagi on the 3m stub mast was stretching things just that bit too far for my rotator and would have created further chances of interaction between antennas which would mean reduced performance from all three. After a costing exercise on the X7/A3WS, which came out at £853, I did a similar exercise costing a USA made Tennadyne T10 Log periodic. The cost was in US Dollars and had to include UPS airfreight from the manufacturer in Texas, and customs import charges of 24%. At an exchange rate prevailing in June 2000 of $1.48 to the pound, the grand total came to £813.

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