Tag Archives: Tennadyne

Tennadyne and Cubex now under new ownership

Congratulations to Mark K5YAC, Tennadyne and Cubex antennas new owner!

Roger Greenfield WB8NDC had been looking to pass the baton as he and his XYL Nancy wanted to do retirement things.

It is awesome to see the transition completed.

You will be impressed with Mark K5YAC’s background. The http://www.tennadyne.com/about_Roger.htm page has been updated to Mark’s information.  Expect that link to be updates as Mark overhauls the company website.

Tennadyne’s updated phone is (918) 237-0844 and they haven’t posted their new Collinsville, Oklahoma mailing & physical address yet.  Mark’s QRZ page mentions FB and LinkedIn, so he may be putting information there.

73

Steve
K9ZW

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How a Tennadyne T-12HD arrives – prior to unboxing

The Tennadyne T-12HD I ordered is now all here. The boxes are nicely marked.

Mine came in two groups, a first group of five parcels and a follow up parcel with the truss kit.

Continue reading

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Some Assembly Required – Tennadyne T-12HD antenna arrives

Some Assembly Required – Tennadyne T-12HD antenna arrives

Five UPS parcels arrived, two long cardboard tubes, two long boxes and a square box, containing my new Tennadyne T-12 10-30HD Log Periodic antenna.  A sixth parcel with the truss kit is expected to arrive Friday.

This antenna is big enough that it will be a two person assembly job.

I had run a T-8 at my old home QTH, one that I purchased used and after a bit of lightening encounter replaced with a new T-8 a couple years back. That T-8 is going up at my island QTH, hopefully this summer, and is already on the island.

As previously posted, I changed antenna directions dismantling & putting the never installed very large RadioWavz Hexbeam into storage pending technical redesign/upgrades. That RadioWavz has gone radio silent not returning phone calls or emails also factored into my decision.

Having had excellent experience with the decade plus T-8 as my main antenna, another Tennadyne was high on my list to take the main position on the home Skyneedle tower. I’ve cut & pasted the basic claimed specifications:

  • Model    T12.10-30HD
  • Coverage in MHz    10 – 30
  • Boom Length    36 FT
  • Gain/dbd/dbi*    8.0/10.1
  • Longest Element    53 FT
  • Elements    12
  • WT.     115#
  • Turning Radius (ft)    27.6
  • Wind Load (sq.ft)    16.21

Some differences between the T-12HD and the T-8 which interested me:

* The T-12HD should tune 30m, which the smaller T-8 did not do very well at all.
* My Station should have a gain improvement of close to 3dB which is always appreciated for RX and can’t hurt on TX (or would allow running lower power) vs the old T-8 based station, plus any effect for being up another 20ft (6m)
* The T-12HD is a trussed-boom construction vs the untrussed T-8 (not certain if that is ultimately good or bad)

Here is a picture taken from the Tennadyne website of a T-12 (presume standard vs my new HD model) at another ham’s station:

Tennadyne T-12 (Tennadyne’s website photo)

There are some integration advantages for a LPDA (Log Periodic Dipole Array) antenna when running a Flex-6000 based station, as the LPDA tends to present an acceptable SWR to the radio or if running QRO the PGXL amp, when used within the LPDA’s design frequencies. Typically the ham band optimization matches other ham designs while respectively the non-ham band lower performance you would see from other non-actively tuned beam antenna designs is avoided or minimized.

I found both barefoot and running QRO with the T-8 was basically a no-tuner required situation, one that I hope the T-12HD matches.

Link to Tennadyne antennas: http://www.tennadyne.com

73

Steve
K9ZW

[Edited on 15JAN21 to correct formatting and photo insertion problems with original posting, and capture that mine is arriving in six parcels rather than five parcels]

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Spring Antenna Service

This winter and early spring have not been kind to outdoor equipment.

This weekend finally the weather broke and it has been nice enough to spend some time on the antennas.

Original plan was to do a lower, inspect, service & repair in a few weeks, but some obvious impact from exceptionally high winds has made it prudent to start now.

The two log periodics are on the same mast, and winds have tweaked the larger (T-8 10-20m) about 5-10 degrees from the upper smaller (T-28 1.3ghz-6m) most likely by slipping the larger boom.

My T-8 predates the “Slipp-Not” brackets that Tennadyne offers and a set will be on order (I make pick it up at Dayton).  This should reduce the chance of one antenna slipping in relation to the other.  Beam Width coverage is wide enough the little tweak is more an offense to me than it is to performance, so it may wait until the next lowering.

My Tri-Ex/Tasjian Tower has feedline stand-offs that I user large UV resistant o-rings as the cable retainers in the forked ends of the stand-offs.

Wind and time took out the second from top o-ring and the wild winds caused the feedline to be hooked about the clamp.  It is amazing to think how wild of wilds would be needed to raise that much triple-coax-feedlines-plus-rotor cable around enough to whip it about – must have been a monster wind.

The cable is not hugely at risk, but it would be better to get it back in place.  Again I will have to decide if I deal with it now or in a few weeks.

When the tower is lowered and tilted over I use a set of scaffold I bought from work – a handful of rings from a manufacturer long out of business that don’t connect with any other brand (not that you should).  Useless for work but just what I needed and makes an ultra safe work platform.

WHen it comes down next the coax seals will all be inspected and renewed as needed, each cable gets a visual and wipe down, plus gets a check with the TDR for any electrical problems.

I have upgraded lightning protection that will get installed.

A decision to be made is whether to swap out the rotor (a Ham-IV) for a freshly overhauled Ham-IV or whether to leave well enough alone.  Plan was to swap in the fresh overhaul and then have the long serving unit overhauled as the spare.

Decisions will hing on whether I can disengage the displaced cables for now (I lower the mast but haven’t tipped it over yet) or whether I need to hand crank the tip-over now.

It is also time to get the buried feedline in to do a second HF antenna on most bands.  Originally I was going to make the vertical just another setting on the remote antenna switch, but I am now thinking it should be on the second feedline to the shack so two can be used at the same time.  The Flex-5000A could use the dual antennas now and the Flex-6700 will take the diversity capability to a new level if I get my antennas sorted out correctly.

At least it is warmer out once I figure out the plan!

73

Steve
K9ZW

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