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Reviews Categories | Antennas: HF Verticals and Wire | TENNADYNE TD-90 Help


Reviews Summary for TENNADYNE TD-90
Reviews: 3 Average rating: 4.7/5 MSRP: $$250
Description: A BROADBAND TERMINATED FOLDED DIPOLE 90 FEET LONG
RATED FOR 500 WATTS PEP FROM 1.8-30 MHZ.
Product is in production.
More info: http://www.tennadyne.com/td_line.htm
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KQ1Y Rating: 5/5 Jul 14, 2012 05:34 Send this review to a friend
Great for Emcomm  Time owned: 0 to 3 months
I used it for the first time a month ago during a regional MARS exercise - easy to install (on a 30' surplus mast in an inverted V configuration).

Amazing tuning across the bands which in our frequency-agile (2-20MHz) environment was a tremendous help. Starting running with the tuner but ended up taking tuner out of the circuit as was not needed and was causing more problems.

Since purchased my own - so far performance is up there, though won't beat a permanent 600' horizontal loop antenna, for what it is good at - its really good. I have a 160ft Cobra and would say its antenna performance is marginally better, operationally much better as it tunes up everywhere. The Cobra won't get on 160m or 3MHz frequencies very well.

A highlight for me - during the exercise at night when we had some downtime, managed to work New Zealand on 17m - not bad for 100W portable operation.
 
W4LTX Rating: 4/5 Jul 7, 2009 10:44 Send this review to a friend
Better than B & W  Time owned: 0 to 3 months
I replaced a B & W broadband dipole with the TD-90 a little over a week ago. It is better than the B & W on all frequencies but did not make the low SWR specifications called for. In all fairness I do not have the option of installing the antenna by itself clear of all buildings and other antennas.

A brief comparison:
160 meters; SWR 1.7:1 where the B & W did not work at all.
3.5 - 5.5 MHz (including MARS and CAP frequencies); SWR equal or below 1.3:1; B & W 1.5:1
40 & 30 meters; SWR 3:1; B & W 4:1
20 - 12 meters; SWR 1.5:1 or better; B & W also 1.5:1 or better.
10 meters; varied from 3:1 on the low end to 1.3:1 on the high end of this band. The B & W was not checked on this band.

Performance was equal to Alpha Delta DX-CC on 80 and 40 meters but the TD-90 was quieter on receive. On 20, 15, and 10 the DX-CC was 1-2 S units better.

The TD-90 intersects the DX-CC antenna. Center is 30 feet high and the ends about 12 feet high. Construction seems better than the B & W. I feed the antenna via an autotuner.
73's, Pudge, W4LTX
 
W5BIV Rating: 5/5 Apr 27, 2009 07:01 Send this review to a friend
Outstanding antenna  Time owned: 3 to 6 months
I have been using the TENNADYNE® TD-90 terminated folded dipole for four months. It is a broadband antenna designed for fixed station, multi-frequency applications. This type of antenna is widely used by military, marine, commercial and broadcasting services. The antenna can be mounted horizontally between two support masts or structures, or as an inverted ‘V’ using a single central support mast, which is the configuration that I am using.
I have been very impressed with the construction of the TD-90. The antenna is made with extremely durable stranded copper clad steel and is pretuned so that no measuring or cutting is necessary. The components are also heavy duty construction. To date, it has easily withstood 65 mph winds.
I found it very easy to install and the performance has exceeded my expectations. The benefits of operating with a broadband antenna are numerous, particularly if you operate in a remote controlled configuration. Although the antenna is rated from 1.8 to 30 MHz, I found that it also loads well on 6 meters.
My initial concern with this antenna design was the anticipated loss of power in the terminating resistor, but that concern has been unfounded. The TD-90 is rated for 500 watts PEP and I routinely operate at that power level with little apparent heating of the terminating resistor.
I performed many on-air comparisons with the TD-90, resonant half wave inverted ”V”s, and a GAP Challenger vertical. Most stations could not detect any difference between the TD-90 and the resonant dipoles. The comparison with the vertical varied with the propagation angle, as would be expected. Another advantage of the TD-90 is the very low noise level.
As I operate phone and digital modes, the broad band characteristics of the TD-90 has been a joy to experience. Mine is mounted with the apex at 30 feet and the ends at 12 feet. There is a coax run of 60 feet to a remote coax switch, 30 feet to a grounded PolyPhaser lightning arrestor, and 15 feet to the rig.
I measured the VSWR on all bands with an RF Applications P-1500 digital RF power and SWR indicator. Findings were as follows:
1.8 to 2.0 MHz 1.1:1
3.5 to 4.0 MHz 1.1:1
60 meters 1.1:1
7.0 to 7.3 MHz 1.4:1
10.1 to 10.15 MHz 1.1:1
14.0 to 14.35 MHz 1.1:1
18.07 to 18.16 MHz 1.5:1
21.0 to 21.45 MHz 1.3:1
24.9 to 24.99 MHz 1.1:1
28.1 MHz 1.8:1
29.7 MHz 1.3:1
50.1 MHz 1.4:1
53.9 MHz 1.2:1
The SWR readings on my Icom 756PROIII agreed with the readings on the P-1500.
I highly recommend this antenna to anyone needing a dependable, broad band antenna.

Steve Pierce, W5BIV
 


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