Exterminator 3/4 v2

[pcs]

Antenna is listed here:
https://www.pcs-electronics.com/shop/an ... tor-steel/

Photo:


Manual:
http://www.pcs-electronics.com/software ... tor_en.pdf

Although antenna comes pre-tuned it is recommended that you re-check the SWR before putting antenna into service, nearby objects
and your method of installation can slightly de-tune the antenna.

Also, DO NOT forget to extend all telescopic sections!


Exterminator tuning instructions:
1. If you received pretuned antenna extend the two telescopic sections until black marker rings show.
If you are retuning extend the antenna as shown below (loosen screws and extend the 2 telescopic parts).
If tuning for around 88MHz: Extend fully
If tuning for around 100MHz: Extend 50%
If tuning for around 108MHz: Extend about 25%

2. Mount the bottom part of the antenna to the intended metal pole and tighten with screw firmly

3. If you received antenna pretuned, do not loosen gamma rod yet. Only do it later if SWR isn't perfect.
If this is a new untuned antenna or if you are re-tuning loosen the gamma strap so that the gamma rod can move in and out
with a little effort. Now set the rod so that it is about 1/3 in the black gamma match tube.

4. Connect RigExpert SWR analyzer (AA-170 or better), power it up, press 4 for SWR measurement. You can find AA-170 here:

5. Move center frequency to frequency of choice (use Freq - and Freq + buttons), set range to about 20MHz for a start,
you can reduce range later when you get close to the frequency of choice.

6. Press OK to start measurement. The curve minimum needs to be close to zero at the desired Frequency.

7. Change the length of the antenna until you get best SWR at desired frequency.

8. Change gamma rod position until you get best SWR at desired frequency.

9. Repeat 7 and 8 until you get minimal SWR reading possible.

10. Tighten all screws

11. Check SWR again. If needed, correct.

12. You're done!

PS: If you don't have antenna analyser, you can use SWR meter as well, however do this at minimal power that still makes it possible to get a decent reading out of your SWR meter and at the same time does not endanger the output stage of your transmitter. Never read SWR off the LCD display of your transmitter, USE A REAL SWR meter or antenna analyser

[pcs]

Exterminator antenna is now also available as a KIT:

https://www.pcs-electronics.com/shop/an ... tor-steel/

The KIT version has all the difficult to make small parts, the only thing missing are the long metal poles in the middle (see photo). By not including these antenna becomes much cheaper to ship plus you have the pleasure of putting this antenna together by yourself which is a bonus for many people. The antenna in KIT form is already cheaper, but the real savings come from shipping as the KIT is much much cheaper to ship.
You will have to buy this locally to assemble the KIT:
- Option 1: two telescopic aluminum poles, the thick one must be 40mm diameter and both about 1650mm long (1500mm if you are operating at 100-108MHz)
- Option 2: you can also use three shorter telescopic aluminum poles, 1120mm (1000mm if you are operating at 100-108MHz) each, the thick one 40mm diameter, the other two must slide inside.
- You may need a saw to cut a slit in the aluminum poles so it can be fastened with a clamp. If you buy factory finished telescopic pole this may be included.
- You may also need clamps to fasten the telescopic sections, any hardware store has those. If you buy factory finished telescopic pole this may be included.
- You will need a 60W or stronger soldering iron to solder the connector to the gamma match
- Assembly should take about 1 hour

[pcs]

Exterminator antenna is based on this design, adapted and modified for VHF band:
http://sirioantenne.it/en/products/hf/new-vector-4000

The improved gamma in model mark II is our idea.