Two-Way Radios: Types, Antennas & Licencing Proceedure

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Family_Dog
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Real Name: Eric
Club VHF Licence: HC101
Location: Klerksdorp, NW
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Sun May 18, 2008 8:19 pm

The article referred to here is in the "Member's Articles" sub-heading, but it appears not to be too obvious.

Here is the url for the discussion:

http://www.hilux4x4.co.za/radios/index.php


Please take careful note of the following:


You may NOT possess or operate any two-way radio equipment (other than the "licence-free" low-power portable radios. You are required to FIRST obtain an ICASA licence for any other radio, whether it be 27/29MHz, VHF, etc. Please read the appropriate sections regarding a Radio Communications Licence in the link above and download the Radio Communications Licence PDF for submission to ICASA before you purchase or operate any Radio Equipment. Follow the example for completing the form.



-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Family_Dog
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Real Name: Eric
Club VHF Licence: HC101
Location: Klerksdorp, NW
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Sun Jun 29, 2008 6:29 pm

Here is some info on the Compact 29MHz antenna which I scanned this afternoon:

The first picture shows difference in Antenna lengths, without the Swivel Base.
P1010480-R.jpg

The second picture shows the standard antenna mounted on White Fang inside the garage. Note the length of the whip.
P1010483_R.jpg

The third picture shows the Compact antenna mounted with far less "bending" of the whip.
P1010484_R.jpg

Note: The antenna on the driver's side of the Hilux is a conventional 5/8 VHF Antenna.


Lastly, the spec sheet of the Compact Antenna.
Scorpion 29MHz Compact Antenna.pdf
Compact 29MA Specs
(19.02 KiB) Downloaded 50 times


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Niel
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Sun Jun 29, 2008 7:00 pm

Eric. what do you loose with the shorter antenna?........
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Family_Dog
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Sun Jun 29, 2008 8:02 pm

Niel,

In theory you might lose a tiny amount, but in practise it's probably unmeasurable. The length of any antenna is determined by the frequency of the transmitter, so you are losing with both antennas in any case, because their length *should* be in the order of 11 metres. This is, of course, totally impractical for our purposes, so what they do is to take up excess length in the coil, so that the radio still sees 11 metres.

The more steel whip, the greater signal advantage, but considering the maximum useful power of a 29MHz radio is in any case only some 4 - 5 watts, the loss of a further (possible) 10%, i.e. half watt, should in effect have no measurable deterioration in transmission path.

Considering we have more than 10% signal loss when an antenna is mounted on a bullbar, compared to where the ideal antenna mount position actually is (in the middle of a fairly large metallic roof), the convenience of a more-manageable antenna is in my opinion a worthy consideration. For the average 4x4er, he would only require to communicate with the vehicles immediately in front of and behind him, so this would be ideal for him.

The plus side with the compact antenna is that it would not whip around nearly as much as a standard length whip, which thus has a negative influence on communication range. The whip is thicker than the standard tapered whip and is therefore less likely to flop about when driving.


-F_D
Image

White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Niel
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Sun Jun 29, 2008 8:57 pm

Thanks Eric, do you have any stock?
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Family_Dog
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Sun Jun 29, 2008 9:01 pm

I ordered two to test, one is on White Fang, the other should still be at work.

I will be ordering stock tomorrow, there's a few guys on the Community Forum that want as well.


-F_D
Image

White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Niel
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Sun Jun 29, 2008 9:12 pm

I am in as well. Pls PM me your bank details and final amount :D
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Family_Dog
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Town: Klerksdorp
Vehicle: Hilux DC SFA, Hilux 2.7 DC, Hilux 2.7 SC, Prado 95 VX
Real Name: Eric
Club VHF Licence: HC101
Location: Klerksdorp, NW
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Mon Jun 30, 2008 3:51 pm

Niel,

I have ordered stock, will be here in a day or two. A single whip is going to be difficult to send via post, due to it's construction. What I'd like to suggest is that I send a batch of, say, ten whips down to you and you distribute them accordingly.

I spoke to the designer of the antenna today and the reason he designed this antenna is specifically for Convoy use amongst 4x4 users. Maximum obtainable range was never the consideration, functionality & practicallity were the main design objectives. It was designed primarily as a "Convoy" antenna, not as a long range communicator.

Whip & Coil assemblies will cost R170.00 inclusive, if sent in a batch of minimum ten whips in one parcel. Think you can whip (pun intended :)) up some other purchasers?


-F_D
Image

White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


Image
User avatar
Niel
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Mon Jun 30, 2008 3:54 pm

Family_BullDog wrote:Think you can whip (pun intended ) some other purchasers?
The only wipping I had in mind did not include 29 mhz antennas (pun intended) :shock: :lol:

Post and unbelievable deal for the forum ouens ....one they cant refuse and I will distribute in CT :?:
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ThysdJ
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Mon Jun 30, 2008 3:55 pm

Oh Niel you dirty bugger!! :shock: :twisted: :twisted:
Thys de Jager
CEO and Refreshments Manager at Team Offroad.

2010 Hilux 3.0 D4D D/C 4x4 with GOMAD "Brood" Canopy. Tripod.
1997 Jeep Wrangler TJ 4.0 Sport. The original SFA. AGA... Gooi kole
email: thys@teamoffroad.co.za

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