Best Mobile CB antenna

[hotrod]

I never even seen a Sirio mobile antenna to this day.
Sounds pretty decent - though.
Screws right on to a Wilson mag-mount you say - eh?
Better still!

Now, a single S-unit is equivalent to 6db's; and two S-units would make a 12db change.
And every 3db change upward would double the percieved volume/loudness to the ear.
That is a lot!
If it was only a couple of db's - I wouldn't consider it.
But if it is a couple of S-units; well - that's a horse of a different color!

So - is it 'S-units' or 'db's'?

i seen a 2 sunit increase on the base station
i was doing the test with.i went on direction so many miles then turned around went so many miles ther directionas far as never seen them go to h&yelectronics.com or theres another site i beliueve its thunderpole.co.uk
they have lots

 

[Robb]

NEW Mobile Antenna From SIRIO-H&Y Electronics
Specs show it at a 2dbd gain.
???
Nice price...I'm thinkin about it...

 

[BOOTY MONSTER]

"Now, a single S-unit is equivalent to 6db's; and two S-units would make a 12db change.
And every 3db change upward would double the percieved volume/loudness to the ear.
That is a lot! "

in audio terms a 3 db increase in volume will double the rms audio watts in a speaker . and of course reducing spl by 3 db will decrease necessary audio watts by half . it actually takes a 10 db increase in audio db/SPL to double the apparent SPL . a db of audio spl and a db of rf gain are two entirely different things .

this link says it better than i can ..
Relationship Between Watts and dBs — Reviews and News from Audioholics

meters on cb radios will vary greatly in their accuracy (they arnt) and are only good for a very loose comparison , but they arnt accurate enough for any type of reference

 

[Robb]

"Now, a single S-unit is equivalent to 6db's; and two S-units would make a 12db change.
And every 3db change upward would double the percieved volume/loudness to the ear.
That is a lot! "

in audio terms a 3 db increase in volume will double the rms audio watts in a speaker . and of course reducing spl by 3 db will decrease necessary audio watts by half . it actually takes a 10 times increase in audio db/SPL to double the apparent SPL . a db of audio spl and a db of rf gain are two entirely different things .

this link says it better than i can ..
Relationship Between Watts and dBs — Reviews and News from Audioholics

meters on cb radios will vary greatly in their accuracy (they arnt) and are only good for a very loose comparison , but they arnt accurate enough for any type of reference

Right. But in a CB radio that doesn't have the power/watts to percieve this change; it should still be an appreciable level in audio level - relative to the same radio. Unless you hook it up to an external audio amp and push some power and see the SPL difference involved. Might be a fair way of testing the antenna as well...

What I am trying to point out - is that it should be appreciable and noticable IF all is true concerning the Sirio antenna. So, if I spend the ~$50 to get one of these babies - I would EXPECT to see a gain in performance. Otherwise, I'm still very satisfied with the performance of the Wilson 1000 as it is. Is the Sirio REALLY that much better - and WORTH going the distance to upgrade ?!? Some that have both have said as much...

AS of now, it looks like the Predator 10k and the Sirio 4000 seem to be at the top of the heap - as far as which is best for mobile CB's are concerned...

 

[mackmobile43]

That DC ground thingy. If it were DC grounded it would mean there had to be a ground at the base of the antenna. If you're going to do that, why not just drill the hole and do it right? Mag-mounts work through capacitive coupling through that magnet. Actually the magetism has nothing to do with anything except holding the thing on. But the magnet acts as one plate of a capacitor and the metal body of the vehicle as the other plate. It works and that just great. But it does have limits which relate to frequency of use, and surface area. Oh well. Not telling you anything new with that.


Shunts.
Actually they are inductive links with ground for most base loaded antennas. They help, or do the impedance matching which is always required with antennas. Just wish they were adjustable!
- 'Doc

This is what one guy at the other forum has to say: "
the coil is probably grounded at the base and tapped for the 50ohm feed point on the reverse side of what is shown in the cutout picture of the base coil."

LOL, there is no point of contact for ground until you get to the base of the antenna so tapping the coil before you reach that area is still no good. Here is the link for the 300 and 4000 series which is possible that dc ground is there.
Sirio Antenne - Products

But on the 5000 series there is a single section that pivots and is the only path from the antenna to the base so there can be no shunting before the pivot section and it would have to be in the base so tapping the coil is impossible before the pivot.
Sirio Antenne - Products

Pictures don't lie.

 

[delta]

I've had my Sirio 300 for about ten years and it out performs any other mobile twig i've tried. It's the biz of an antenna.


At knights- electron they say.
The Sirio 4000 is A high quality 7/8 wave mobile antenna.

A larger version of the Hypower 3000, this one features a 2m long whip.

The coil is made from heavy duty plastic and contains a large cross-section copper coil. A swivel adjusment at the top of the coil allows the whip to be angled to suit the position it is mounted.

The whip is tapered and of high quality stainless steel.

Probably the best antenna available - it will certainly outperform a Wilson!

http://www.kcb.co.uk/shop2/index1.html

 

[delta]

I just found this thread by Bob85.


http://www.worldwidedx.com/cb-antennas/24451-new-sirio-antenna.html

 

[BOOTY MONSTER]

http://www.worldwidedx.com/cb-antennas/27506-z-180-anyone-else-have-one.html

 

[Robb]

http://www.worldwidedx.com/cb-antennas/27506-z-180-anyone-else-have-one.html

I just finished reading all nine pages of that thread.
I recommend that read.
THNX - BootyMon!

But this thread/link also raises some more questions:
Is the Sirio Z-180 the ULTIMATE base load antenna?
Should I forget about the Sirio 4000 in favor of the Sirio Z-180?
Do they still make the Sirio Z-180?
Or would I do as well by putting a larger diameter stinger/whip on my Wilson 1000?
op:

 

[BOOTY MONSTER]

i replaced the stinger in my 10k with a fatter/stiffer munky maid stinger (drilled it) and it had no effect on my TX or RX . it does make a LOT more noise when going under drive throughs and i went under one really low one and it bent the roof around the mount and the antenna was cocked back about 15-20 degrees . the 10K was unaffected though . its a old vehicle so no biggie , easy fix .
if you do drive throughs make notice of the height befor you go under . LOL

 

[mackmobile43]

I took out 2 rows of 8' florescent tubes with my 27'' shaft 10-k at the local Ace hardware.

 

[hotrod]

I just finished reading all nine pages of that thread.
I recommend that read.
THNX - BootyMon!

But this thread/link also raises some more questions:
Is the Sirio Z-180 the ULTIMATE base load antenna?
Should I forget about the Sirio 4000 in favor of the Sirio Z-180?
Do they still make the Sirio Z-180?
Or would I do as well by putting a larger diameter stinger/whip on my Wilson 1000?
op:

sorry to my best of knowledge the z180 isnt advailable.i got mine from coppers in 07 or 08?you will see a noticable gain .however it wont be huge.at 20 miles my wilson with a stock 68 showed signs of fading signals .so i stoped screwed on on sirio i was
being heard again as well i was hearing my base.there was only a 1-sunit increse but hey that was the differece between not being heard and being heard.i drove other direction i has slightly better results.i seen almost 2 -s units.sooo thats why i said 1-2 sunit increase

 

[russ]

I just finished reading all nine pages of that thread.
I recommend that read.
THNX - BootyMon!

But this thread/link also raises some more questions:
Is the Sirio Z-180 the ULTIMATE base load antenna?
Should I forget about the Sirio 4000 in favor of the Sirio Z-180?
Do they still make the Sirio Z-180?
Or would I do as well by putting a larger diameter stinger/whip on my Wilson 1000?
op:

Hi Rob,

I have one of those Z-180 antennas that I bought last year but was not able to get a good SWR reading as the 1000 had..if you are interested I will let you do give it a sample test on your current set up and see if it works well for you...
I will contact you on the band.
Russ

 

[Robb]

Hi Rob,

I have one of those Z-180 antennas that I bought last year but was not able to get a good SWR reading as the 1000 had..if you are interested I will let you do give it a sample test on your current set up and see if it works well for you...
I will contact you on the band.
Russ

Awright Russ!!!
I'm glad you joined the forum...Too cool!!!
Sure I'll try it out...and review it...

 

[JC_enfield]

.

well It looks like the Sirio Hi Power 3000 and 4000 are the best mobile antennas it seems.

I do have a 9ft tank whip which i am going to try next time i am static mobile and see how well it peforms against the sirio's

Thanks for all of your input.

Many thanks to Bob and Delta for helping me clear this one up

73's