Sirio GPE 5/8w and GPS 1/2w antennas..

The DB · Dec 12, 2014

I'll tell you what, I'll link you to the rules. You tell me where it specifically mentions the Predator or any other antenna... Oh wait it doesn't, and never has, so you can't... Way to spread BS.

http://www.gpo.gov/fdsys/pkg/CFR-2009-title47-vol5/pdf/CFR-2009-title47-vol5-part95.pdf

That being said, I am also not seeing the rules on metal antennas, which I know once existed. They used to be listed in Subpart E if memory serves, which was and appears to still be manufacturers rules. Perhaps they revised the rules at some point? That being said, I can tell you for certain that in all of the times I've read the rules, which was a fair number of times over the years, they never mentioned a brand of antennas by name, ever.

And for you, 0926, you really think the limit is a 10 mile range? It has always been 155 miles. Although now they seem to have changed it to 250 Km, which is 155.3 miles. Here, I'll even quote the text for you...

95.413 (CB Rule 13) What communications are prohibited? said:
(9) To communicate with, or attempt to communicate with, any CB station more than 250 kilometers (155.3 miles) away;

Further, it is nothing to exceed a 10 mile two way communications range, even mobile to mobile using something far less than a 5/8 wavelength base antenna on each end. If you really think the antennas you mentioned above are the only ones than can exceed a 10 mile range you clearly have a lot to learn when it comes to antennas. Hell, my Wilson 5000 on my mobile back in the day did it regularly.

There is another part of your BS being shown as wrong... I say again, see if you can confirm the rest of your BS. The rules are all linked right there just for you...

I'll continue to let my experience, and real world reports, guide my statements over your real world BS...

The DB

222DBFL · Dec 13, 2014

From my own experience the sirio tornado works well for me. I know it is not the one being discussed, but it does work well for the money. I don't run a lot of power (100 watts max) through my tornado and I can talk to almost 100 miles locally with it. While I'm sure there are far superior antennas being made, for the money, the Sirio antennas aren't that bad, JMO.

Robb · Dec 13, 2014

Ummm; no . . .

Any one of those antennas would exceed a 10 mile range transmitting.

What it really means is that the FCC has proclained that all CB radio operators are inherently stupid. They had to take their safety as their own responsibility. So they made a law to keep retailers for selling them to Cbers/11m.

So a smart Ham can come along and buy the same antenna, now relabled for 10m, because smart Hams can be trusted to not kill themselves putting up an aluminum antenna.

lol

bob85 · Dec 13, 2014

the p500 is nothing special,

there was a time when true 5/8waves exceeded the fcc's height restrictions for antennas mounted on your house/building,
antennas such as wilson v5/8 now maco & hy-gain clr2 were just under 20ft in length to get around that restriction,

read the law on shock hazard and cb antennas,
http://www.law.cornell.edu/cfr/text/16/part-1204

there is nothing best, ultimate, lowest takeoff angle, talking further about 11mtr 5/8 waves unless you are a cb antenna manufacturer who's income & cb forum status is dependent on people buying into the myth.

Shockwave · Dec 13, 2014

There are differences in the Sirio 1/2 wave and 5/8 wave and the Tornado line. First off, the length discrepancies between the 1/2 wave and 5/8 wave are due to the difference in radial lengths or absence of radials. Ground plane antennas tune up at the expected physical lengths when they are placed above a full "ground plane". When the radials are shorter than 1/4 wave or not installed, the resonant length of the antenna is also shifted. I noticed this first working for Motorola when tuning low band walkie talkie antennas. When measuring reflected power we had to be careful that nothing we did added any ground plane to the antenna or it would not be resonant when plugged into the top of the walkie talkie with no ground plane other than your hand on the case.

There was a time when I thought 16 short radials on the Sirio 2016 5/8 wave was a gimmick too. I figured if we could see no extra gain when adding more than 4 full length radials, the same would be true when they were only 24 inches. As it turns out each short radial is only able to draw off a certain amount of CMC. With 16 short radials each one is drawing more of the CMC off the feedpoint. Removing 8 of the 16 radials cause a very noticeable shift in resonant impedance while adding more than 4 full length ones does nothing.

While it may not be apparent, the 1/2 wave also has more turns on the coil to match its higher impedance although, they do look very similar. The Tornado is slightly different in that it has no DC shunt coil to ground. It just has a step up coil to match the impedance and is not DC grounded. It is the "economical" 5/8 wave and in most cases the operator will not notice any drawbacks with it. The only real exception would be if the antenna were to be installed in a lightning prone area like South Florida. Always opt for a DC grounded antenna in those cases.

222DBFL · Dec 13, 2014

Good stuff there shockwave. I looked at the Sirio 2016 as well when making my purchase. For what it's worth the tornado does good. While not in SFL, I am in central FL. I use plenty of lightning protection and also unplug when I know storms are in the forecast. No need to chance it for me. I have had good luck with the tornado but will eventually upgrade again. Antennas and antenna design, building, or even a good comprehension are things I do lack and am learning more by the day. I need to get my antenna to at least 1 full wavelength as right now it's only 20ft to base. It works, but not as good as I know it can. Anyway, again to all that have contributed to this post, and to the poster, thanks for posting this thread, it's helped me at least!! God Bless.

Christopher Race Lowe · Dec 31, 2018

SuperNasty said:
I have a problem understanding the Sirio basic endfed antennas, namely the Sirio GPE 27 5/8 wave and the Sirio GPS 27 1/2 wave.

Here goes!

BOTH of the Sirio antennas are 19ft 6 inches tall, the 5/8 wave and the 1/2 wave. Both antennas also come with an additional 3ft odd adjustable steel top rod that sits in the top to adjust the SWR, (Sirio provides a chart with guide sizes for each antenna that this top rod should be set at).

So, according to the sirio guide for a frequency of say 27.5 MHz the top rod should be set at 19 inches for the GPE 5/8 wave, so thats 19 inches on top of the 19ft 6 inches, bringing the total to 21ft and 1 inch for the GPE 5/8 wave.

For the same frequency, the same chart says that the top rod should be set at 22 inches for the GPS 1/2 wave, so thats 22 inches on top of the 19ft 6 inches, bringing the total to 22ft and 4 inches for the GPS 1/2 wave.

Question 1, how is it possible that the 22ft and 4 inches height of the GPS can be a half wave antenna? actually it's neither 1/2 wave or 5/8 wave height...?

Now the coils at the base on both antennas are visible through clear plastic and the most recent images show identical coils on both, (about 5 turns of copper then a gap then another 5 or so turns of copper).

Question 2, Should the matching network/coils on a 5/8w and 1/2w not be different for the different impedances?

Other than that the only thing I can see different on these two antennas is the addition of the ground plane radials that come with the GPE 5/8 wave.

Anyway I have a Sirio GPS 1/2 wave, and what's started me off thinking about all this is..,

Question 3, if I add radials to the base of my 1/2 wave GPS antenna will it perform better than without them? and will it actually be equal to the performance of the GPE 5/8 wave?

My query is a bit drawn out but you can understand why I am a bit miffed at this.

73s

I have been using the Sirio 27 GPE 5/8 Groundplane Antenna for over three years and love it I connected a mfj antenna analyzer to it with a short jumper and set the top section until my swr were 1.5 on 27.545Mhz and locked it down. i have good swrs on both the 11 and 10 meters and with a tuner have been able to tune to 80,40,15,12,10 and 11 meters made a contact on 40 meters from MA from my house in AR on a yaesu ft 757 with the sirio groundplane awesome antenna!!! 73 N5CRL/Redbone ch 1 AM

hotrod · Jan 1, 2019

There was a time when I thought 16 short radials on the Sirio 2016 5/8 wave was a gimmick too. I figured if we could see no extra gain when adding more than 4 full length radials said:
thanks for lesson on 2016 thats what i use. ive had really good luck with it. my locals laugh wen they see all those short radials.. tell me they dont do nothing when that short

Red Bull · Feb 1, 2020

Christopher Race Lowe said:
I have been using the Sirio 27 GPE 5/8 Groundplane Antenna for over three years and love it I connected a mfj antenna analyzer to it with a short jumper and set the top section until my swr were 1.5 on 27.545Mhz and locked it down. i have good swrs on both the 11 and 10 meters and with a tuner have been able to tune to 80,40,15,12,10 and 11 meters made a contact on 40 meters from MA from my house in AR on a yaesu ft 757 with the sirio groundplane awesome antenna!!! 73 N5CRL/Redbone ch 1 AM

@Christopher Race Lowe did you have issues with your SWRs with this antenna? Not sure I like the clear cover over the coils at the base of the antenna.

AudioShockwav · Feb 2, 2020

General FYI to everyone.
The FCC dropped the 155 rule in it last round of rule changes.
There is no longer a limit.

73
Jeff

parkermonte55 · Mar 14, 2024

SuperNasty said:
I have a problem understanding the Sirio basic endfed antennas, namely the Sirio GPE 27 5/8 wave and the Sirio GPS 27 1/2 wave.

Here goes!

BOTH of the Sirio antennas are 19ft 6 inches tall, the 5/8 wave and the 1/2 wave. Both antennas also come with an additional 3ft odd adjustable steel top rod that sits in the top to adjust the SWR, (Sirio provides a chart with guide sizes for each antenna that this top rod should be set at).

So, according to the sirio guide for a frequency of say 27.5 MHz the top rod should be set at 19 inches for the GPE 5/8 wave, so thats 19 inches on top of the 19ft 6 inches, bringing the total to 21ft and 1 inch for the GPE 5/8 wave.

For the same frequency, the same chart says that the top rod should be set at 22 inches for the GPS 1/2 wave, so thats 22 inches on top of the 19ft 6 inches, bringing the total to 22ft and 4 inches for the GPS 1/2 wave.

Question 1, how is it possible that the 22ft and 4 inches height of the GPS can be a half wave antenna? actually it's neither 1/2 wave or 5/8 wave height...?

Now the coils at the base on both antennas are visible through clear plastic and the most recent images show identical coils on both, (about 5 turns of copper then a gap then another 5 or so turns of copper).

Question 2, Should the matching network/coils on a 5/8w and 1/2w not be different for the different impedances?

Other than that the only thing I can see different on these two antennas is the addition of the ground plane radials that come with the GPE 5/8 wave.

Anyway I have a Sirio GPS 1/2 wave, and what's started me off thinking about all this is..,

Question 3, if I add radials to the base of my 1/2 wave GPS antenna will it perform better than without them? and will it actually be equal to the performance of the GPE 5/8 wave?

My query is a bit drawn out but you can understand why I am a bit miffed at this.

73s

I have the same question

parkermonte55 · Mar 14, 2024

SuperNasty said:
I have a problem understanding the Sirio basic endfed antennas, namely the Sirio GPE 27 5/8 wave and the Sirio GPS 27 1/2 wave.

Here goes!

BOTH of the Sirio antennas are 19ft 6 inches tall, the 5/8 wave and the 1/2 wave. Both antennas also come with an additional 3ft odd adjustable steel top rod that sits in the top to adjust the SWR, (Sirio provides a chart with guide sizes for each antenna that this top rod should be set at).

So, according to the sirio guide for a frequency of say 27.5 MHz the top rod should be set at 19 inches for the GPE 5/8 wave, so thats 19 inches on top of the 19ft 6 inches, bringing the total to 21ft and 1 inch for the GPE 5/8 wave.

For the same frequency, the same chart says that the top rod should be set at 22 inches for the GPS 1/2 wave, so thats 22 inches on top of the 19ft 6 inches, bringing the total to 22ft and 4 inches for the GPS 1/2 wave.

Question 1, how is it possible that the 22ft and 4 inches height of the GPS can be a half wave antenna? actually it's neither 1/2 wave or 5/8 wave height...?

Now the coils at the base on both antennas are visible through clear plastic and the most recent images show identical coils on both, (about 5 turns of copper then a gap then another 5 or so turns of copper).

Question 2, Should the matching network/coils on a 5/8w and 1/2w not be different for the different impedances?

Other than that the only thing I can see different on these two antennas is the addition of the ground plane radials that come with the GPE 5/8 wave.

Anyway I have a Sirio GPS 1/2 wave, and what's started me off thinking about all this is..,

Question 3, if I add radials to the base of my 1/2 wave GPS antenna will it perform better than without them? and will it actually be equal to the performance of the GPE 5/8 wave?

My query is a bit drawn out but you can understand why I am a bit miffed at this.

73s

I have this same question. Have a GGPE 27 and set up as a GPS 27

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Sirio GPE 5/8w and GPS 1/2w antennas..

The DB

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222DBFL

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Robb

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bob85

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Shockwave

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222DBFL

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Christopher Race Lowe

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hotrod

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Red Bull

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AudioShockwav

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parkermonte55

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parkermonte55

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