Jump to content

Recommended Posts

Parrothead

@Oz Jon, I was informed today that Cootel was going to move tower locations (READ: already had moved), thus causing the signal to drop at the farm. We are talking a serious drop in signal, so much that they suggested we discontinue the service with them. My thread regarding our Cootel service.

 

Fortunately, I had already begun to cover all my bases, by contacting the omnidirectional antenna manufacturer, via email, for price and availability on a yagi antenna offering similar specs (frequency range, impedance, etc.). And, I have been discussing with you, the possibly sending the signal from my apartment in the city, to the farm, as well.

 

Anyway, below is the specs sheet for the omni, which I sent to him. He, quite obviously, did not read the subject line of the email, or the specs sheet, aside from the model number of the antenna. 

antenna_specifications.jpg

 

 

Here are a couple of the (several) PDFs he sent to me:

 

TDJ-1900ACY7.pdf

TDJ-1900SP10.pdf

 

Keep in mind, I was quite clear in the frequency range I needed, which was stated in the subject line, as well as on the specs sheet.

 

 

Share this post


Link to post
Share on other sites
Oz Jon

Well, it's possible that a grid parabolic antenna may work (nearly as well?)  at frequencies just beyond it's design frequency band - it's a relatively "wide-band"  design.

 

However, it is extremely unlikely that a yagi would do the same. A yagi is an inherently narrow-band (tuned) device.

 

When you say Cootel is going to move "tower locations" I guess they meant their antenna will be re-located lower on  same tower? - not that they are going to move the antenna to a new site location? 

 

If the former .... any idea what the new height will be?

 

 

ps.  Have you tried re-locationg your farm antenna on your existing mast?  If Cootel  haven't lowered their antenna too much, you may find a better height?

Edited by Oz Jon
afterthought

Share this post


Link to post
Share on other sites
Parrothead
6 minutes ago, Oz Jon said:

When you say Cootel is going to move "tower locations" I guess they meant their antenna will be re-located lower on  same tower? - not that they are going to move the antenna to a new site location? 

 

They moved from one physical tower, to another. The original tower was Southwest of us. Now, they are broadcasting from a tower Southeast of us.

 

7 minutes ago, Oz Jon said:

If the former .... any idea what the new height will be?

 

None whatsoever. I am about to leave to meet a guy who works for them, now. I hope he can give me some information on the new location, height, etc.

Share this post


Link to post
Share on other sites
Oz Jon
25 minutes ago, Parrothead said:

 

They moved from one physical tower, to another. The original tower was Southwest of us. Now, they are broadcasting from a tower Southeast of us.

 

 

None whatsoever. I am about to leave to meet a guy who works for them, now. I hope he can give me some information on the new location, height, etc.

 

Well! ...... that means starting all over again with a 3rd RF path design!

 

As soon as you can get some new tower co-ordinates I'll do another one.

 

This is becoming a habit! - Lol!

 

ps.

 

I wouldn't be surprised if the antenna manufacturer/supplier has similar products at the frequencies you specified.  Maybe your correspondent was a bit sloppy (or ignorant, or just plain stupid?) and just sent you the spec sheets for similar antennas. I suggest that you get back to him and clarify that.

 

Edited by Oz Jon
afterthought - I'm good at that!
  • Like 1

Share this post


Link to post
Share on other sites
Parrothead
3 hours ago, Oz Jon said:

As soon as you can get some new tower co-ordinates I'll do another one.

 

Well, he has no idea where the "new" tower is located. In his defense, he works at Cootel's office in Phnom Penh. His wife and Chan are close friends - relatives, I believe. I will have to see if I can go searching for it, over the next couple of days. We are in town today to get some stuff to take back to the farm. 

 

3 hours ago, Oz Jon said:

This is becoming a habit! - Lol!

 

Ain't it, though!?

 

3 hours ago, Oz Jon said:

I wouldn't be surprised if the antenna manufacturer/supplier has similar products at the frequencies you specified.  Maybe your correspondent was a bit sloppy (or ignorant, or just plain stupid?) and just sent you the spec sheets for similar antennas. I suggest that you get back to him and clarify that.

 

Well, if I can communicate with someone who knows what they are talking about there, I may be able to find out. 

 

HOWEVER...

 

I did start looking on eBay for antenna distributors. I found one, out of Oz in fact, that seems to carry a wide array of antenna parts and accessories. The guy is very knowledgeable and replies very fast to communications. Here is the site, if you would like to have a look: http://onwireless.com.au 

 

Here is one yagi that would work fine for me: http://onwireless.com.au/16dbi-4g-lte-1800mhz-yagi-antenna-fme.html

 

DB1800.gif

 

DB1800-rad.gif

 

1800-16dbi.png

 

They also carry a good quality coax, which I would prefer over the cheaply made coax we have here. (I bet changing the coax alone, would make a heck of a difference in signal strength.) It is LL400 coax. Of course, their LL195 coax would probably be leaps and bounds ahead of what I currently have.

 

 

Edited by Parrothead
Added images.
  • Like 1

Share this post


Link to post
Share on other sites
Oz Jon

I don't know that company, but their products look like professional stuff and they talk professional.

They know all about cable loss and good-v-cheap&nasty coax.

Their claimed antenna performances look realistic.

 

The fact that their yagi comes fitted with a cable tail and uses an SMA (pro quality) connector and good weather sealing tape , speaks volumes to me, that these guys know what they are doing. They look like a good choice to me.

 

You have another advantage in buying from an Oz company - they are constrained by serious Oz consumer protection law. If they make a claim, they'd better be prepared to prove it! #

 

My only warning is to double check the frequency bands which Cootel use and the frequency band of the antenna you plan to buy.  Just stating 1800MHz band can be dangerous - frequency plans are not standardised internationally.

 

# if they mess you about, I can speak sharply to them on the phone for you - I'm good at that - Lol!

 

Edited by Oz Jon
  • Like 1

Share this post


Link to post
Share on other sites
Parrothead
On 5/20/2018 at 2:21 PM, Oz Jon said:

My only warning is to double check the frequency bands which Cootel use and the frequency band of the antenna you plan to buy.  Just stating 1800MHz band can be dangerous - frequency plans are not standardised internationally.

 

The question of 1800 Mhz / 4G came up, regarding that very antenna. (The antenna page linked above.)

 

On that page, if you scroll down a bit, you will see "NOTE !!  4G LTE 1800MHz only - NOT suitable for 3G or nextG". This prompted me to ask the guy I met for breakfast today, who confirmed the frequency range does, in fact, broadcast a 4G signal. (To be perfectly honest, I wasn't sure if it did, or not.) I would have been pretty mad at myself, had I wasted the time, effort, energy and money, having it shipped here, only to not work.

 

On 5/20/2018 at 2:21 PM, Oz Jon said:

# if they mess you about, I can speak sharply to them on the phone for you - I'm good at that - Lol!

 

Thanks, mate. I'll keep that in mind as a last resort. :) 

 

On 5/20/2018 at 9:15 AM, Oz Jon said:

wouldn't be surprised if the antenna manufacturer/supplier has similar products at the frequencies you specified.  Maybe your correspondent was a bit sloppy (or ignorant, or just plain stupid?) and just sent you the spec sheets for similar antennas. I suggest that you get back to him and clarify that.

 

Oh, I almost forgot. I did reply to the guy from http://www.kenbotong.com, the manufacturer of my omnidirectional antenna. I am waiting for him to get back to me.

 

 

Share this post


Link to post
Share on other sites
Parrothead

Okay. The guy at www.kenbotong.com replied with two new attached files. 

 

TDJ-1800ACY7.pdf - 7 element yagi 1710-1880 Mhz

TDJ-1800BKB.pdf - Radome panel antenna 1700-1920 Mhz

 

They must be free. He has yet to give me any prices or lead times, although I have asked for both. 

 

==============================================================

 

LOL. I replied to him with a request for price and availability again. His reply:

 

Hi Paul,

MOQ 10PCS.

 

How in hell the Chinese sell so much shit in this world, I will never know. I would rather pull my hair out, single strand at a time - with tweezers, than to have to communicate with them via email.

Share this post


Link to post
Share on other sites
Parrothead

On a positive note, the yagi antenna is only $19 USD, while the radome panel antenna is $22.00 USD. But, after all of these communications, he insists that I buy 10, yes 10 of either of those antennas. He won't just sell me one of either of them. Anyone interested in going in on 10 antennas? What a complete and utter waste of fecking time. :rolleyes:

Share this post


Link to post
Share on other sites
John_Galt
2 hours ago, Parrothead said:

Hi Paul,

MOQ 10PCS.

 

Tell him you need a sample once you have it installed and working you will talk to him about ordering more. 
 

 

  • Like 1
  • Funny 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • If you would like to join to begin posting and become an active member, feel free to click on THIS LINK, to register. If you have any questions, feel free to post them in the Forum Operations / Issues forum. If you register, but then are unable to log in, please feel free to post concerns in the Having Problems Logging In? forum. We will address any and all questions, comments, or concerns, as quickly as possible. Welcome to the Living In Cambodia Forums! 

    Welcome to the forum!

  • Similar Content

    • Parrothead
      By Parrothead
      You may have noticed something new in posts, since we upgraded to v4 of the IPB software. That new addition, is Acronym Expansion. You will notice a dotted line under acronyms / initials, like IPS, for example, the creators of the IPB software. If you mouse over these various groups of letters, a popup window will show you the expanded meaning of those initials, in case you may not be familiar with them. I will try to add more of these, as they come to mind, or as I see them in various posts on the site. If you have any you would like to see added, just let me know. Here are a few I have added, which some of you may find useful:
       
      EOS, FWCMS, COLA, DOB, NGO, FUBAR, PPPPPPP,  SFA, FFS, YMMV, etc. 
       
      For some of us who appreciate electronics, computers and such, AC, DC, SPST, SPDT, NiFe, NiCd, AH, FLA, GUI, WiFi, WAN, LAN, SWR, EER, BTU, BTUh, etc. 
       
      I have also added some cities in Cambodia, PP, SR, BTB, and SHV.
       
      Lastly, I have added various currencies and miscellaneous other acronyms. I have 104 acronyms, currently. Always adding more, as time permits.
       
       
       
    • Parrothead
      By Parrothead
      Provincial internet access in Cambodia.
       
      Chan spoke with her friend, who happens to work at Cootel and lives just down the road from the farm. She had her internet service there while on holiday, a little while back. So, we figured we would give it a go. She (the friend) helped schedule a test / installation trip for us.
       
      We met the installer from Cootel, yesterday, at the farm. He came armed with 2 different units, a fiberglass 9dB gain antenna and 10 meters of coaxial cable with both N and SMA connectors. One unit was a CPE-153W; the other a CPE-168W. He informed me that the CPE-168W allows faster access than the CPE-153W.

       
      The rear image (below) shows an Ethernet connector. While this is accurate for the CPE-153W, the CPE-168W has a USB connector to hard wire a computer to the modem / router. Devices may access the router via WiFi, as well. (I'm not sure of the range of the transmitter, though. The WiFi antenna is internal.)

       
      When he tested them, the CPE-168W, quite obviously, came out on top. The CPE-158W was about 1.5 Megabits down; .73 Megabits up. The CPE-168W was at 6.3 Megabits down; 1.5 Megabits up.
       
      Here is an image of the rear of my personal CPE-168W modem / router:

       
      To gather these speeds, he mounted the 88cm fiberglass antenna to a bamboo pole we had in the yard. But, this only placed it just above the roof.

       
      The monthly service is $15 USD / month, uncapped. If I buy 6 months, I get one month free. 
       
       
    • Parrothead
      By Parrothead
      Well, this afternoon, we had the first heavy rain since we arrived at the farm earlier this month. Even with the 9dB gain omnidirectional antenna, there was no, zero signal loss at the modem. Have a look at the :30 seconds video:
       
       
    • Parrothead
      By Parrothead
      Howdy,
       
      First, some images of the tower that broadcasts the signal:
       

       

       

       
      We stopped by there on the way back to the apartment today, to get a few images and to grab its GPS coordinates.
       
      The tower is located at: 12.974649, 103.053851 decimal, or 12° 58' 28.7364'' N by 103° 3' 13.8636'' E
       
      The farm's GPS coordinates are: 12.9867798, 103.0072846 decimal, or 12° 59' 12.4073'' N by 103° 0' 26.2246'' E
       
      I still have to work on the Google Earth elevations.
       
       
    • Parrothead
      By Parrothead
      Metfone has internet access running out Highway 57 (Southwest toward the farm). But, the access is limited to just off the highway. So, I have been working on a solution, to get the internet extended to the farm. I finally received, compliments of a friend, two TP Link CPE-510's. One will function as an Access Point for the other unit, while it will serve as a Client. They are good for about 15 kilometers, according to the specifications. I just have to complete the tower builds (one has to be looked at again, due to my findings, below) and have the antennae mounted up top. Both are powered via POE (Power Over Ethernet). 
       

       

       
      There is a 3.35 meters (11 feet) difference in the elevation, with the highway being on the lower end. I have to take this into account when mounting these units. So, I now need an extra story high, at which to mount that unit.    Sort one thing out, and two other issues crop up. 
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use & Guidelines. Here is our Privacy Policy.