I wonder how do you guys manage radio interference in the field. I remember somebody suggested for radio frequency scanner. This means that one needs frequency programming capability in the field.
Thank you.
I usually drive up to the GPS base and look at the PDL radio, if the TX (transmit?) light is not flashing and the RX (recieve?) is flashing, I switch the RTK radios system to another channel.
I am running the PacCrest HPB450 as a base. When I power it on, I manually switch the channel to the lower case "b". This starts the radio to scan through all of the channels and look for the channel with the least traffic. It will switch itself to that channel. The process takes about 15-20 minutes, so I set the base radio up first. While the radio scans, I can set the other base equipment up, get my file going, take a leak, whatever.
A bearcat handheld scanner can search an entire range of bandwidth in a matter of seconds. It will stop on the channel that is found broadcasting. I use an old Bearcat by uniden. Determine what frequencies your system can transmit at and pre-program it or have it search an entire range in small increments in a matter of seconds.
The problem with using a scanner to check a range of frequencies is that voice traffic is sporadic. The voice users might have nothing to talk about, but just when you want to send data, they suddenly want to gab. Checking only the channels programmed in your data radio will concentrate much more on the frequencies of interest, and have a better chance of catching the sporadic transmissions.
Good one, have to try that, Thanks Bryan
Hi Bryan!
Does it mean you need to preprogram range of frequencies for the radio modem to scan through?
Your tip is actually an eye opener and provided me a good lesson to always go back to the basics - operation manual. It was just a while ago that I learned the Autobase and Autorover features.
thank you so much.
Regards.
> I am running the PacCrest HPB450 as a base. When I power it on, I manually switch the channel to the lower case "b". This starts the radio to scan through all of the channels and look for the channel with the least traffic. It will switch itself to that channel. The process takes about 15-20 minutes, so I set the base radio up first. While the radio scans, I can set the other base equipment up, get my file going, take a leak, whatever.
Amdomag, no sir...
My radio starts scanning from the channel I was last on, then scrolls through the channels from low to high, (Channels 0-13 for a total of 14). The lower case "b" almost looks like channel 6, but without the horizontal bar across the top. After channel 13, comes what could look like a letter "r", the "b" is the next click after. While the modem is scanning, a "dot" flashes in the lower right hand corner of the channel display. Again, this takes about 15-20 minutes. I also do not connect my GPS receiver to the modem until after the scanning is complete. Of course, then I have to configure my receiver parameters to broadcast on the new current channel.
See Rule Number 3 under the subject line:
How can I improve the performance of my radio modems?
Thank you so much with your input. 🙂
Frequency selecting - not programming
I have no idea of how it works in the Philippines, but in the U.S. of A. the frequency coordinators (private organizations certified by the Federal Communications Commission to manage allocation of certain segments of radio spectrum) somehow considered the fact that most surveyors using RTK GPS would be working over unpredictable geographic areas for fairly brief periods at any one place and decided a workable solution would be to assign RTK GPS users a set of frequencies they could use on an as-available basis.
This approach works pretty well for the most part, especially when you get away from the population centers.
For the last decade-plus, almost all private-sector RTK GPS users, except for permanent-base installations, have been licensed to the same set of 13 frequencies.
Those 13 frequencies, or whatever is on the individual user's license, are the frequencies that are programmed into the user's radio modems. The user can select the best of those frequencies for use at a specific time and place. There is (or should be) no entry of additional frequencies in the field.
The FCC does what it can to keep the software used to program frequencies into radio modems restricted to manufacturers and their authorized dealers so things do not get out of hand.
Tell us how it works over there - does the spectrum-management agency license RTK GPS surveyors to a set of frequences or just one frequency? Can you use that frequency anyplace in the country?
GB
Frequency selecting - not programming
Frequency regulations in the Philippines simply doesn't work so I need that versatility in the field.
I am not a radio telecom expert and not a guru on PDL radio modems as well. In fact, I am just utilizing the modem as it was set by my supplier. When I purchased my Leica GS09, the PDL cable was not included to bring down cost. As I understand my supplier, I need the programming cable to be able to assign frequencies. I guess, these frequencies are the ones to be scanned during the AutoBase mode.
Your input is highly appreciated.
Thank you.
> I have no idea of how it works in the Philippines, but in the U.S. of A. the frequency coordinators (private organizations certified by the Federal Communications Commission to manage allocation of certain segments of radio spectrum) somehow considered the fact that most surveyors using RTK GPS would be working over unpredictable geographic areas for fairly brief periods at any one place and decided a workable solution would be to assign RTK GPS users a set of frequencies they could use on an as-available basis.
>
> This approach works pretty well for the most part, especially when you get away from the population centers.
>
> For the last decade-plus, almost all private-sector RTK GPS users, except for permanent-base installations, have been licensed to the same set of 13 frequencies.
>
> Those 13 frequencies, or whatever is on the individual user's license, are the frequencies that are programmed into the user's radio modems. The user can select the best of those frequencies for use at a specific time and place. There is (or should be) no entry of additional frequencies in the field.
>
> The FCC does what it can to keep the software used to program frequencies into radio modems restricted to manufacturers and their authorized dealers so things do not get out of hand.
>
> Tell us how it works over there - does the spectrum-management agency license RTK GPS surveyors to a set of frequences or just one frequency? Can you use that frequency anyplace in the country?
>
> GB
Frequency selecting - not programming
This probably answers the query on my first post, Re;
https://surveyorconnect.com/index.php?mode=thread&id=174713
It appears that there are no definite government body regulating the use of GPS radio frequencies in the Philippines, I have yet to check whether our NTC (National Telecommunications Commission) is the right place to get the licenses.
Can you please share to me the frequencies you're using in your Leica GS09? The dealer where I got my equipment is not of much help in that aspect, his guess on the radio frequencies will probably be as good as mine.
Thanks a lot in advance!
amdomag, post: 174376, member: 1683 wrote: Frequency selecting - not programming
Frequency regulations in the Philippines simply doesn't work so I need that versatility in the field.
I am not a radio telecom expert and not a guru on PDL radio modems as well. In fact, I am just utilizing the modem as it was set by my supplier. When I purchased my Leica GS09, the PDL cable was not included to bring down cost. As I understand my supplier, I need the programming cable to be able to assign frequencies. I guess, these frequencies are the ones to be scanned during the AutoBase mode.
Your input is highly appreciated.
Thank you.
> I have no idea of how it works in the Philippines, but in the U.S. of A. the frequency coordinators (private organizations certified by the Federal Communications Commission to manage allocation of certain segments of radio spectrum) somehow considered the fact that most surveyors using RTK GPS would be working over unpredictable geographic areas for fairly brief periods at any one place and decided a workable solution would be to assign RTK GPS users a set of frequencies they could use on an as-available basis.
>
> This approach works pretty well for the most part, especially when you get away from the population centers.
>
> For the last decade-plus, almost all private-sector RTK GPS users, except for permanent-base installations, have been licensed to the same set of 13 frequencies.
>
> Those 13 frequencies, or whatever is on the individual user's license, are the frequencies that are programmed into the user's radio modems. The user can select the best of those frequencies for use at a specific time and place. There is (or should be) no entry of additional frequencies in the field.
>
> The FCC does what it can to keep the software used to program frequencies into radio modems restricted to manufacturers and their authorized dealers so things do not get out of hand.
>
> Tell us how it works over there - does the spectrum-management agency license RTK GPS surveyors to a set of frequences or just one frequency? Can you use that frequency anyplace in the country?
>
> GB
pre saan ka nagpa program ng Frequency mo? gamit ko R8s at R10 tapos yong Trimmark 3 ko sa US ko binili online ngayon di sila pareho ng Frequency. mao nay problema naku kay dili maka connect ang R10 rover naku.
If you have a Javad Triumph-LS, the scanner is built in.
Jim Frame, post: 433737, member: 10 wrote: If you have a Javad Triumph-LS, the scanner is built in.
hi do you have the winflash supervisor mode installer? or do you know how to create a .set file for R8s, R10 and trimmark 3 to update/change preset RF on these devices.
Emmanuel, post: 433738, member: 12658 wrote: hi do you have the winflash supervisor mode installer? or do you know how to create a .set file for R8s, R10 and trimmark 3 to update/change preset RF on these devices.
I don't. The newest Trimble receiver I own is a 4700. Most of mine are older.
Happy to be in Europe. I just switch on my rtk-gps, make the ntrip connection and am ready to go. You guys carry frequency scanners, radio links, base stations, magnetic locators, ...
We just carry a shovel:-)
Emmanuel, post: 433724, member: 12658 wrote: pre saan ka nagpa program ng Frequency mo? gamit ko R8s at R10 tapos yong Trimmark 3 ko sa US ko binili online ngayon di sila pareho ng Frequency. mao nay problema naku kay dili maka connect ang R10 rover naku.
Kumusta bai? Ininglis lang sa ta para dili lain tan-awon sa uban. Hehehe.. Anyway, this post was originally way back in 2012 I guess. At that time, I don't have the programming cable. I purchased the programming cable a few months later and now I can do what I want. I do my own programming letting GNSS from different models to see each other. I have my Leica GS09 and GS14 see each other. Given this capability, I can scale up my GNSS teams as I wish.
I also purchased a frequency scanner to help me readily identify the cleanest channel then proceed from there. It is very handy.
Regards.
Jim Frame, post: 433737, member: 10 wrote: If you have a Javad Triumph-LS, the scanner is built in.
This is great!
amdomag, post: 433872, member: 1683 wrote: Kumusta bai? Ininglis lang sa ta para dili lain tan-awon sa uban. Hehehe.. Anyway, this post was originally way back in 2012 I guess. At that time, I don't have the programming cable. I purchased the programming cable a few months later and now I can do what I want. I do my own programming letting GNSS from different models to see each other. I have my Leica GS09 and GS14 see each other. Given this capability, I can scale up my GNSS teams as I wish.
I also purchased a frequency scanner to help me readily identify the cleanest channel then proceed from there. It is very handy.
Regards.
yes.. i do have the cable to communicate for all the devices but trimble products only authorized dealer to change RF on radios. now my problem is my R8s and R10 both have the same RF which is within 430-456mhz but they can go up to 470 but, my Trimmark 3 external radio which i bought from the US is setup from 460-467mhz which has a range of 450-470mhz. meaning, i can't step-down my external radio rather i need to step-up my base and rover. the issue is at the base i can add RF but cannot be used for transmitting correction because it only allows me to use the preset RF on the R8s.
furthermore, as i read from other comments i can changed the RF for all of them if i have the winflash supervisor version which i hope somebody here can help me by sending me a copy of that software.