I am working for a land surveying company and we use Trimble products and Trimble uses Pacific Crest radios for data transmission. Right now we are looking for new radios that would be compatible with Trimble that can transmit GMSK 9600, 4800 baud. We need to upgrade because Pacific Crest sucks we lose signal all the time and we have nothing but constant radio problems with this system. Is there anything out there that can transmit in the 440 to 460 Mhz range that does this? The Trimble that we have is the R8 base and rover GPS surbeying equipment. We are looking for something high qualtiy that doesn't bleed over into other frequencies and that will scan around and automatically find an open frequency.
Data transmission
- Thread starter Astrak
- Start date
- Status
Al42
Member
That's probably illegal. You're licensed for one, or a few, frequencies and you use them and only them.Astrak said:
Oh, and radios that are type-approved don't "bleed over". "Bleeding over" would cause them to fail type approval.
Oh not really, the radios do bleed over I have scanner and can pick up the frequencies around the frequency that is being used and it does over modulate. Also no it's not illegal we have an FCC license to transmit on 10 frequencies in the 440 to 460 Mhz band. It's ok though I found some products better than Pacific Crest they are Teledesign and Keltronics. Oh and I took that as sarcasm ********(sorry if your not being sarcastic) and I don't know why that would be but it's not appreciated so <sarcasm> thanks for the help.
[Mod Edit: Suppose you assume most people are here to help and not hinder. Also assume that your 8 year old daughter is reading this and if you don't have one, assume somone's 8 year old daughter is reading this; watch the langauge.]
[Mod Edit: Suppose you assume most people are here to help and not hinder. Also assume that your 8 year old daughter is reading this and if you don't have one, assume somone's 8 year old daughter is reading this; watch the langauge.]
Last edited by a moderator:
RISC777
Member
- Joined
- Oct 19, 2005
- Messages
- 929
I have that situation when scanning public safety VHF and UHF. Just saying that I experience that myself. [No sarcasm intended or inferred.Astrak said:
]Examples: One is a UHF system - 453.9500, the other is a VHF - 153.8900.
How close is the scanner when that happens in your situation?
Hi Astrak and all,
"Oh not really, the radios do bleed over I have scanner and can pick up the frequencies around the frequency that is being used and it does over modulate."
One of two possibilities, your scanner lacks selectivity (none can approach that of comercial receivers) or the transmitters are over-deviating. If it's the latter it could be why the system's not operating properly, it simply ISN'T operating properly. If the transmitters are deviating outside the passband of the receivers signals are being clipped, data being lost. Send the rigs to the shop for testing and possible adjustment.
"Oh not really, the radios do bleed over I have scanner and can pick up the frequencies around the frequency that is being used and it does over modulate."
One of two possibilities, your scanner lacks selectivity (none can approach that of comercial receivers) or the transmitters are over-deviating. If it's the latter it could be why the system's not operating properly, it simply ISN'T operating properly. If the transmitters are deviating outside the passband of the receivers signals are being clipped, data being lost. Send the rigs to the shop for testing and possible adjustment.
- Status
