Mike, I have had both 2m and 70cm repeaters (at the same time) on my main tower with no problems to the wireless.
I have had tremendous problems with "noise" on vhf frequencies. I can take my 2m mobile and pull up close to a tower and start scanning the band and it will lock onto a frequency showing full scale on the meter but no one is using the frequency. There is just a high pitched squealing that comes from the radio. Most of the time the squelch will not even open but the s-meter will show almost full scale. I had a vhf fiberglass antenna mounted to the top of a 160ft tower right above my wireless gear and it would be worse that just a small mobile antenna in the shack. I could turn off the wireless equipment and the "noise" would go away. I knew the wireless was causing some kind of interference but I did not know what it was. I made sure I had all shielded cat5 cable and made sure it was grounded at the base of the tower. This did not make any difference. I used all metal enclosures for the wireless and make sure they are grounded. Nothing would get rid of the "noise" short of turning off the wireless. Oh, this problem is not constant. It shows up on multiple frequencies but not always on the same frequencies and not every day or not all day long. I figure is is digital spurious emissions from the wireless rf. So not problems to you, just possible problems for the Hams. LaRoy McCann , N5OHO Data Technology AJ wrote: > Depends on the band... For UHF 440 MHz, the split is usually 5 MHz (same as > LMR in the UHF band). For VHF 144 MHz, the split in the US is 600 KHz (0.600 > MHz). > > Typical voice channel bandwidth is under 20 KHz for wideband and less than > 12.5 KHz for narrowband operation... A far cry from the 5 and 10 MHz > channels of 802.11x operation :) > > On Tue, Oct 27, 2009 at 11:39 AM, Mike <m...@aweiowa.com> wrote: > > >> Josh: >> >> Amateur operators, besides talking world wide on HF frequencies, have >> primary allocations in various slots in the spectrum. Besides 440 >> (UHF) there is 144 MHz (2 meter VHF), and 220 MHz (VHF). 2 meter and >> 70 cm repeaters are common in the ham world. What happens is an >> operator is able to talk to the repeater on the input frequency, and >> the equipment transmits on another frequency. So, low powered hand >> held devices (or mobile devices) can talk a great distance with low >> power, THROUGH the repeater instead of station-to-station, which >> would be simplex. The repeater equipment we are using has a built-in >> cavity so the same coax and antenna can be used for transmit and >> receive at the same time. There is a 6MHz separation between >> transmit and receive frequencies. >> >> Mike >> >> At 12:29 PM 10/27/2009, you wrote: >> >>> Can you please explain "2 meter ham gear"? >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> Suite 1337 >>> Troy, OH 45373 >>> >>> "When you have eliminated the impossible, that which remains, however >>> improbable, must be the truth." >>> --- Sir Arthur Conan Doyle >>> >>> >>> On Tue, Oct 27, 2009 at 10:37 AM, Kurt Fankhauser <k...@wavelinc.com> >>> >> wrote: >> >>>> In my experiences with 2 meter ham gear that is around Ethernet there >>>> >> is a >> >>>> lot of interference from the Ethernet to the ham guys stuff. I've never >>>> seen >>>> the ham guys cause interference though to any wifi gear. >>>> >>>> Ham guys are a whole different breed of folk and depending on how these >>>> ones >>>> your talking to are they may be an invaluable asset to you or they may >>>> >> be >> >>>> your worst nightmare. The ones around my area are the later and anyone >>>> >> that >> >>>> gets involved with them end up regretting it later down the road. >>>> >>>> Just my 2 cents, >>>> >>>> Kurt Fankhauser >>>> WAVELINC >>>> P.O. Box 126 >>>> Bucyrus, OH 44820 >>>> 419-562-6405 >>>> www.wavelinc.com >>>> >>>> >>>> -----Original Message----- >>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >>>> >> On >> >>>> Behalf Of Mike >>>> Sent: Tuesday, October 27, 2009 9:17 AM >>>> To: WISPA General List >>>> Subject: [WISPA] Amateur repeater on a wisp tower -- gotchas? >>>> >>>> Wispers: >>>> >>>> I have a 180' tower sitting high on a hill above the county seat. It >>>> has a mix of 5.8 and 2.4 radios and sectors/dishes. We want to >>>> install an amateur repeater on the tower, initially at 70 cm (440MHz >>>> UHF), and eventually a 2 m (144MHz VHF) radio. The dual band antenna >>>> feed point will be at 120'. It is 17' long. There is no microwave >>>> equipment below 160'. >>>> >>>> I don't think there will be any issues with interference either way, >>>> but thought I'd tap into the wealth of knowledge here to see if any >>>> of you has any experience doing anything like this on your towers. >>>> >>>> Is there any mixing at uhf (or VHF) going on in the microwave radio >>>> cards? I can't find specs that even speak of intermediate >>>> frequencies. Gotchas? Hints? Comments? >>>> >>>> Thanks! >>>> >>>> Mike G >>>> >>>> At 06:38 PM 10/26/2009, you wrote: >>>> >>>>> My 24 hours is expiring and I don't want to pull this unit down. >>>>> Mikrotik's site wants me to authorize my credit card, a process I've >>>>> begun but my credit card company won't post the transaction for a few >>>>> days. Can anyone sell me a level 4 license for an x86 machine now? >>>>> >>>>> Thanks! >>>>> Greg >>>>> >>>>> >>>>> >>>>> ----------------------------------------------------------------- >>>>> >>> ---------- >>> >>>> ----- >>>> >>>>> WISPA Wants You! Join today! >>>>> http://signup.wispa.org/ >>>>> >>>>> ----------------------------------------------------------------- >>>>> >>> ---------- >>> >>>> ----- >>>> >>>>> WISPA Wireless List: wireless@wispa.org >>>>> >>>>> Subscribe/Unsubscribe: >>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>> >>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>> >>>> >>>> >>>> >>>> >>>> >> ---------------------------------------------------------------------------- >> >>>> ---- >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> >>>> >>>> >> ---------------------------------------------------------------------------- >> >>>> ---- >>>> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>>> >>>> >>>> >>>> >>>> >> -------------------------------------------------------------------------------- >> >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> >>>> >>>> >> -------------------------------------------------------------------------------- >> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! 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