Topics

Frequencies, Band Plans and other annoyances

"k7udr" <bhhoyer@...>
 

As we move forward to deployment, it occurs to me that the landscape for operating frequencies is anything but stable.

Here in Western Washington we have 19 - 25kHz simplex channels designated as packet, of which only 3 are contiguous, such that we could use them as a 100kHz high speed channel.

We also have 3 pairs designated as packet repeaters.

What are your thoughts on how to deploy the UDR in your area, particularly once we move past the current 4800 NB and 9600 baud rate limitations.

Bryan - K7UDR

PE1RDW <pe1rdw@...>
 

On Wed, 05 Jun 2013 21:46:23 +0200, k7udr <bhhoyer@...> wrote:

As we move forward to deployment, it occurs to me that the landscape for operating frequencies is anything but stable.

Here in Western Washington we have 19 - 25kHz simplex channels designated as packet, of which only 3 are contiguous, such that we could use them as a 100kHz high speed channel.

We also have 3 pairs designated as packet repeaters.

What are your thoughts on how to deploy the UDR in your area, particularly once we move past the current 4800 NB and 9600 baud rate limitations.

Bryan - K7UDR
In europe it should be no problem, region one has about 200 khz for duplex/relais packet, 400 khz simplex packet, and 3 all mode sections, one 500 khz, one 400 khz and one 600 khz, offcourse the all mode section are also used for wide band fm communication so might not always be available but are still often the best suited because in the simpelx and duplex packet sections are still a lot of laps active at 9k6

--
73 Andre PE1RDW

"avignonmimi@..." <avignonmimi@...>
 

East and West coasts could be a problem with Navy/USAF radars. The USAF created a UHF ham-free zone around the west coast Pave Paw radar.

Kantronics built their data radio for the 430 band back in the 90's, to keep it out of narrow band repeater space. Most common catalog ham antennas are cut for 440 though, so you had to buy more expensive satellite antennas, or build your own.

It would be nice if someone made a circular polarized antenna with a left or a right pattern, so they could be used terrestrially.

--- In UniversalDigitalRadio@..., "k7udr" <bhhoyer@...> wrote:

As we move forward to deployment, it occurs to me that the landscape for operating frequencies is anything but stable.

M5AKA <m5aka@...>
 

--- On Sat, 8/6/13, avignonmimi@... <avignonmimi@...> wrote:
It would be nice if someone made a circular polarized antenna with
a left or a right pattern, so they could be used terrestrially.
The only problem might be whether to use Left or Right circular as there's 30 dB's attenuation between the two.

The IARU recommends using Right-hand Circular, see 8.8.7 of the VHF Handboook at
http://www.iaru-r1.org/index.php?option=com_remository&Itemid=173&func=fileinfo&id=178

Circular antennas are available from Wimo
http://www.wimo.de/helix-antennas_e.html

73 Trevor M5AKA

"brad_ka3yan" <bradm75@...>
 

Bryan,

I'm in the Charleston, SC area. While I haven't had any issues personally with channelization in the 70cm band, I would have to consult with the governing body before I open my mouth and say something wrong. The South Eastern Repeater Association (SERA) handles frequency coordination in my area.

Their website states:

439.6000 - 440.4750 FM Digital/Packet Operation
440.5125 - 440.7250 NB Digital Repeater Outputs/Duplex Backbones/Link
440.9125 - 441.1750 Simplex Digital
445.0250 - 445.4750 Digital
445.5125 - 445.7250 Digital Repeater Inputs
446.5000 Simplex Digital

Narrow Band FM Digital/Packet Repeater or Digital/Packet
Duplex Backbone
18 Duplex Channels, 12.5 KHz split, 5 MHz split, High input - Low output
445.5125 - 440.5125 445.5250 - 440.5250 445.5375 - 440.5375
445.5500 - 440.5500 445.5625 - 440.5625 445.5750 - 440.5750
445.5875 - 440.5875 445.6000 - 440.6000 445.6125 - 440.6125
445.6250 - 440.6250 445.6375 - 440.6375 445.6500 - 440.6500
445.6625 - 440.6625 445.6750 - 440.6750 445.6875 - 440.6875
445.7000 - 440.7000 445.7125 - 440.7125 445.7250 - 440.7250

Wide Band Digital/Packet Duplex Backbones/Links
19 Duplex, Mixed 50/100 KHz, 5 MHz split, High input, Low output,
horizontal or vertical polarization optional
445.0250 - 440.0250 445.0500 - 440.0500 445.0750 - 440.0750
445.1000 - 440.1000 445.1250 - 440.1250 445.1500 - 440.1500
445.1750 - 440.1750 445.2000 - 440.2000 445.2250 - 440.2250
445.2500 - 440.2500 445.2750 - 440.2750 445.3000 - 440.3000
445.3250 - 440.3250 445.3500 - 440.3500 445.3750 - 440.3750
445.4000 - 440.4000 445.4250 - 440.4250 445.4500 - 440.4500
445.4750 - 440.4750

Narrow Band FM Digital/Packet Simplex
440.9125 440.9250 440.9375 440.9500 440.9625 440.9750
440.9875 441.0000 441.0125 441.0250 441.0375 441.0500
441.0625 441.0750 441.0875 441.1000 441.1125 441.1250
441.1375 441.1500 441.1625 441.1750

Let me just say, the band is not crowded here. I'm actually operating my Winlink 9600bps Packet RMS out of the band plan in 441.050, but its because my radio is crystalled for that freq. I haven't gotten any complaints and I seriously doubt I will. Like I said, this area is not heavily trafficed in the 70cm band.

73,
Brad, KA3YAN

--- In UniversalDigitalRadio@..., "k7udr" <bhhoyer@...> wrote:

As we move forward to deployment, it occurs to me that the landscape for operating frequencies is anything but stable.

Here in Western Washington we have 19 - 25kHz simplex channels designated as packet, of which only 3 are contiguous, such that we could use them as a 100kHz high speed channel.

We also have 3 pairs designated as packet repeaters.

What are your thoughts on how to deploy the UDR in your area, particularly once we move past the current 4800 NB and 9600 baud rate limitations.

Bryan - K7UDR

"Douglas" <dperv27@...>
 

Here in Connecticut, we don't have a published 70cm Band Plan. I've asked for our Spectrum Manager for his input, but he is out of town on business and will discuss with me when he returns. I suggested we adopt the Northern California Band Plan:

http://ncpa.n0ary.org/overall_70_cm_band_plan.pdf

More info to follow..

--73 de N1OBU (Doug)(FN41AN)

--- In UniversalDigitalRadio@..., "k7udr" <bhhoyer@...> wrote:

As we move forward to deployment, it occurs to me that the landscape for operating frequencies is anything but stable.

Here in Western Washington we have 19 - 25kHz simplex channels designated as packet, of which only 3 are contiguous, such that we could use them as a 100kHz high speed channel.

We also have 3 pairs designated as packet repeaters.

What are your thoughts on how to deploy the UDR in your area, particularly once we move past the current 4800 NB and 9600 baud rate limitations.

Bryan - K7UDR

"avignonmimi@..." <avignonmimi@...>
 

I was thinking one station could have right-hand, but then to communicate the next station would need left-hand (two antennas pointed at each other).

Wimo only sells right-hand, as they sell to the satellite market, where only the satellite needs to be left-hand.

--- In UniversalDigitalRadio@..., M5AKA <m5aka@...> wrote:

Circular antennas are available from Wimo
http://www.wimo.de/helix-antennas_e.html

73 Trevor M5AKA