Orion Special Band Range Resistor Value Needed
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systems9000
- Posts: 1
- Joined: Sat Sep 06, 2003 1:05 am
Orion Special Band Range Resistor Value Needed
In the Dos Version of Edacs programmer, there is a band range labeled SPECIAL that allows the user to define the band range limits for any band, the secret is that it requires a special value of band determining resistor to be installed on the controller board. The controller uses this resistor to tell it what band the radio is suppposed to be and hence wont allow itself to be programmed incorrectly. The software too reads this value via the controller when programming or alignment. When the resistor is the correct value you can then do out of band programming without the usual headaches. This function will not work with the windows version however. I am in need of the value of this resistor..Thanks..Jeff
Is this 'special' resistor the same value for every band radio? ie, does a VHF low split use the same value of 'special' resistor that a Low band 35-50 would use?
Where is this resistor located on the board?
Do you have values of the regular resistors used? If not, I can open up the Orions that I have and let you know at least what the regular values are and maybe then we could at least eliminate some of the possibilities?
Where is this resistor located on the board?
Do you have values of the regular resistors used? If not, I can open up the Orions that I have and let you know at least what the regular values are and maybe then we could at least eliminate some of the possibilities?
Scott
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NorthYork21
- Posts: 7
- Joined: Tue Jul 01, 2003 5:34 am
- Location: Toronto, Ontario
The resistor is on the RF board. It is tied to a line called radio ID on the M-RK but should be similar for the Orion. It is used to identify the type of RF board the controller is mated with. The M-RK rf board schematic calls out the values (r142) for the different standard splits in a small box in the bottom left of the page. check the Orion manual for the same info, it should be in there somewhere. Tha value for the "special" bandsplit is not called out and would have to be found experimentally by some brave soul.
All I had to work with is an M-RK ant the part in question is a very small
SMD component so I just changed it once and took the results.
The results? The 150-174 M-RK now thinks it's a 136-160 radio for programming purposes. It operates down to 145 so it wont TX the 144
repeater inputs but works fine for my purposes.
Also since the hex values for the freq in the code plug represent the number of steps from the base freq (136) so I was able to hex edit a freq set to allow me to rx the weather freqs (162.xx) on this 136-160 radio. I didn't really document the procedure well so dont ask, but if anyone needs the freq set file for their 136-160 radio I can email it. Note that Programmer wont allow the hex edited file to be loaded it stops with an error you must use EDACS3 to do this.
Of course if we had the secret value of the "special" bandsplit this hex editing would be unecessary and the radio would operate ~145-174 but the M-RK rf board is too small to be playing around with resistors even with the proper equipment, what we need here is some "inside info" to get this stuff going on the ham bands and be used for recieving other stuff also.
Chris
N9LLO
All I had to work with is an M-RK ant the part in question is a very small
SMD component so I just changed it once and took the results.
The results? The 150-174 M-RK now thinks it's a 136-160 radio for programming purposes. It operates down to 145 so it wont TX the 144
repeater inputs but works fine for my purposes.
Also since the hex values for the freq in the code plug represent the number of steps from the base freq (136) so I was able to hex edit a freq set to allow me to rx the weather freqs (162.xx) on this 136-160 radio. I didn't really document the procedure well so dont ask, but if anyone needs the freq set file for their 136-160 radio I can email it. Note that Programmer wont allow the hex edited file to be loaded it stops with an error you must use EDACS3 to do this.
Of course if we had the secret value of the "special" bandsplit this hex editing would be unecessary and the radio would operate ~145-174 but the M-RK rf board is too small to be playing around with resistors even with the proper equipment, what we need here is some "inside info" to get this stuff going on the ham bands and be used for recieving other stuff also.
Chris
N9LLO
Out Of Band Orions
On VHF Orions the resistor is R480
For 136-153Mhz (switchable radios) the value is 1.6K
For 150-174Mhz (switchable radios) the value is 3.3K
No resistor makes it think its a 900Mhz radio
You will need to adjust the VCOs
I had to pad the TX VCO
Works great!
Fowler
For 136-153Mhz (switchable radios) the value is 1.6K
For 150-174Mhz (switchable radios) the value is 3.3K
No resistor makes it think its a 900Mhz radio
You will need to adjust the VCOs
I had to pad the TX VCO
Works great!
Fowler
Out Of Band Orions
If you would parrallel the 3.3K resistor (R480) with another 3.3K resistor you get a 136-160Mhz orion
You will need to tune the VCOs (I had to pad the tx VCO)
You will then need to hex edit the software to get the freqs above 153Mhz
If you read it with Programmer software it will show the bandsplit as 136-160Mhz But you cant program it above 153Mhz without a hex edit
Fowler
You will need to tune the VCOs (I had to pad the tx VCO)
You will then need to hex edit the software to get the freqs above 153Mhz
If you read it with Programmer software it will show the bandsplit as 136-160Mhz But you cant program it above 153Mhz without a hex edit
Fowler
