Well, the image you show must not be of a simplex channel (same RX and TX frequency) because in my software when I enter the same RX and TX frequency the "TA Direct/Talkaround" check box field is greyed out and not accessable.
It is in that situation that I am asking how the NAC codes behave.
I guess what I am asking is this... in the situation above where the "TA Direct/Talkaround" check box field is greyed out - does it use the two seperate NAC codes or does it get too smart for its own good and transmit the RX code?
NOTE:
I am using different radios to test these scenarios and getting different results.
XTS5000
APX7500
EJF5100
On the image I posted that was using the same RX and TX freqs. in a simplex situation.
The test personality I used to take that screen shot was setup as follows. BTW the entry is too long to take a continuous screen shot. So, I decided to focus on that particular area. I might be able to piece something together to show the whole thing.
I made a new conventional personality and set it for ASTRO. Went into the Zone/Channel window entered 136.075 as both the RX and TX frequency. Then entered your NACs as given. I also tested the function of this and various other setups on a XTS 5000, and came up with the results I posted previously.
Now if you start with just a default entry like I did and enter the same freqs. for RX and TX the "TA Direct/Talkaround" check box will be greyed out, and the Direct NAC box too. But if you change the TX or RX NACs those boxes will "ungrey" unless you enter the the same NACs for RX and TX.
The following screen shots were taken using a RX and TX frequency of 136.075.
The first one shows what the screen looks like unchanged from default NACs.
The second shows what the screen looks like with your NACs entered.(Using this setup on a XTS5000 will result in the radio TX and RX a NAC of 392 consistently.)
And the third shows what the screen looks like if you enter any NAC as both the RX and TX NAC.
The fourth screen shot shows the setup with the TA box checked. This is the setup where you would NOT hear the other radios on simplex unless you hit your direct button.
I'm also including a XTS5000 codeplug I grabbed from the super site, and have entered some "test" channels for you to look at. Just go to the Zone/Channel area and you can see the entries. The first is DEFAULT which is what it would be if all you did was change the freqs to be the same RX and TX. The second shows what it looks like with your NACs entered as you described. The third shows what it looks like with your NACs and you were to check the TA box. The fourth and fifth show what it looks like when any NAC is entered for both RX and TX on a simplex channel, but I used your two NACs to demonstrate for ease.
In regard to "I guess what I am asking is this... in the situation above where the "TA Direct/Talkaround" check box field is greyed out - does it use the two seperate NAC codes or does it get too smart for its own good and transmit the RX code?"
If you were to enter a TX NAC of 001 and a RX NAC of 392 as you have stated. And NOT check the "TA Direct/Talkaround" check box the radio will ignore the TX NAC of 001 and use the NAC of 392 for TX and RX.
The reason it acts this way is if you have entered the same freq. for TX and RX, and don't check the "TA Direct/Talkaround" check box the radio assumes you mean for that channel to be direct all the time. Which is what its supposed to do. However, I'm still puzzled as to you getting the boxes you mentioned greyed out if the NACs are entered the way you say they are.
If I haven't explained this well enough or you have more questions anyway. You can send me your codeplug if you'd like and I'll gladly take a look at it for you. And of course you can respond back to here or send me a PM.
I do what I can to help out.
