ARC-UD radio confusion, why the VHF/UHF switch and other questions.

[Snappy]

Hi,

somehow I find the ARC-UD radio for homing very confusing in its setup and the manual didnt really help it getting it clearer.

As for as I understood it, the 6 channels on the panel are fixed and preselected, the first 5 being VHF frequencies and the last, No.6 , being 243 AM. 

So why is there the VHF/UHF selector switch? (Switch Number 7) on the picture. It seems unnecessary ,since the selection of the channel already determines whether I scan for VHF or UHF. 

 

Also, another question , something else which is not clear,  for homing, how does the ARC-UD determine, whether I want to home on one of the ARC-UD's  6 preselectable channels or whether I want to home on one of the channels of the 10 channels of the R-828 radio?

You can't really unselect the 6 channels of the ARC-UD (selector no.3 on the picture) ?

Last question , regarding Switch No.2 in the picture: Is "high sensivity" the up or down position? Does it make any difference in DCS?

Thank you ,

kind regards,

Snappy

 

 

Edited December 22, 2021 by Snappy

[sLYFa]

All six channels are VHF channels. The 7th channel (241mhz) is selected by setting switch number seven down. In this case, the channel selector has no effect. 

If you want to home on an r828 signal, you need to turn on compass mode on the r828 panel. IIRC the ARC-UD needs to be on for that too. 

High sensitivity is the up position (Б=большая). Dont know if the difference is modelled though, same with the УП/ШП selector

Edited December 22, 2021 by sLYFa

[Snappy]

56 minutes ago, sLYFa said:

All six channels are VHF channels. The 7th channel (241mhz) is selected by setting switch number seven down. In this case, the channel selector has no effect. 

If you want to home on an r828 signal, you need to turn on compass mode on the r828 panel. IIRC the ARC-UD needs to be on for that too. 

High sensitivity is the up position (Б=большая). Dont know if the difference is modelled though, same with the УП/ШП selector

 

Thank you for your answer slYFa.

There are six not seven channels on the selector and according to the manual channel 6 is  UHF 243.00.

Not sure which channel 7 you mean?

Regarding the R-828 homing. Yes I think the ARC UD needs to be on for that too .But setting the compass mode to ON is what overrides the channel selection on the overhead panel?

thank you ,

regards Snappy

 

[sLYFa]

What I mean is that there are seven channels in total: Six of them are selectable via the rotary and the seventh is activated by placing switch no.7 to UHF, in which case the rotary selection is overridden.

Placing r828 into comp mode should also override ARC UD channel selection, I',m not 100% sure though, been a while since I used that.

Edited December 22, 2021 by sLYFa

[Snappy]

18 minutes ago, sLYFa said:

What I mean is that there are seven channels in total: Six of them are selectable via the rotary and the seventh is activated by placing switch no.7 to UHF, in which case the rotary selection is overridden.

Placing r828 into comp mode should also override ARC UD channel selection, I',m not 100% sure though, been a while since I used that.

 

Sorry sLYFa, you were completely right, I just read the specific part in the manual again, not sure how I could read it that wrong, it is really like you said :

All six channels selectable on the overhead dial are VHF and putting switch No. 7  (in my original post) down, selects UHF mode &   the seventh channel , the only UHF one,  which is UHF 243.00 Mhz.

If you do  that, it doesnt matter which channel you select with the dial.

I guess the last part had me confused somehow, as I wasnt exactly sure how to access the UHF frequency. Thanks to you its much clearer now.

Thanks a again for your kind help! 
 
Kind regards,

Snappy

Edited December 22, 2021 by Snappy