investigating Cannot contact ATC on VHF 38-40MHz

[draconus]

I am unable to contact any ATC on VHF 38-40.xxxMHz freq (taken from F10 map info). 100-400MHz works fine for me.

 

Not mission related nor map related. I can only test it in F-14B but user report also F/A-18C.

 

It all started in this thread but quickly spread beyond mission, map and module:

 

https://forums.eagle.ru/showthread.php?t=257644

 

@latest beta

[Rudel_chw]

I tought those frequency ranges were for the ww2 era aircrafts. The modern vhf radios dont go below 107 mhz or so. For example the fw190 radio has a range between 38.4 and 42.4 MHz.

[Quax456]

I tought those frequency ranges were for the ww2 era aircrafts. The modern vhf radios dont go below 107 mhz or so. For example the fw190 radio has a range between 38.4 and 42.4 MHz.

 

 

Yep....all VHF frequencies below 100 MHz are FM modulated.

In the old times all Radios were AM modulated.....so....you are right.

 

 

This is not a bug!

[draconus]

http://www.heatblur.se/F-14Manual/general.html#an-arc-182-v-uhf-2-radio

The ARC-182 radio provides multimode, multichannel, air-to-air/air-to-surface voice and tone communications. The ARC-182 control panel is located on the RIO left console. Frequency range extends in four bands from 30 to 88, 108 to 156, 156 to 174, and 225 to 399.975 MHz on any of 11,960 channels (separated by 25 kHz).

Hornet's ARC-210 can set 30-87MHz too.

[Quax456]

http://www.heatblur.se/F-14Manual/general.html#an-arc-182-v-uhf-2-radio

 

Hornet's ARC-210 can set 30-87MHz too.

 

 

Yes thats correct but you are mixing Modulation and Frequency Range....

 

 

In Modern models the range between 30-87MHZ is Frequency modulated (FM).

In the old Warbirds its Amplitutde Modulated(AM)

[draconus]

Even if we have a AM/FM switch?

[Frederf]

Tested with A-10C2, F/A-18. ATC frequencies in VHF FM band not allowing communication. Track demonstrates Anapa and Krymsk not responding on their advertised frequencies. Assume this applies to all modules and airfields.

RadioFMATC.trk

[BIGNEWY]

I need to check it maybe a radio specific issue, I dont remember. 

 

thanks

[Frederf]

I don't think any airplane is able to do both 38.4 AM and 38.4 FM. The F-14 AN/ARC-118 can only do the VHF 30-88 FM band.

 

Btw I just fired up the Fw-190 set to 39 MHz AM and Krymsk replied to me. DCS is doing the ~40MHz VHF band in AM not FM like it used to a couple versions ago.

[BIGNEWY]

merged threads. 

 

I am not sure this is a bug, I am looking for the answer.  

[Frederf]

Anapa ATC is responding on 38.4 MHz AM and not 38.4 MHz FM like it used to. The modulation changed.

 

Fw-190 can do it but A-10 can't.