Editing FENT (section)

== Inactive frequencies ==
{| class="wikitable"
!Frequency
!Status
!Notes
|-
|'''3500 kHz'''
|Inactive
|Rare voice leaks... Last seen in 2017.
|-
|'''4635 kHz'''
|Inactive
|Previous backup frequency. Last used on 22nd July 2026.
|-
|'''4810 kHz'''
|Inactive
|FENT's morse frequency.
|-
|'''4817 kHz'''
|Inactive
|Main night CIS relay.
|-
|'''4822 kHz'''
|Inactive
|Sevastopol-Smolensk sites communication frequency. 
CW, CIS and voice possible. Very rare to catch. Noticed on 25th July 2026.
|-
|'''4840 kHz'''
|Inactive
|FENT's previous frequency. Inactive since 14th September 2026.
|-
|'''4881 kHz'''
|Inactive
|Backup frequency for nighttime.
|-
|'''5466 kHz'''
|Inactive
|Old night CIS relay. Last used in February 2019.
|-
|'''5816 kHz'''
|Inactive
|Previous FENT's morse frequency. Last used in July 2026.
|-
|'''6270 kHz'''
|Inactive
|Backup CIS relay for daytime.
|-
|'''6870 kHz'''
|Inactive
|First FENT frequency. Last used in January 2011.
|-
|'''6910 kHz'''
|Inactive
|Backup frequency. Last used somewhere in July 2026.
|-
|'''6914 kHz'''
|Inactive
|Previous FENT's morse frequency. Last used date is unknown.
|-
|'''7414 kHz'''
|Inactive
|Sevastopol-Smolensk sites communication frequency. 
CW, CIS and voice possible. Very rare to catch.
|-
|'''7991 kHz'''
|Inactive
|Main FENT frequency from 2013-2016.
|-
|'''10319 kHz'''
|Inactive
|Main FENT freq used during tx from Mars. 2016-2026.
|-
|'''16384 kHz'''
|Inactive
|Voice, CIS, etc. Used during the tx from and to Mars.
|}
There were some other frequencies used occasionally depending on propagation conditions, but they were pretty much active for a short time and abandoned. The listed ones were the most interesting and had the most leaks.