Rockwell Collins - 8.33 VHF Comm
Part Number :

  • Proline II remote-mounted, multichannel VHF voice transceiver providing AM voice communications in the frequency range from 118.000-136.975 in 8.33 kHz increments
  • Can be used with Proline II CTL-22C control
  • Accept either 2-out-of-5 parallel or RS-422A serial digital tuning data from frequency control unit
  • Versions available with improvements for reduction VHF harmonics level in GPS band to prevent los of GPS satellite reception when in VHF transmit mode
  • Versions available with improvements for reduced low-frequency transmitter input audio response
Weight: 5.6 lbs. Dimensions: 3.750"W x 3.50"H x 13.9"L
Related documents: DO-138, Env Category AD/A/JNG/ AAAEXXXXX; TSO C37b and C38b, class 1, FCC rules and regulations, parts 15 and 87 Temperature: -65 to +131 C
Altitude: 55000 ft. max. Shock: 6 g for 11 ms, operating
Frequency Range: 117.000 to 136.975 MHz Frequency stability: +-0.0015%
Channel Spacing: 25 kHz Frequency control: 2-out-of-5, in accordance w/ ARINC 410
Channel change time: Less than 50 ms Transmit-receive interval: Less than 50 ms
Radiated rfi: Meets RTCA Paper DO-138, DO-109, DO-110 RF power output: 20 watts nominal; 16 watts minimum
Output impedance: 52 ohms, unbalanced Harmonic Content: 60 dB down from carrier minimum
Spurious content: 90 dB from carrier minimum Modulation capability: 90% amplitude modulation
Modulator input: Carbon mic input 0.125 V adjustable, 150 ohms Sidetone output: 100 milliwatts into 600 ohms with 90% modulation
Duty cycle: 1-minute transmit; 4-minute receive Noise level: 50 dB below 85% modulation at 1000 Hz
Audio response: 6-dB variation from 300 to 2500 Hz Audio distortion: 15% max, 85% modualtion
AGC range: Maximum 3-dB variation, 5 to 200,000 uV Receiver audio output: 100 mW into 600 ohms, balanced
Receiver audio response: 6-dB variation from 300 to 2500 Hz, 1000-Hz reference Receiver audio distortion: 7% max, 30% modulated signal
Part Number VHF Communications Transceiver Description:
822-1113-001 Basic unit with details listed above
822-1113-021 Includes filtering for GPS as detailed above
822-1113-023 Includes filtering for GPS and reduced low frequency transmitter input audio response


- 8.33 VHF Comm

NSN: 5821-01-587-6175

Price Condition Delivery

SEA Repair Capabilities: Yes

- 8.33 VHF Comm
Price Condition Delivery

SEA Repair Capabilities: Yes

- 8.33 VHF Comm
Price Condition Delivery

SEA Repair Capabilities: Yes

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact questions@seaerospace.com

Yes. Because the VHF-22D is an extended range VHF comm radio, the CTL-22C control must be strapped to either allow or not allow operation above 135.975 MHz. That is, if it is desired that the VHF-22D only function in the VHF-22C frequency range, then the CTL-22C connection for ext. range (P1 little m to be exact) should not be grounded. Likewise, P1 m connection should be grounded when operation above 135.975 is desired.
8.33 refers to the kilohertz (kHz) channel spacing for VHF communications radios required in certain types of airspace. Normal channel spacing for VHF comm radios is 25 kHz. Currently, 8.33 kHz channel spacing is only required above FL195 (19500 ft.) in the ICAO European region as of 15 March 2007.

8.33 channel spacing was introduced and implemented to help reduce VHF communication overlap and congestion in high traffic areas in Europe. With dividing 25 kHz by 3 (thus 8.33), many new communication frequencies were created. Only very specific radio equipment is capable of channeling, transmitting, and receiving in 8.33 kHz increments. Some of the more popular systems include the Rockwell Collins VHF-21/22/422/C/D and Bendix/King KX-165A (-0201), KY-196B. The Garmin GNS-430/530 series systems are capable of 8.33 also.

The VHF-22C is only a direct replacement for the VHF-22A 25 kHz comm. The VHF-22C is not a direct replacement for the VHF-20A or VHF-21A radios as they have different mating connector styles. The VHF-22D is a direct replacement for the VHF-22B.

Southeast Aerospace exchanges are based on the return of an undamaged, economically repairable core unit with identical part number as the unit shipped to the customer. An "economically repairable" core is defined as one where the cost to repair/overhaul (or Repair Cap) does not exceed 80% of the original SV/OH exchange price billed. Should the Repair Cap exceed 80%, the customer will be billed the additional amount. In the event this amount exceeds the Outright Price for the unit, the customer would only be billed the difference between the Outright Price and SV/OH Exchange Price with the core returned as-is to the customer.

Here is an example of such a transaction:

$1000 Exchange Price charged to customer
$1000 x .8 = $800 Maximum Allowable core repair charge or Repair Cap

$2000 Cost to repair core unit
- $800 Less Core repair cap
$1200 Additional billing amount.

2200.00 Total Cost of transaction

Please Note:
SEA offers exchange on new items as well. However, repair cap as indicated above is still based on SV/OH exchange price.