# Rev 1.9 and FT-450D

**URL:** https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133
**Category:** Uncategorized
**Tags:** yaesu-ft-450d
**Created:** [January 9, 2025, 12:57am UTC](https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133 "2025-01-09T00:57:52Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![kk4yel](https://forum.digirig.net/user_avatar/forum.digirig.net/kk4yel/32/1645_2.png) [@kk4yel](https://forum.digirig.net/u/kk4yel)
#### Post date: [January 9, 2025, 12:57am UTC](https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133/1 "2025-01-09T00:57:52Z")

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I just bought a set of cables from digirig for the Yaesu FT450D. I bought the 1.9 digirig separately a half year ago or more. Am I understanding correctly from the user guide [https://digirig.net/digirig-mobile-rev-1-9/?srsltid=AfmBOopHzfnOTkRSgnMW\_REQjtpUozTYouGO2Au\_6aPKwaWerNfch-pN](https://digirig.net/digirig-mobile-rev-1-9/?srsltid=AfmBOopHzfnOTkRSgnMW_REQjtpUozTYouGO2Au_6aPKwaWerNfch-pN)

That I need to configure the digirig jumpers for the Duplex serial CAT with RS232 levels for it to work correctly with my FT450d ?

thank you  
-Kevin (KK4YEL)

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### Author: ![VE7IIF](https://forum.digirig.net/letter_avatar_proxy/v4/letter/v/13edae/32.png) [@VE7IIF](https://forum.digirig.net/u/VE7IIF)
#### Post date: [January 9, 2025, 1:08am UTC](https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133/2 "2025-01-09T01:08:40Z")

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I don’t have your particular rig, but if you’re looking for the CAT features, then yes you’re correct as your rig uses RS-232.

If you’re just looking for the audio to do digital modes without CAT features, then you can use **JUST** the audio cable with the DigiRig regardless of the DigiRig’s serial configuration; I’m doing this right now with my FTM-500 - audio only, no CAT, with an ICOM configured DigiRig Mobile.

**Do NOT** plug the serial cable into the DigiRig until it’s been confirmed/configured to RS-232, as the voltages are higher than the other signaling modes.

Best of luck,  
Steve VE7IIF

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### Author: ![AL0R](https://forum.digirig.net/user_avatar/forum.digirig.net/al0r/32/3721_2.png) [@AL0R](https://forum.digirig.net/u/AL0R)
#### Post date: [January 9, 2025, 3:01am UTC](https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133/3 "2025-01-09T03:01:47Z")

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> [@kk4yel](#):
>
> That I need to configure the digirig jumpers for the Duplex serial CAT with RS232 levels for it to work correctly with my FT450d ?

Yes. The 450D uses 232 levels, not TTL levels as later Yaesu’s.

Matt  
AL0R

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### Author: ![kk4yel](https://forum.digirig.net/user_avatar/forum.digirig.net/kk4yel/32/1645_2.png) [@kk4yel](https://forum.digirig.net/u/kk4yel)
#### Post date: [January 9, 2025, 3:43am UTC](https://forum.digirig.net/t/rev-1-9-and-ft-450d/5133/4 "2025-01-09T03:43:34Z")

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Thank you. Also enabled the attenuation as the audio levels out of 450d were crazy high.

Anyone else notice WSJT-X (hamlib) has issues when select 450d? I had to select plain 450 (no d) and it worked without throwing hamlib errors.