Bug #1615

Yaesu VX-8DR - Cannot be imported because mode NFM not supported

Added by Cody Cook over 8 years ago. Updated over 2 years ago.

Status:Closed Start date:05/06/2014
Priority:Normal Due date:
Assignee:Bernhard Hailer % Done:


Target version:chirp-daily
Chirp Version:daily Platform:All
Model affected:VX-8DR



I use Yaesu VX-8DR and I cannot import my csv of my local area into this radio because of this error. The radio does in fact support NFM.
I was reading a bug on this opened a year ago (Issue 291 (http://chirp.danplanet.com/issues/291)) and was wondering if this could be related.

What can I provide you to fix this?


VX-8DR.img (63.7 kB) Steve Bouché, 05/06/2014 09:30 pm

Associated revisions

Revision 3294:4e684d55c1d7
Added by Bernhard Hailer almost 3 years ago

[vx8] #129, #1735 (same issue): fix for incorrect channel initializations


Users complained that under certain circumstances 2m repeaters with negative
offsets were not programmed correctly and resulted in a frequency offset or
even an incorrect transmit/receive mode. Both issues #129 and #1735
essentially describe that same problem for the Yaesu VX-8. I ran into the
same issue with a VX-8DR I just got - which made me dig into Chirp

Two bytes were found to be initialized differently when manually programmed,
both were marked "unknown". After a few experiments these bytes could be
(at least partially) identified. (A side product was that I found the bit
responsible for narrowband transmit - that will be used in another patch
fixing issue #1615 to enable this radio for Chirp's "NFM" mode).

Tested with a VX-8DR.

Bernhard AE6YN


Revision 3295:53cd045bbf82
Added by Bernhard Hailer almost 3 years ago

[vx8] #1615 NFM support added

There is a 5+ years old issue which I could reproduce: the Yaesu VX-8
didn't support Chirp NFM (as in "half channel bandwidth", not as in
Yaesu's meaning: Yaesu calls the normal 25 kHz bandwidth "NFM", as
opposed to broadcast "WFM"; to achieve what's called "NFM" in Chirp,
one needs to enable "half deviation" in the VX-8).

This patch introduces Chirp NFM support to the VX-8 driver.
Tested on a VX-8DR.

Bernhard AE6YN



Updated by Steve Bouché over 8 years ago

Can confirm the bug as well with a VX-8DR.

I've performed a factory default on my radio and inserted three channels manually:

Ch 1 - 144.010 AM
Ch 2 - 144.010 WFM
Ch 3 - 144.010 FM

Downloaded the radio image via Chirp 0.4.0 and it has been attached to my comment.

Updated by Steve Bouché over 8 years ago

Forgot to specify the narrowband channel... Just in case it wasn't clear:

Ch 1 - 144.010 AM
Ch 2 - 144.010 WFM
Ch 3 - 144.010 NFM

Updated by Brandt Belknap about 8 years ago

Same issue with the Kenwood TH-F6.

I see that the TH-F6 uses FMN instead of NFM. Maybe this is the source of the problem?

Updated by Bernhard Hailer almost 3 years ago

I might have found the issue with the Yaesu VX-8 driver code, it's a single bit in memory for each channel (Yaesu calls narrow-band FM "half deviation"; what they call "NFM" is regular channel bandwidth for ham bands FM, as opposed to WFM, bandwidth used by broadcast stations). I might be able to fix this once I have a working programming environment for Chirp.

As for the Kenwood TH-F6 mentioned in post no. 3, there is no solution. Unfortunately that radio does not allow to set narrow band FM per channel: the user can only turn it on or off globally. For that radio, you must program the channels in full bandwidth, and either enable narrow band FM globally (and risk being received with too soft audio), or keep it on regular bandwidth and keep your mouth farther away from the mike when transmitting on narrow-band channels so that you don't over-deviate. Not a very good solution, but it works.

Updated by Bernhard Hailer over 2 years ago

  • Status changed from New to Feedback
  • Assignee set to Bernhard Hailer
  • % Done changed from 0 to 100
  • Chirp Version changed from 0.4.0 to daily

Updated by Bernhard Hailer over 2 years ago

  • Status changed from Feedback to Closed
  • Target version set to chirp-daily
  • Platform changed from Windows to All

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