Gnuradio-companion: set value to None

GNU Radio
1

For example, when there is if tau is not None: in fm_demod.py, and
you
want to put None for tau in gnuradio-companion “FM Demod” block, what do
you put into the properties dialog for FM demod block?

If I want no filtering of any kind…
I also wonder about another block for FM demod, perhaps Quadrature demod
block?

2

On 04/02/2012 09:16 AM, wayne roberts wrote:

For example, when there is if tau is not None: in fm_demod.py, and you
want to put None for tau in gnuradio-companion “FM Demod” block, what do
you put into the properties dialog for FM demod block?

If I want no filtering of any kind…
I also wonder about another block for FM demod, perhaps Quadrature demod
block?

2 thoughts on this

Maybe it would be a good idea in general for grc param entries to simply
accept None. That is, bypass the whole type checking when “x is None”.

Also, perhaps a simple patch is in order, then set tau to zero. I assume
thats out of the acceptable range:

diff --git a/grc/blocks/blks2_fm_demod_cf.xml
b/grc/blocks/blks2_fm_demod_cf.xml
index 2ce1fb9…89b5d23 100644
— a/grc/blocks/blks2_fm_demod_cf.xml
+++ b/grc/blocks/blks2_fm_demod_cf.xml
@@ -15,7 +15,9 @@
audio_pass=$audio_pass,
audio_stop=$audio_stop,
gain=$gain,
+#if $tau()
tau=$tau,
+#end if
)

Channel Rate

-josh