Search found 18 matches

by Tony_AD0VC
Mon Dec 20, 2021 4:22 pm
Forum: Requests
Topic: Option to use IIR instead of FIR filters
Replies: 6
Views: 429

Re: Option to use IIR instead of FIR filters

I just looked at the filter design window again, the lengths are 1+2^n. Basically powers of 2. Ok, so it's not going to happen. Probably would not have happened anyway.

Thanks for the insight.

Tony
by Tony_AD0VC
Mon Dec 20, 2021 3:31 pm
Forum: Requests
Topic: Option to use IIR instead of FIR filters
Replies: 6
Views: 429

Re: Option to use IIR instead of FIR filters

Having not done that before myself, it wasn't apparent to me. So the length that we specify for a filter is the FFT length? Seems like that should be a power of 2. And the windowing function, also for the FFT? In my limited experience with DSP I have worked with time domain filters on several occasi...
by Tony_AD0VC
Sun Dec 19, 2021 5:29 pm
Forum: Requests
Topic: Option to use IIR instead of FIR filters
Replies: 6
Views: 429

Option to use IIR instead of FIR filters

I chase NDBs and there are many in the NDB community who prefer the 8 pole analog filters to the digital filters in SDRC. I looked into this and I believe that the reason is related to the shape of the response. The analog filter commonly used has a nominal bandwidth of about 8hz with a response tha...
by Tony_AD0VC
Thu Jul 22, 2021 1:20 pm
Forum: SDR Chat
Topic: SDR as a TX monitor? - Maybe not
Replies: 0
Views: 1201

SDR as a TX monitor? - Maybe not

I was on HF running FT8 and was noticing people struggle to copy me even when my signal was strong so I wanted to set up a monitor on my signals. At first I tried just running an AFEDRI with no antenna but I became convinced that the ugly signal was at least partially related to the AFEDRI. So I tri...
by Tony_AD0VC
Tue Jul 06, 2021 3:16 pm
Forum: Requests
Topic: Recording Scheduler File Option
Replies: 1
Views: 230

Re: Recording Scheduler File Option

Thanks!
by Tony_AD0VC
Fri Jul 02, 2021 6:18 pm
Forum: Requests
Topic: Recording Scheduler File Option
Replies: 1
Views: 230

Recording Scheduler File Option

I make overnight recordings of the NDB band using the scheduler. This results in 60 or so files in the specified directory for each night. After you have a few nights of recordings in there is becomes very cumbersome to navigate in the folder. So I started manually creating a subfolder for each nigh...
by Tony_AD0VC
Sun May 16, 2021 6:45 pm
Forum: Requests
Topic: CAT control to specific receiver
Replies: 1
Views: 248

Re: CAT control to specific receiver

After another experiment, it looks like CAT always goes to RX1 so, if that is my FT8 receiver then all is well.

Tony
by Tony_AD0VC
Sun May 16, 2021 6:38 pm
Forum: Requests
Topic: CAT control to specific receiver
Replies: 1
Views: 248

CAT control to specific receiver

When running FT8 and using SDRC as the RX, it is controlled by WSJTX via CAT and this works fine. But, if I also have a second SDRC receiver defined and I am listening to something on it and then change bands on WSJTX, the band change goes to the currently selected RX. It would be nice if CAT contro...
by Tony_AD0VC
Thu Feb 04, 2021 7:36 pm
Forum: SDR Chat
Topic: SuperSDR?
Replies: 0
Views: 1243

SuperSDR?

Just ran across this little blurb about DC-light receiver:

https://phys.org/news/2021-02-quantum-e ... ctrum.html

Tony
by Tony_AD0VC
Mon Jan 25, 2021 12:16 am
Forum: ELAD S1/S2/S3/DUOr
Topic: Console and Elad S2
Replies: 7
Views: 1890

Re: Console and Elad S2

Hmm. Just tried it with SW2 v3.033 and it behaves the same as console. The signal peaks do not move. I have an external low pass filter set for 530Khz for my NDB hobby. In the pass band of the filter, the noise floor does not move when I switch the attenuator. In the stop band where the external noi...