DSP audio processing
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John Fell
Has anyone done much with add-on DSP for older generation prime movers RX such as the IC746 ? That has an early DSP attempt but has no doubt been surpassed by most SDRs etc . I am looking ideally for a module that would take standard LS level from the rig , process the audio with setup options and output as a speaker level at around 2W . I have found off the shelf boards , at a price , but was hoping for some reduction in my pension contribution .... This is for USB audio use on the G4RFR 10GHz EME system , where it would help to more closely define and de-noise incoming SSB . 73 John G0API |
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ian hope (2E0IJH)
Only the BHI modules but they not cheep, but they worth the money in my opinion
Ian
M5IJH Sent: Monday, January 30, 2023 at 4:28 PM
From: "John Fell" <john.g0api@...> To: "UK Microwaves groups.io" <ukmicrowaves@groups.io> Subject: [UKMicrowaves] DSP audio processing Has anyone done much with add-on DSP for older generation prime movers RX such as the IC746 ?
That has an early DSP attempt but has no doubt been surpassed by most SDRs etc .
I am looking ideally for a module that would take standard LS level from the rig , process the audio with setup options and output as a speaker level at around 2W .
I have found off the shelf boards , at a price , but was hoping for some reduction in my pension contribution ....
This is for USB audio use on the G4RFR 10GHz EME system , where it would help to more closely define and de-noise incoming SSB .
73
John
G0API
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John Fell
Thanks Ian . 73 John On Mon, 30 Jan 2023 at 16:37, ian hope (2E0IJH) <ian@...> wrote:
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Colin Ranson
Hi John,
I am disappointed with the BHI In-Line module I bought a little while ago, insofar as it does its job very well, but when coming off transmit it takes about a half second to ‘re-process’ the newly presented noise from the RX resulting in a huge crash of noise in the speaker/headphones – very uncomfortable. No amount of level tweaking will overcome this. I have not spoken to BHI yet. I have a friend who has a XIEGU GNR-1 that does exactly the same thing.
Incidentally I still have my IC-746 from new (1998) and have always found the NR very good on 6m/2m.
I too would like a NR add-on for my IC-375 and IC-275e, been thinking about a ‘Teensy’ but thinking is all I’ve done.
Regards
Colin de G8LBS.
Sent from Mail for Windows
From: John Fell
Sent: 30 January 2023 16:29 To: UK Microwaves groups.io Subject: [UKMicrowaves] DSP audio processing
Has anyone done much with add-on DSP for older generation prime movers RX such as the IC746 ? That has an early DSP attempt but has no doubt been surpassed by most SDRs etc . I am looking ideally for a module that would take standard LS level from the rig , process the audio with setup options and output as a speaker level at around 2W .
I have found off the shelf boards , at a price , but was hoping for some reduction in my pension contribution .... This is for USB audio use on the G4RFR 10GHz EME system , where it would help to more closely define and de-noise incoming SSB .
73 John G0API
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John Fell
Thanks for your comments Colin . Andy JNT was just on the blower and he said it was worth a play again with the 746 onboard DSP - mine had stood in the shack for several years before it was press ganged into EME use , mainly as it had CAT control for WSJT uses . I guess an external speaker would help .......LOL. I do have some BHI NCH headphones in my shack and they seem to work usefully . 73 John G0API On Mon, 30 Jan 2023 at 16:49, Colin Ranson <g8lbs@...> wrote:
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ian hope (2E0IJH)
I've got the older version of this, https://bhi-ltd.com/products/noise-cancellation-products/pcb-modules-amplified-audio/79-nedsp1962-kbd.html, built into a speaker and not had any issues, as described by colin
Ian
M5IJH Sent: Monday, January 30, 2023 at 4:49 PM
From: "Colin Ranson" <g8lbs@...> To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io> Subject: Re: [UKMicrowaves] DSP audio processing Hi John,
I am disappointed with the BHI In-Line module I bought a little while ago, insofar as it does its job very well, but when coming off transmit it takes about a half second to ‘re-process’ the newly presented noise from the RX resulting in a huge crash of noise in the speaker/headphones – very uncomfortable. No amount of level tweaking will overcome this. I have not spoken to BHI yet. I have a friend who has a XIEGU GNR-1 that does exactly the same thing.
Incidentally I still have my IC-746 from new (1998) and have always found the NR very good on 6m/2m.
I too would like a NR add-on for my IC-375 and IC-275e, been thinking about a ‘Teensy’ but thinking is all I’ve done.
Regards
Colin de G8LBS.
Sent from Mail for Windows
From: John Fell
Has anyone done much with add-on DSP for older generation prime movers RX such as the IC746 ? That has an early DSP attempt but has no doubt been surpassed by most SDRs etc . I am looking ideally for a module that would take standard LS level from the rig , process the audio with setup options and output as a speaker level at around 2W .
I have found off the shelf boards , at a price , but was hoping for some reduction in my pension contribution .... This is for USB audio use on the G4RFR 10GHz EME system , where it would help to more closely define and de-noise incoming SSB .
73 John G0API
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Robin Szemeti - G1YFG
I'm pretty sure my 817 has a DSP board in it that resembles one of those BHI units, I never did quite work out what it was or how to activate/deactivate it ...this might inspre me to look at it again! On Mon, 30 Jan 2023 at 17:21, ian hope (2E0IJH) <ian@...> wrote:
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Robin Szemeti - G1YFG |
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Gary M1EGI
Hi all, Sota beams have various options which may be of interest to you... I've been considering one for my 817 73 Gary M1EGI |
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John Fell
Thank You Gary - interesting kit . 73 John G0API On Mon, 30 Jan 2023 at 22:08, Gary M1EGI <gary.m1egi@...> wrote:
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Dave_G0WBX
Hi.
There was nitPIC that uses a DSPIC dev kit... https://www.linkedin.com/pulse/what-happens-when-my-sleepless-nights-meets-dsp-guru-brief-malaspina The code was open source too. I have a copy on an old Win7 machine I keep for specific needs... Thinking that might be viable to graft into an older Rig if needed (probably inside a tin box with RFI filtered I/O!) I'll have to dig it out and have another play, when I'm back home. 73. Dave G8KBV PS: There is also a "nitpic" Linux tool, that emulates a Microchip PIC device. https://code.tools/man/1/nitpic/ *Very* limited capabilities at present it seems. -- Created on and sent from a Unix like PC running and using free and open source software: |
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Robin Szemeti - G1YFG
It turns out the one in my 817 is the Sotabeams automatic SSB/CW audio filter ... I can't say how well/unwell it works as it appears to be permanently in circuit. It's not unpleasant by anymeans if that helps. On Tue, 31 Jan 2023 at 10:47, John Fell <john.g0api@...> wrote:
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Robin Szemeti - G1YFG |
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Colin Ranson
Thanks for link,
This https://www.sotabeams.co.uk/audio-filters-and-more/ looks good for noise reduction (especially in my IC-375/275) if I had a clue how to use it ! – getting thicker as I get older.
Colin de G8LBS
Sent from Mail for Windows
From: Robin Szemeti - G1YFG via groups.io
Sent: 31 January 2023 13:26 To: UKMicrowaves@groups.io Subject: Re: [UKMicrowaves] DSP audio processing
It turns out the one in my 817 is the Sotabeams automatic SSB/CW audio filter ... I can't say how well/unwell it works as it appears to be permanently in circuit. It's not unpleasant by anymeans if that helps.
On Tue, 31 Jan 2023 at 10:47, John Fell <john.g0api@...> wrote:
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Thank you Gary,
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I have ordered one of the units you recommended . The noise from the audio section on the 817 is bad but didn’t really want to do the internal mod. Will let you know what I think. It’s the digging out of weak beacons that is problematic sometimes. 73 Dave G4GLT. On 31 Jan 2023, at 13:46, Colin Ranson <g8lbs@...> wrote:
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