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Re: Apparent problem with GPSD support in Direwolf 1.6

 

See below.

System works fine with gpsd running and puck connected.? In direwolf.conf GPSD disabled.

System works fine with gpsd running and no puck connected.? In direwolf.conf GPSD disabled.

System works fine with gpsd not running and no puck connected.?? In direwolf.conf GPSD disabled.

System fails with puck connected, gpsd running and GPSD enabled in direwolf.conf.

On Mon, Sep 13, 2021 at 11:41 AM David Ranch <direwolf-groupsio@...> wrote:

Btw... as an experiment, try the following:

?? 1. Have your receiving radio on 144.390
check?

?? 2. disable gpsd
check?

?? 3. disconnect your GPS
check?

?? 4. open up the receive squelch and turn up the volume so you can hear the FM static
check?

?? 5. connect the GPS.? Did you hear any difference in the FM static?? You might not as you really need to be listening when there is is some other active transmitter on frequency.?

?? 6. enable gpsd.? Did you hear any difference in the FM static?? Did you hear any difference in the FM static?? You might not as you really need to be listening when there is is some other active transmitter on frequency.? Maybe try QSYing the radio to an active analog FM repeater with an ongoing conversation that's near 144.390.
no change in statuic?


Btw, I had a very similar "receive sensitivity" issue on an APRS setup when using an Ambicom USB GPS:

??

I had to stop using that GPS due to the various interference it would create on 144.390.

--David
KI6ZHD





On 09/13/2021 08:25 AM, David Ranch wrote:

Hello Don,

If GPSD is not enabled and I use PBEACON and digipeating Direwolf is functioning, packets are received?by a wide variety of stations.? A capture of the sound is below as nogpsd.m4a.

This sounds ok though I'm guessing your using a Kenwood radio right?? Why am I hearing a beep before the AFSK-1200bps packet and then another beep after the packet.? That should NOT be happening.



If GPSD is enabled, and I use PBEACON?and digipeating, Direwolf packets are in general not?decoded by any system. ?(sometimes one gets lucky but success is at best intermittent).? A capture of the sound is attached as gpsd.m4a.

To me, it sounds like you're missing the begining of the packet here.? Have you 100% opened the squelch on your radio?? This is how Direwolf is intended to run.?? If this turns out to be your issue, maybe starting up gpsd and thus powering up your GPS is creating some interference on the VHF receiver and it's hurting your current squelch setting.? Again.. open it up 100%.?? Also.. the Kenwood beeps are there which should NOT be there.


- Rasperry PI 3
- Raspian?with Pulse?audio removed per Raspberry instructions
- Direwolf 1.6

Please note that the recommendation to remove PulseAudio is no longer required as this only applied to older versions of Raspberry Pi OS.? There is an open Github issue on this:

???

Your existing setup should work perfectly fine with it removed but of you're using Xwindows on this Raspberry Pi and want to use say system sounds via a different soundcard, things probably won't work.


--David
KI6ZHD



--

73,
AB1PH
Don Rolph
Re: RFI issues with RPi3B+

 

Have the hats coming now, which I’m sure will wire fine. I’ll probably use the one that is similar to the Fe-Pi and around with the Audio injector for something else.

Also, found this USB audio adapter in one of my junk drawers that I totally forgot about. If picture can’t be posted here, it’s one of those USB audio adapters that has about a 4” USB cable, then has a volume dial on the adapter itself, plus buttons turn on/off the speaker or microphon independent. It’s working and is kind of cool because it’s another point to adjust volume (found it works well to use dongle knob to make fine adjustments), plus the button switches are pretty cool if you, say, want to turn off the digipeter but still have iGate running (or vice-versa). Found my RFI issue really wasn’t much of an issue anyway now that I’m connected to an outdoor antenna (Diamond V2000A). Very cool. I’d say with the dongles, it’s seems about 99% solidrbut expect with a hat it to be 100^. :-)



Sent from my iPhone 11 Max Pro

image0.jpeg

Re: OK I seem to be homing in on the problem

 

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Hello John,

RFI is a possiblity, though I would think the GPS electronics are active whenever it is attached to the USB port.?

That depends on the GPS and how gpsd is started:

man gpsd:
--
?????? -n
?????????? Don?t wait for a client to connect before polling whatever GPS is associated with it. Some RS232 GPSes wait in a standby mode (drawing less power) when the
?????????? host machine is not asserting DTR, and some cellphone and handheld embedded GPSes have similar behaviors. Accordingly, waiting for a watch request to open
?????????? the device may save battery power. (This capability is rare in consumer-grade devices and nonexistent in USB GPSes which lack a DTR line.)
--



I've found with at least the GlobalSat BU-353-S4 USB GPS unit on a Raspberry Pi, it won't fully activate and start determining it's location until a gps client (cgps, xgps, direwolf, etc.) connects to the gpsd daemon.

--David
KI6ZHD
Re: Apparent problem with GPSD support in Direwolf 1.6

 

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Btw... as an experiment, try the following:

?? 1. Have your receiving radio on 144.390

?? 2. disable gpsd

?? 3. disconnect your GPS

?? 4. open up the receive squelch and turn up the volume so you can hear the FM static

?? 5. connect the GPS.? Did you hear any difference in the FM static?? You might not as you really need to be listening when there is is some other active transmitter on frequency.?

?? 6. enable gpsd.? Did you hear any difference in the FM static?? Did you hear any difference in the FM static?? You might not as you really need to be listening when there is is some other active transmitter on frequency.? Maybe try QSYing the radio to an active analog FM repeater with an ongoing conversation that's near 144.390.


Btw, I had a very similar "receive sensitivity" issue on an APRS setup when using an Ambicom USB GPS:

??

I had to stop using that GPS due to the various interference it would create on 144.390.

--David
KI6ZHD





On 09/13/2021 08:25 AM, David Ranch wrote:


Hello Don,

If GPSD is not enabled and I use PBEACON and digipeating Direwolf is functioning, packets are received?by a wide variety of stations.? A capture of the sound is below as nogpsd.m4a.

This sounds ok though I'm guessing your using a Kenwood radio right?? Why am I hearing a beep before the AFSK-1200bps packet and then another beep after the packet.? That should NOT be happening.



If GPSD is enabled, and I use PBEACON?and digipeating, Direwolf packets are in general not?decoded by any system. ?(sometimes one gets lucky but success is at best intermittent).? A capture of the sound is attached as gpsd.m4a.

To me, it sounds like you're missing the begining of the packet here.? Have you 100% opened the squelch on your radio?? This is how Direwolf is intended to run.?? If this turns out to be your issue, maybe starting up gpsd and thus powering up your GPS is creating some interference on the VHF receiver and it's hurting your current squelch setting.? Again.. open it up 100%.?? Also.. the Kenwood beeps are there which should NOT be there.


- Rasperry PI 3
- Raspian?with Pulse?audio removed per Raspberry instructions
- Direwolf 1.6

Please note that the recommendation to remove PulseAudio is no longer required as this only applied to older versions of Raspberry Pi OS.? There is an open Github issue on this:

???

Your existing setup should work perfectly fine with it removed but of you're using Xwindows on this Raspberry Pi and want to use say system sounds via a different soundcard, things probably won't work.


--David
KI6ZHD
Re: OK I seem to be homing in on the problem

 




On Mon, Sep 13, 2021 at 11:12 AM David Ranch <direwolf-groupsio@...> wrote:

If I was to guess, once you enable gpsd and it powers up the GPS and then your radio starts transmitting, you're getting RFI coming back into the system that's impacting your sound card's output.? This isn't an uncommon issue.? How close are all the wires and cables to the transmitting antenna?? Can you move the transmitting antenna and ideally transmitting radio as FAR AWAY from the rest of the Raspberry Pi, GPS, and all cabling as possible?? Can you add ferrites to both sides of all your power, audio, etc cables?


--David
KI6ZHD




RFI is a possiblity, though I would think the GPS electronics are active whenever it is attached to the USB port.? We have not seen issues with GPS (other than the version of GPSD) as a tracker with Direwolf.? I tend to use the DRAWS? HAT and active antenna.


--
John D. Hays
Kingston, WA
K7VE / WRJT-215

?
Re: Apparent problem with GPSD support in Direwolf 1.6

 

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Hello Don,

If GPSD is not enabled and I use PBEACON and digipeating Direwolf is functioning, packets are received?by a wide variety of stations.? A capture of the sound is below as nogpsd.m4a.

This sounds ok though I'm guessing your using a Kenwood radio right?? Why am I hearing a beep before the AFSK-1200bps packet and then another beep after the packet.? That should NOT be happening.



If GPSD is enabled, and I use PBEACON?and digipeating, Direwolf packets are in general not?decoded by any system. ?(sometimes one gets lucky but success is at best intermittent).? A capture of the sound is attached as gpsd.m4a.

To me, it sounds like you're missing the begining of the packet here.? Have you 100% opened the squelch on your radio?? This is how Direwolf is intended to run.?? If this turns out to be your issue, maybe starting up gpsd and thus powering up your GPS is creating some interference on the VHF receiver and it's hurting your current squelch setting.? Again.. open it up 100%.?? Also.. the Kenwood beeps are there which should NOT be there.


- Rasperry PI 3
- Raspian?with Pulse?audio removed per Raspberry instructions
- Direwolf 1.6

Please note that the recommendation to remove PulseAudio is no longer required as this only applied to older versions of Raspberry Pi OS.? There is an open Github issue on this:

???

Your existing setup should work perfectly fine with it removed but of you're using Xwindows on this Raspberry Pi and want to use say system sounds via a different soundcard, things probably won't work.


--David
KI6ZHD
Re: OK I seem to be homing in on the problem

 

I. have posted some examples of the sounds in a second post.

I understand that PBEACON?is not controlled by GPSD support but PBEACON and more importantly for my testing digipeating are functional if GPSD is enabled.

The behavior is as follows:

- GPSD disable: ?Direwolf functions normally and packets are decoded by nearly all stations which receive the packets

- I enable GPSD and nothing else?and the PBEACON?packets and digipeated packets sound "rough" and the packet ?are not decoded

- I enable GPSD and enable TBEACON and digipeating and the packets sound rough?and are not decoded

When GPSD is enabled it measurably degrades?the sound when listened to and the packets can not be decoded.

It is not a function?of sound level: ?adjusting levels changes volume but not behavior.

It is not a function of the sound card: ?this problem is evidenced with a DINAH usb sound?card and a Signalink usb sound card.

At this point it would?appear that there is a problem with the GPSD capabilities in Direwolf.

Direwolf works fine for a static digipeater but is not working as a tracker with location provided by gpsd daemon.



On Mon, Sep 13, 2021 at 11:12 AM David Ranch <direwolf-groupsio@...> wrote:

Hello Don,


My direwolf system performs perfectly with GPSD disabled in the direwolf.conf.
I have PBEACON?on and have set up a system to listen to the sound.

The PBEACON function is for static locations only and doesn't have any interaction with GPSD.? It's on the TBEACON (Tracker BEACON) that uses your GPS.


I hear the usual rough but steady sound.

I don't know quite what you mean by "rough" but your 1200bps AFSK packet sounds should sound similar to these examples with a clear, not distorted sound:

??



I now enable the GPSD option.
PBEACON?is still on.

Again, these should be 100% unrelated.


I listen to the sound, it is extremely rough and erratic and my systems are unable to decode the packet.

You're listening to what you're system is transmitting or what it's receiving?? Can you provide a mp3/wav file example of this?



It appears that enabling GPSD seriously?degrades the quality?of the modulating sound produced?by direwolf making the sound unreadable most of the time.
I have increased and decreased the volume of the sound and it has no impact, so. it appears to be an issue in the generation of the tones themselves not in the levels.

If I was to guess, once you enable gpsd and it powers up the GPS and then your radio starts transmitting, you're getting RFI coming back into the system that's impacting your sound card's output.? This isn't an uncommon issue.? How close are all the wires and cables to the transmitting antenna?? Can you move the transmitting antenna and ideally transmitting radio as FAR AWAY from the rest of the Raspberry Pi, GPS, and all cabling as possible?? Can you add ferrites to both sides of all your power, audio, etc cables?


--David
KI6ZHD



--

73,
AB1PH
Don Rolph
Re: OK I seem to be homing in on the problem

 

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Hello Don,


My direwolf system performs perfectly with GPSD disabled in the direwolf.conf.
I have PBEACON?on and have set up a system to listen to the sound.

The PBEACON function is for static locations only and doesn't have any interaction with GPSD.? It's on the TBEACON (Tracker BEACON) that uses your GPS.


I hear the usual rough but steady sound.

I don't know quite what you mean by "rough" but your 1200bps AFSK packet sounds should sound similar to these examples with a clear, not distorted sound:

??



I now enable the GPSD option.
PBEACON?is still on.

Again, these should be 100% unrelated.


I listen to the sound, it is extremely rough and erratic and my systems are unable to decode the packet.

You're listening to what you're system is transmitting or what it's receiving?? Can you provide a mp3/wav file example of this?



It appears that enabling GPSD seriously?degrades the quality?of the modulating sound produced?by direwolf making the sound unreadable most of the time.
I have increased and decreased the volume of the sound and it has no impact, so. it appears to be an issue in the generation of the tones themselves not in the levels.

If I was to guess, once you enable gpsd and it powers up the GPS and then your radio starts transmitting, you're getting RFI coming back into the system that's impacting your sound card's output.? This isn't an uncommon issue.? How close are all the wires and cables to the transmitting antenna?? Can you move the transmitting antenna and ideally transmitting radio as FAR AWAY from the rest of the Raspberry Pi, GPS, and all cabling as possible?? Can you add ferrites to both sides of all your power, audio, etc cables?


--David
KI6ZHD
Apparent problem with GPSD support in Direwolf 1.6

 

There appears to?be a problem with GPSD support in Direwolf 1.6

If GPSD is not enabled and I use PBEACON and digipeating Direwolf is functioning, packets are received?by a wide variety of stations.? A capture of the sound is below as nogpsd.m4a.

If GPSD is enabled, and I use PBEACON?and digipeating, Direwolf packets are in general not?decoded by any system. ?(sometimes one gets lucky but success is at best intermittent).? A capture of the sound is attached as gpsd.m4a.

Configuration is:

- Rasperry PI 3
- Raspian?with Pulse?audio removed per Raspberry instructions
- Direwolf 1.6


This behavior occurs with both a DINAH usb sound adapter with JP3 cut and with a Signalink sound adapter, so it appears to be sound adapter independent.

Direwolf is quite usable as a static digipeater system.

At this point I have not been able to get Direwolf to be stable as a GPS tracker.

I am unsure what to do next, since it appears to be a function?of the Direwolf software.

What options do I have for assistance here?

Thanks in advance!






--

73,
AB1PH
Don Rolph

nogpsd.m4a
nogpsd.m4a
gpsd.m4a
gpsd.m4a

OK I seem to be homing in on the problem

 

My direwolf system performs perfectly with GPSD disabled in the direwolf.conf.

I have PBEACON?on and have set up a system to listen to the sound.

I hear the usual rough but steady sound.

I now enable the GPSD option.

PBEACON?is still on.

I listen to the sound, it is extremely rough and erratic and my systems are unable to decode the packet.

It appears that enabling GPSD seriously?degrades the quality?of the modulating sound produced?by direwolf making the sound unreadable most of the time.

I have increased and decreased the volume of the sound and it has no impact, so. it appears to be an issue in the generation of the tones themselves not in the levels.

Thoughts?

Thanks!

--

73,
AB1PH
Don Rolph
Re: RFI issues with RPi3B+

 

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Budd can probably speak more to this, but the supply chain stuff is a real issue in China, it's
hard to get anything through, and if you do, the prices are high.? Hopefully temporary.? both
of these cards cost more than a Pi Zero.

The Audio Injector is 24/96K afaik, which is great, but for some reason it has a -6dB cut in the
hardware on the input.?? If you're using an FTM100 or FTM400 tnc output for example, you'll
never get more than "30" volume level on direwolf.? I brought it up on this list a while back,
and while it's not a showstopper, it's certainly distracting from an otherwise great card.

cool,
-craig
KM6LYW

On 9/11/21 7:38 PM, J K via groups.io wrote:



On Saturday, September 11, 2021, 09:59:33 PM EDT, Craig, KM6LYW <craig@...> wrote:


?? Pi Audio Cards
??

?? Fe-Pi Audio Z v2? [x] 1 Fe-Pi Sound Card without kit WB7FHC? ($24)
??

?? Audio Injector Z? Amazon??? ($20)
??


The Fe-Pi is still the best imho.? Budd, WB7FHC got the gerber files from the
guy who used to have them produced.? All new maker, same great taste.

best,
-craig
KM6LYW

Craig.

That looks great. ?Why not, it’s just a messy $28. ?Even if don’t use it for this, I’m sure to use it for something else. ?Ordering. ?May get one of those audio injectors (for the RPi0) also though. ?

Thanks,
Jerry?
Re: RFI issues with RPi3B+

 

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On Saturday, September 11, 2021, 09:59:33 PM EDT, Craig, KM6LYW <craig@...> wrote:


?? Pi Audio Cards
??

?? Fe-Pi Audio Z v2? [x] 1 Fe-Pi Sound Card without kit WB7FHC? ($24)
??

?? Audio Injector Z? Amazon??? ($20)
??


The Fe-Pi is still the best imho.? Budd, WB7FHC got the gerber files from the
guy who used to have them produced.? All new maker, same great taste.

best,
-craig
KM6LYW

Craig.

That looks great. ?Why not, it’s just a messy $28. ?Even if don’t use it for this, I’m sure to use it for something else. ?Ordering. ?May get one of those audio injectors (for the RPi0) also though. ?

Thanks,
Jerry?
Re: RFI issues with RPi3B+

 

The BIG advantage to the listed Amazon version is the 96k sample rate.
Especially if you want to use it with an SDR with I/Q sampling.

Funny, I haven't seen the Fe-Pi for sale on the WB7FHC website.
Seems I did before.

Robert Giuliano
KB8RCO



On Saturday, September 11, 2021, 09:59:33 PM EDT, Craig, KM6LYW <craig@...> wrote:


?? Pi Audio Cards
??

?? Fe-Pi Audio Z v2? [x] 1 Fe-Pi Sound Card without kit WB7FHC? ($24)
??

?? Audio Injector Z? Amazon??? ($20)
??


The Fe-Pi is still the best imho.? Budd, WB7FHC got the gerber files from the
guy who used to have them produced.? All new maker, same great taste.

best,
-craig
KM6LYW


On 9/11/21 2:20 PM, J K via groups.io wrote:


On Sep 11, 2021, at 2:45 PM, David RanchX ?<direwolf-groupsio@...> wrote:

?

Hello Max,

Did you read in that section where the Nexus DR-X people have created a clone of the Fe-Pi for sale?

--David

Hi, ?

Looks like my eyes skipped over that, but have the DR-X main website bookmarked now. ?Looks pretty cool. ?May just build one once I’m done with current thing. ?(Putting together another AllStar node, using just a low power transceiver hat. ?My main AllStar node runs off an Alinco DR-235, but the “micro-node” will be for the car. I have an iPad LTE under backseat that provides a WiFi hotspot that it’ll use for connectivity that’s currently giving connectivity for a duplex N5BOC mmdvm.)

-Jerry?
?
Re: RFI issues with RPi3B+

 

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?? Pi Audio Cards
??

?? Fe-Pi Audio Z v2? [x] 1 Fe-Pi Sound Card without kit WB7FHC? ($24)
??

?? Audio Injector Z? Amazon??? ($20)
??


The Fe-Pi is still the best imho.? Budd, WB7FHC got the gerber files from the
guy who used to have them produced.? All new maker, same great taste.

best,
-craig
KM6LYW


On 9/11/21 2:20 PM, J K via groups.io wrote:



On Sep 11, 2021, at 2:45 PM, David RanchX ?<direwolf-groupsio@...> wrote:

?
Hello Max,

Did you read in that section where the Nexus DR-X people have created a clone of the Fe-Pi for sale?

--David

Hi, ?

Looks like my eyes skipped over that, but have the DR-X main website bookmarked now. ?Looks pretty cool. ?May just build one once I’m done with current thing. ?(Putting together another AllStar node, using just a low power transceiver hat. ?My main AllStar node runs off an Alinco DR-235, but the “micro-node” will be for the car. I have an iPad LTE under backseat that provides a WiFi hotspot that it’ll use for connectivity that’s currently giving connectivity for a duplex N5BOC mmdvm.)

-Jerry?
?
Re: RFI issues with RPi3B+

 

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On Sep 11, 2021, at 2:45 PM, David RanchX ?<direwolf-groupsio@...> wrote:

?
Hello Max,

Did you read in that section where the Nexus DR-X people have created a clone of the Fe-Pi for sale?

--David

Hi, ?

Looks like my eyes skipped over that, but have the DR-X main website bookmarked now. ?Looks pretty cool. ?May just build one once I’m done with current thing. ?(Putting together another AllStar node, using just a low power transceiver hat. ?My main AllStar node runs off an Alinco DR-235, but the “micro-node” will be for the car. I have an iPad LTE under backseat that provides a WiFi hotspot that it’ll use for connectivity that’s currently giving connectivity for a duplex N5BOC mmdvm.)

-Jerry?
?
Re: RFI issues with RPi3B+

 

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Hello Max,

Did you read in that section where the Nexus DR-X people have created a clone of the Fe-Pi for sale?

--David


On 09/11/2021 10:58 AM, J K via groups.io wrote:

Hello David,

Yeah, those Fe-Pi is the main one I’ve been trying to hunt and have set to be informed immediately I’d pops up on eBay, but it’s discontinued and remaining stock dried up. ?Might just settle on an the audio injector though, ?I’ve had that in watch list too. ?

11 Max Pro

On Sep 11, 2021, at 1:22 PM, David Ranch <direwolf-groupsio@...> wrote:

?
Hello Jerry,

Actually, if I come across s simple audio Pi hat (simple 3.5mm speaker and mic jacks only), I may go with that instead of using any USB ports for the sound, but they don’t seem like they are made much anymore. ?I seem to remember them being a dime a dozen, but the audio hate now are all more advanced (Dolby 7.1, etc) when just need something very basic.?

There are still options out there.? Here are some ideas for you:

??

--David
KI6ZHD
Re: RFI issues with RPi3B+

 

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There are still options out there.? Here are some ideas for you:

?

--David
KI6ZHD

Hello David,

Yeah, that Fe-Pi is the main one I’ve been trying to hunt and have eBay set to be informed immediately if it pops up, but it’s discontinued and remaining stock dried up. ?Might just settle on the audio injector though, ?I’ve had that in watch list too. ?

-Jerry
_
Re: RFI issues with RPi3B+

 

开云体育

Hello David,

Yeah, those Fe-Pi is the main one I’ve been trying to hunt and have set to be informed immediately I’d pops up on eBay, but it’s discontinued and remaining stock dried up. ?Might just settle on an the audio injector though, ?I’ve had that in watch list too. ?

11 Max Pro

On Sep 11, 2021, at 1:22 PM, David Ranch <direwolf-groupsio@...> wrote:

?
Hello Jerry,

Actually, if I come across s simple audio Pi hat (simple 3.5mm speaker and mic jacks only), I may go with that instead of using any USB ports for the sound, but they don’t seem like they are made much anymore. ?I seem to remember them being a dime a dozen, but the audio hate now are all more advanced (Dolby 7.1, etc) when just need something very basic.?

There are still options out there.? Here are some ideas for you:

??

--David
KI6ZHD
Re: RFI issues with RPi3B+

 

开云体育


Hello Jerry,

Actually, if I come across s simple audio Pi hat (simple 3.5mm speaker and mic jacks only), I may go with that instead of using any USB ports for the sound, but they don’t seem like they are made much anymore. ?I seem to remember them being a dime a dozen, but the audio hate now are all more advanced (Dolby 7.1, etc) when just need something very basic.?

There are still options out there.? Here are some ideas for you:

??

--David
KI6ZHD

Until then, I’ll take your advice and get a good, well shielded, USB cable from C2G or Tripplite.

Thanks again,
Jerry

11 Max Pro

On Sep 8, 2021, at 11:50 AM, Brian Blanchard via groups.io <brian.j.blanchard@...> wrote:

? I had issues with RFI on Raspberry Pi4 connected to an Icom IC705. I ended up taking a 10ft usb cable and wrapping it up (no ferrite, no torroid). The wraps choked out RFI and it works fine now.?

Brian Blanchard
(336) 682-1046
Work (480) 338-8760
KJ7RNY

On Sep 8, 2021, at 08:24, Jim Bacher - WB8VSU <wb8vsu@...> wrote:

?
Jerry, a lot of the low cost cables are not well made, as in poorly shielded. They should be avoid in ham applications.

I only use brands I can trust to be well made, such as Cables2Go (C2G), Tripplite, Dell or HP. I have used these brands previously when running FCC / European RF emissions tests and had no issues with them. Due to wear and tear I replaced them on a regular bases.

Other major companies such as Apple and Asus, etc also likely sell quality cables. I just have not used them during any of the testing I did, so I can't confirm they are ok.

Jim Bacher, WB8VSU
On Sep 8, 2021, at 9:07 AM, "J K via " <yahoo.com@groups.io target=_blank>[email protected]> wrote: 
I know why it was working before, but stopped afterwards.  I had added a 6” USB extension cable instead of plugging the USB sound card directly in/. Apparently, it was acting like an antenna.  Had thought about that right before, but thought the cable was well shielded.  Apparently not.  Maybe I’ll try ferrite chokes later, but it’s working directly plugged in:

11 Max Pro


 On Sep 7, 2021, at 8:48 PM, J K <kuhnje@...> wrote:
 
 ?Ok, it was an RFI issue.  Wow, I never knew the RPi was that sensitive.  Anyway, it’s working now.

Re: RFI issues with RPi3B+

 

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Re: Jim Bacher

Thanks! ?I will check out Cables2Go and Tripplite. ?It’s working beautify now by being directly plugged into a USB port, but I wouldn’t mind using a good USB extender since the dongle physically hogs up the space of the USB port right above/below it too. ?Actually, if I come across s simple audio Pi hat (simple 3.5mm speaker and mic jacks only), I may go with that instead of using any USB ports for the sound, but they don’t seem like they are made much anymore. ?I seem to remember them being a dime a dozen, but the audio hate now are all more advanced (Dolby 7.1, etc) when just need something very basic. ?Until then, I’ll take your advice and get a good, well shielded, USB cable from C2G or Tripplite.

Thanks again,
Jerry

11 Max Pro

On Sep 8, 2021, at 11:50 AM, Brian Blanchard via groups.io <brian.j.blanchard@...> wrote:

?I had issues with RFI on Raspberry Pi4 connected to an Icom IC705. I ended up taking a 10ft usb cable and wrapping it up (no ferrite, no torroid). The wraps choked out RFI and it works fine now.?

Brian Blanchard
(336) 682-1046
Work (480) 338-8760
Brian.j.blanchard@...
KJ7RNY

On Sep 8, 2021, at 08:24, Jim Bacher - WB8VSU <wb8vsu@...> wrote:

?
Jerry, a lot of the low cost cables are not well made, as in poorly shielded. They should be avoid in ham applications.

I only use brands I can trust to be well made, such as Cables2Go (C2G), Tripplite, Dell or HP. I have used these brands previously when running FCC / European RF emissions tests and had no issues with them. Due to wear and tear I replaced them on a regular bases.

Other major companies such as Apple and Asus, etc also likely sell quality cables. I just have not used them during any of the testing I did, so I can't confirm they are ok.

Jim Bacher, WB8VSU
wb8vsu@...
On Sep 8, 2021, at 9:07 AM, "J K via " <yahoo.com@groups.io target=_blank>[email protected]> wrote:
I know why it was working before, but stopped afterwards.  I had added a 6” USB extension cable instead of plugging the USB sound card directly in/. Apparently, it was acting like an antenna.  Had thought about that right before, but thought the cable was well shielded.  Apparently not.  Maybe I’ll try ferrite chokes later, but it’s working directly plugged in:

11 Max Pro

 On Sep 7, 2021, at 8:48 PM, J K <kuhnje@...> wrote:
 
 ?Ok, it was an RFI issue.  Wow, I never knew the RPi was that sensitive.  Anyway, it’s working now.
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