Date   
Re: Community Installer Failure

Edward MacDonald
 

Try removing the external plugins from your plugins.xml file. If SDR# loads after that perhaps it is a plugin problem. Try re-adding the plugins one by one until you recieve the error again.





On Sat, Nov 16, 2019, 3:44 PM Pete Ferrand, <petef@...> wrote:

Thanks. As I wrote I installed the .NET prior to running the Community Installer.

Pete

-----Original Message-----
From: Rodrigo Pérez
Sent: Nov 16, 2019 9:07 AM
To: airspy@groups.io
Subject: Re: [airspy] Community Installer Failure

Tested with a clean install of windows 7 32bits, and works fine. No problems here.

SDR# 1732 requires .NET framework 4.8, you can download from here https://dotnet.microsoft.com/download/dotnet-framework/net48

Regards

Norton and M0AYF Loop Amp

Everett N4CY
 


Central Labs, the last manufacture of the 2N5109 transistor, has discontinued manufacturing it. So I have redesigned my Norton Preamplifier boards to take the SMD BFQ18 transistors.

 

I just finished building 3 of them and much to my surprise the 3 amplifiers have a 3dB 50kHz to 50MHz bandwidth. Also, based on IMD test that were run by Steve Ratzlaff  there was a 10dB increase in the OPI2, the OIP3 stayed about the same (Over the ones with the 2N5109 Transistors).

 

Here are the results. 1Mc +95.1 dBm OIP2, 7Mc +93.7 dBm OIP2, 2Mc +43.25 dBm, 3 5Mc +43.2 dBm OIP3

 

I also converted the Modified M0AYF loop amplifier boards over to the BFQ18 and have 3 of them built that are for sale and I still have 3 of them with the 2N5109 for sale. I will not build anymore with the 2N5109 transistors.

 

If anyone is interested in any of the above built and tested boards please contact me off list at everettsharp@...  everettshatp (at) com aol

 

Everett N4CY

Re: Common Mode Chokes

jdow
 

His use of "current mode", "voltage mode", and "balun" grate on me, the former two more than the third. The concept of "common mode choke" far more accurately describes the situation. It also explains why chokes at both ends outperform one choke especially if the common mode impedance to ground is "low" between the two chokes. The other type of balun is best used for instances requiring an impedance transformation since it is basically an auto-transformer or a transformer with isolated windings depending on how it is done. They have two different optimum uses which explains the 4:1 auto-transformer configuration's success with folded dipoles, loaded or not. Keeping in mind what you are asking the tool to do can improve your success as it allows you to choose the best tool.

{^_-}

On 20191116 05:47:02, Dionisis “Dennis” Drakopoulos wrote:
Colleagues, I suggest to also read an old article from W7EL. Quite informative.
*"BALUNS: What they do and how they do it."*
*http://www.dj0ip.de/app/download/5795872615/Baluns+What+They+Do+And+How+They+Do+It+by+W7EL-highlighted.pdf*
73 de SV1CDN, Dennis!

Re: Community Installer Failure

Pete Ferrand
 


Thanks. As I wrote I installed the .NET prior to running the Community Installer.

Pete

-----Original Message-----
From: Rodrigo Pérez
Sent: Nov 16, 2019 9:07 AM
To: airspy@groups.io
Subject: Re: [airspy] Community Installer Failure

Tested with a clean install of windows 7 32bits, and works fine. No problems here.

SDR# 1732 requires .NET framework 4.8, you can download from here https://dotnet.microsoft.com/download/dotnet-framework/net48

Regards

Re: Community Installer Failure

Rodrigo Pérez
 

Tested with a clean install of windows 7 32bits, and works fine. No problems here.

SDR# 1732 requires .NET framework 4.8, you can download from here https://dotnet.microsoft.com/download/dotnet-framework/net48

Regards

Re: Common Mode Chokes

Dionisis “Dennis” Drakopoulos
 


Colleagues, I suggest to also read an old article from W7EL. Quite informative.

Re: Common Mode Chokes

Chris Rogers
 

Hi Everett,
Is it possible to see a photo of your finished construction of your common mode choke so I can get some idea of construction please?

Re: Common Mode Chokes

Siegfried Jackstien
 

and depending on wire size and insulation thickness ... you can finetune the impedance of the two wires with the twist per inch ratio (a tiny bit)

a friend from me finetuned the impedance of the output transformer in his shortwave amp that way (with selecting the right wire size and insulation and tuning with twisting the wires) ... yes he made several tests till he found that "sweet spot" he searched for :-)

dg9bfc sigi

Am 15.11.2019 um 18:01 schrieb jdow:

A modest twist would likely be best - a couple twists per inch or so. That greatly extends the working bandwidth of the transformer.
{^_^}

On 20191114 13:00:00, Kenneth Sejkora via Groups.Io wrote:
Hi Everett,

Please ignore my earlier followup question.  I looked back at your previous email and saw that you used a cascade/series configuration in your choke design.  Did you take any efforts to magnetically isolate the two toroids from each other, or does that even matter?

You also mentioned the use of a 1:1 isolation transformer using a bifilar winding through a BN73-202 binocular ferrite.  Would you recommend twisting the two wires together prior to winding, or is there any advantage/disadvantage to winding each turn separately?

Thanks for indulging my questions.

Ken, WBØOCV


On Thursday, November 14, 2019, 09:52:21 AM EST, Ken Sejkora <quickhatch44@...> wrote:


Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro



Re: Common Mode Chokes

jdow
 

A modest twist would likely be best - a couple twists per inch or so. That greatly extends the working bandwidth of the transformer.
{^_^}

On 20191114 13:00:00, Kenneth Sejkora via Groups.Io wrote:
Hi Everett,
Please ignore my earlier followup question.  I looked back at your previous email and saw that you used a cascade/series configuration in your choke design.  Did you take any efforts to magnetically isolate the two toroids from each other, or does that even matter?
You also mentioned the use of a 1:1 isolation transformer using a bifilar winding through a BN73-202 binocular ferrite.  Would you recommend twisting the two wires together prior to winding, or is there any advantage/disadvantage to winding each turn separately?
Thanks for indulging my questions.
Ken, WBØOCV
On Thursday, November 14, 2019, 09:52:21 AM EST, Ken Sejkora <quickhatch44@...> wrote:
Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?
Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.
Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro

Re: Common Mode Chokes

Patrick
 

Everett,

Thanks for the chart.

Are the material 75 clamp-on ferrite actually totally useless at LF ? I was hoping they could have a minimal impact.

Le ven. 15 nov. 2019 à 17:51, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Patrick,

If the FT240-31 is all you have, then that i what you will have to use. For the area of coverage you want it is the worst of the bunch. All you can wind of the RG316 on a FT240 core is 35 turns. Below is the chart with the 3 toroid types, each with 35 turns. So you can see what the 31 mix will do compared to the other mix types.

Everett N4CY


In a message dated 11/15/2019 10:30:11 AM Central Standard Time, aunumero73@... writes:

Hi Everett,

Unfortunately, I have no TDK N30 on hand.
Only a FT240-31 ring and a couple of material 75 ferrite clamp on.

Le ven. 15 nov. 2019 à 17:08, Everett N4CY via Groups.Io <everettsharp@...> a écrit :
Patrick,

If you only want to use just one toroid, than use the TDK N30 with 35 turns on RG316 will cover the frequency area of interest.

Everett N4CY

On Nov 15, 2019, at 8:02 AM, Patrick <aunumero73@...> wrote:

Hi there,

<< You will wind each toroid with 35 turns and they are connected in series, not stacked >>
With 35 turns, what is the "frequency coverage" ?
How many turns would be required for this setup to be effective in the range 500-1200 kHz ?

Thanks

Le ven. 15 nov. 2019 à 12:14, Everett N4CY via Groups.Io <everettsharp@...> a écrit :
Ken

You will wind each toroid with 35 turns and they are connected in series, not stacked.

Everett

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44@... writes:

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro


On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp@...> wrote:


Hi Ken,

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

Your best bet for the RG316 coax is eBay...

Everett


 


 


Re: Common Mode Chokes

Everett N4CY
 

Patrick,

If the FT240-31 is all you have, then that i what you will have to use. For the area of coverage you want it is the worst of the bunch. All you can wind of the RG316 on a FT240 core is 35 turns. Below is the chart with the 3 toroid types, each with 35 turns. So you can see what the 31 mix will do compared to the other mix types.

Everett N4CY


In a message dated 11/15/2019 10:30:11 AM Central Standard Time, aunumero73@... writes:

Hi Everett,

Unfortunately, I have no TDK N30 on hand.
Only a FT240-31 ring and a couple of material 75 ferrite clamp on.

Le ven. 15 nov. 2019 à 17:08, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Patrick,

If you only want to use just one toroid, than use the TDK N30 with 35 turns on RG316 will cover the frequency area of interest.

Everett N4CY

On Nov 15, 2019, at 8:02 AM, Patrick <aunumero73@...> wrote:

Hi there,

<< You will wind each toroid with 35 turns and they are connected in series, not stacked >>
With 35 turns, what is the "frequency coverage" ?
How many turns would be required for this setup to be effective in the range 500-1200 kHz ?

Thanks

Le ven. 15 nov. 2019 à 12:14, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Ken

You will wind each toroid with 35 turns and they are connected in series, not stacked.

Everett

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44=yahoo.com@groups.io writes:

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro


On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> wrote:


Hi Ken,

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

Your best bet for the RG316 coax is eBay...

Everett


 


 


Re: Common Mode Chokes

Everett N4CY
 

Hi Ton,

You should use both together, one set at antenna and one set inside at receiver. It is okay to use the Cat5 wire with the BN73-202 binocular Core.

Everett

In a message dated 11/15/2019 10:29:57 AM Central Standard Time, tom@... writes:

Hi Everett,

You seem to be advocating the use of both the N30 and the FT240. Should one be used inside and the other outside? If so, which is which? I can’t mount one outside so could I connect the two in series just before the receiver?

 

With regard to the BN73-200, I have a query regarding the type of wire to use. Would a twisted pair removed from a CAT5 cable be suitable? I have loads!

 

Here in the UK, we never thank our service members for time in the military the way Americans do. I’ll put that right today by thanking all members of the UK’s armed services especially my son now 20 years in the RAF and my No1 project helper!

 

Everett, I hope this finds you in continued good health

 

Tom G6PZZ

 

From: airspy@groups.io <airspy@groups.io> On Behalf Of Everett N4CY via Groups.Io
Sent: 14 November 2019 17:51
To: airspy@groups.io
Subject: Re: [airspy] Common Mode Chokes

 

Ken


You will wind each toroid with 35 turns and they are connected in series, not stacked.


Everett


In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44@... writes:


Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?


Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.


Ken, WBØOCV East Falmouth, MA USA

41.5997N, 70.5614W  FN41ro



On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp@...> wrote:



Hi Ken,


You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.


You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.


Your best bet for the RG316 coax is eBay...


Everett



Re: Common Mode Chokes

Patrick
 

Hi Everett,

Unfortunately, I have no TDK N30 on hand.
Only a FT240-31 ring and a couple of material 75 ferrite clamp on.


Le ven. 15 nov. 2019 à 17:08, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Patrick,

If you only want to use just one toroid, than use the TDK N30 with 35 turns on RG316 will cover the frequency area of interest. 

Everett N4CY

On Nov 15, 2019, at 8:02 AM, Patrick <aunumero73@...> wrote:


Hi there,

<< You will wind each toroid with 35 turns and they are connected in series, not stacked >>
With 35 turns, what is the "frequency coverage" ?
How many turns would be required for this setup to be effective in the range 500-1200 kHz ?

Thanks

Le ven. 15 nov. 2019 à 12:14, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Ken

You will wind each toroid with 35 turns and they are connected in series, not stacked.

Everett

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44=yahoo.com@groups.io writes:

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro


On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> wrote:


Hi Ken,

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

Your best bet for the RG316 coax is eBay...

Everett

Re: Common Mode Chokes

Tom Crosbie G6PZZ <tom@...>
 

Hi Everett,

You seem to be advocating the use of both the N30 and the FT240. Should one be used inside and the other outside? If so, which is which? I can’t mount one outside so could I connect the two in series just before the receiver?

 

With regard to the BN73-200, I have a query regarding the type of wire to use. Would a twisted pair removed from a CAT5 cable be suitable? I have loads!

 

Here in the UK, we never thank our service members for time in the military the way Americans do. I’ll put that right today by thanking all members of the UK’s armed services especially my son now 20 years in the RAF and my No1 project helper!

 

Everett, I hope this finds you in continued good health

 

Tom G6PZZ

 

From: airspy@groups.io <airspy@groups.io> On Behalf Of Everett N4CY via Groups.Io
Sent: 14 November 2019 17:51
To: airspy@groups.io
Subject: Re: [airspy] Common Mode Chokes

 

Ken

 

You will wind each toroid with 35 turns and they are connected in series, not stacked.

 

Everett

 

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44@... writes:

 

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

 

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

 

Ken, WBØOCV East Falmouth, MA USA

41.5997N, 70.5614W  FN41ro

 

 

On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp@...> wrote:

 

 

Hi Ken,

 

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

 

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

 

Your best bet for the RG316 coax is eBay...

 

Everett

 

Re: Common Mode Chokes

Everett N4CY
 

Patrick,

If you only want to use just one toroid, than use the TDK N30 with 35 turns on RG316 will cover the frequency area of interest. 

Everett N4CY

On Nov 15, 2019, at 8:02 AM, Patrick <aunumero73@...> wrote:


Hi there,

<< You will wind each toroid with 35 turns and they are connected in series, not stacked >>
With 35 turns, what is the "frequency coverage" ?
How many turns would be required for this setup to be effective in the range 500-1200 kHz ?

Thanks

Le ven. 15 nov. 2019 à 12:14, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Ken

You will wind each toroid with 35 turns and they are connected in series, not stacked.

Everett

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44=yahoo.com@groups.io writes:

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro


On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> wrote:


Hi Ken,

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

Your best bet for the RG316 coax is eBay...

Everett

Re: Common Mode Chokes

Patrick
 

Hi there,

<< You will wind each toroid with 35 turns and they are connected in series, not stacked >>
With 35 turns, what is the "frequency coverage" ?
How many turns would be required for this setup to be effective in the range 500-1200 kHz ?

Thanks

Le ven. 15 nov. 2019 à 12:14, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> a écrit :
Ken

You will wind each toroid with 35 turns and they are connected in series, not stacked.

Everett

In a message dated 11/14/2019 10:54:48 AM Central Standard Time, quickhatch44=yahoo.com@groups.io writes:

Thanks Everett.  Fantastic information.  However, I'm having trouble envisioning the configuration using two toroids in each individual common mode choke.  Are the TDK N30 and FT240-31 toroids 'stacked' together, with the RG-316 looped through the 'stack' to tie them together?  Do you have a simplified drawing or photo of the configuration you use?

Thanks again.  Also, a belated Veterans Day thank you for your military service in the Air Force.

Ken, WBØOCV East Falmouth, MA USA
41.5997N, 70.5614W  FN41ro


On Thursday, November 14, 2019, 08:55:20 AM EST, Everett N4CY via Groups.Io <everettsharp=aol.com@groups.io> wrote:


Hi Ken,

You need only one of the TDK N30 and one FT240-31 cores, each must be wound with 35 turns of RG316. Also as Paul said you will need one at the antenna and one at the receiver. Also another thing that will help is a isolation transformer between the coax and your receiver, which can be made using a BN73-202 binocular core with 6 bifilar turns. One winding will go to your coax and the other to your receiver.

You can get all of the ferrite from Mouser Electronics. You have the part number for the TDK core and the part number for the FT240-31 is 2631803802, the part number for the BN73-202 is 2873000202.. So you will need 2 of the FT240-31 and 2 of the TDK30 and you might want to get several of the BN73-200 cores as they are great for making up matching transformers.

Your best bet for the RG316 coax is eBay...

Everett

Re: measuring common mode chokes

doug
 

On 11/13/2019 08:31 PM, Tom Crosbie G6PZZ wrote:
I have just completed one of Everett’s chokes and I just need to put
connectors on a second. I can only fit them inside presently and will be
doing that this weekend. It’s just going to have to do. I’ve managed to
reduce some interference buy fitting a couple of clamp-on ferrites of
Chinese origin to every mains appliance in my room. I didn’t understand
enough about ferrites until hooking up with Everett and others so
perhaps in time when funds permit I’ll upgrade them.

I did buy some common mode chokes built around an IEC socket but those
are yet to be deployed. It’s a massive job hunting down sources of
EMI/RFI so if anyone has a guide to doing that, please let me know!

Tom G6PZZ
/snip/

One way to do it is to shut off everything in your house except the
receiver. More easily said than done, but it's an excellent start. If
the noise is still there, it's coming from outside, and you have a
different problem.

(In that case, a portable radio that can hear on the frequencies the
noise is, and a walk around the neighborhood is your next look for it.)

If the noise is gone when your other stuff--including lighting fixtures,
automatic timers for lights, etc is--then turn things on one at a time
until you locate a problem, then get out the ferrites and fix that. Then
start to turn other things on, and so on.

If the noise is outside your house, then look for local spots like
electric light poles, as well as houses and other buildings. If you find
a suspicious light pole, a call to the utility is your next shot. The
utility prefers that you don't bang on a suspicious pole with a small
sledge hammer, wink, wink.

If the noise seems to be coming from a house, you should get the local
radio club involved. They may have someone with experience talking to
the owner of the premises.

--doug, WA2SAY

SDR# requests ?

Marcus Ramos
 

Hi ...

I did not found any wish list topic so there is 2 comments:

1 - change the display range/offset adjustments from 10dB each step to 5db. Reason: on HF 5dB steps may be useless but on VLF can help to expand the signals within the avialable spectrum analyzer vertical scale, when this scale is reduced to 20 or 30dB range. Recently I was learning how to use the baseband noise blanker on VLF to kill atmospheric crashes, increased display resolution and decreased spectrum smoothing attack/decay speed and this combination allowed me to better observe those usual VLF signals w/ more accuracy. But baseline or was around 20/25% of the spectrum Y axis or was below the bottom line. 5dB steps can "fine tune" this.

2 - IF noise reduction (custom profile): allow saving a couple of custom NR setup (e.g custom 1, custom 2, etc).

Regards / 73
Marcus
PY2PLL + PY3CRX

Community Installer Failure

Pete Ferrand
 

Tried the community installer for the first time today after installing #1732 and the new .NET framework. 1732 runs fine when installed in its own directory as previous versions.

However, community installer creates an sdrsharp directory on the c: drive. When this sdrsharp is run, the Airspy logo appears for a few moments, then some disk activity, then nothing at all. No warnings, no indication anything is wrong, but the program does not appear. 

System is Windows 7 32 bit. Tried running in Administrator, didn't help. Any other ideas?

Thanks!
Pete
WB2QLL

Re: The sleeping device issue - found some odd behaviour #spyserver

commercial@...
 

All my AS Rxs work normally when driven from SDR# directly.
To reiterate:
Using Spyserver I can only connect successfully when from running SS from a USB pen drive.
Using SS from e.g. a folder on the desktop it will give me a server busy pop up, CMD window: device was sleeping. Wake up! Could not acquire the device.

Thanks for the tip with the USB power, I have set all my USB to no-power save but it has made of course no difference. The issue still persists.

Mike