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Re: ACTIVE BROADAND ANTENNA How do I improve HF performance?

obrianboru@...
 

Thanks Chris. I'll fit 43 and 73 clip-ons as you advise, I assume that making more than one turn through the clip-ons to increase common mode choking at HF might add unwanted inductance and upset the VHF UHF response of the antenna, ...but I'll experiment !
73 Jeff 2E0CIT


Re: YouTube video of Loop Antenna Amplifier + in use

Chris Moulding
 

It sounds like it's working well for you, Mike!

For others on the forum what are the details of the loop you use with the amplifier?

Regards,

Chris


Re: YouTube video of Loop Antenna Amplifier + in use

Mike
 

This antenna is a BEAST. 


Re: ACTIVE BROADAND ANTENNA How do I improve HF performance?

Simon
 

Steve

May I suggest you remove your phone number asap..

This is an open group..

Simon


Re: ACTIVE BROADAND ANTENNA How do I improve HF performance?

Chris Moulding
 

We stopped manufacturing the Broadband Active Antenna at the start of the Covid-19 lockdown.

During the lockdown I took the opportunity to re-design the antenna so that it will work directly from a 5V bias-T such as that in the SDRPlay receivers.

The prototype works really well and we are about to make the first batch of the new design. The manufacturer of the GRP tube we use for the antenna has not re-started production yet so I've ordered tube from another supplier but so far the promised delivery is two days late!

I've not worked out the final price yet until the first batch is built and tested and I know what shipping materials are needed.

I've already got a waiting list for the new antenna so we expect to make a second batch soon after the first one.

I'll post on the website and on this forum once the antennas are ready for sale.

Regards,

Chris


Re: ACTIVE BROADAND ANTENNA How do I improve HF performance?

Chris Moulding
 

The later versions of the original Broadband Active Antenna had common mode chokes on the coax feed inside the antenna to stop RF noise from the coax cable reaching the amplifier in the antenna.

To get the same performance I would suggest using two clip-on chokes on the RG-58 feeder cable close to the antenna. I would fit a 43 grade ferrite closest to the antenna with a second ferrite of 73 grade ferrite next to it. Using two different grades of ferrite material improves the frequency range of the RFI suppression and is also very effective in other situations where ferrite is needed.

Regards,

Chris


Re: YouTube video of Loop Antenna Amplifier + in use

Chris Moulding
 

https://youtu.be/Xv_JtaoYD0A

This link should work.

Regards,

Chris


Re: YouTube video of Loop Antenna Amplifier + in use

Chris Moulding
 

https://youtu.be/Xv_JtaoYD0A

Here is the link to the YouTube video.

Regards,

Chris


YouTube video of Loop Antenna Amplifier + in use

Chris Moulding
 

Mike Ladd, KD2KOG who is tech support for SDRPlay has just posted a video showing his loop antenna using a Loop Antenna Amplifier + from his home in Florida.

It looks like it's working well for him, the RAF Volmet and Shannon Volmet signals towards the end of the video come in as strong as they do in the UK.

https://youtu.be/Xv_JtaoYD0A

Regards,

Chris


loop antenna construction ideas.

lee295012@...
 

i tried making a loop with 4mm copper wire and found the reception very poor, i read on a prior post it should have used something thicker to lower resistance.

so what should i use for an attic install, i see on ebay you can buy copper tape or do have some RG213 up there it might be long enough.
how long should it be, 3 Meters enough?

using the CCW HF/VHF Loop antenna amplifier.


ACTIVE BROADAND ANTENNA How do I improve HF performance?

obrianboru@...
 

My first posting here...I think I maybe posted earler it in the wrong place .....duuuh ....so here it is again!

I have the earlier version of this excellent antenna.It does a great job on UHF and VHF and I'm about to test it on HF.

http://www.crosscountrywireless.net/broadband_active_antenna.htm

Chris states he redesigned it to make it more efficient on HF by adding a new ferrite.
I would appreciate advice as to how I might modify my earlier version of this antenna  to achieve the same effect; I assume the ferrite on the later version helps to cut common mode current on the outer sheath of the coax and of course reduce unwanted rf pickup by it too.
Any info on the best type of choke I could add....ferrite type...31,43,73, and windings, etc., would be very welcome.
73 to Chris and all from Jeff, 2E0CIT


Re: : Revised Broadband Active Antenna

obrianboru@...
 

I have the earlier version of this excellent antenna.
Chris states he redesigned it to make it more efficient on HF by adding a new ferrite.
I would appreciate advice as to how I might modify my earlier version to achive the same effect; I assume the ferrite on the later version helps to cut common mode current on the outer sheath of the coax and of course reduce unwanted rf pickup by it too.
Any info on the type of choke I could add....ferrite type...31,43,73, and windings, etc., would be very welcome.
73 to Chris and all from Jeff, 2E0CIT


Re: SDR4+ Mirrored display

Ian Bontoft
 

Thanks Chris
I need to 'park it' for a few days due to work pressure (sure you know the feeling) but will try that and let you know the outcome.
I am very much aware that I got technical help on a 5 year old discontinued product over a bank holiday weekend.
It does not get much better than that!
Thank you very much for your assistance
Regards
Ian
G4ELW


Re: SDR4+ Mirrored display

Chris Moulding
 

That's normal procedure with HDSDR and CFGSR.

You are back to the original problem. It appears that your computer is seeing the USB sound card in the SDR-4 as a mono card even though the advanced sound card settings show that it isn't.

It's very unlikely that the receiver developed a fault at the exact same time that you updated the operating system but for the sake of completeness it's worth checking the IQ output from the receiver.

if you have a set of headphones with a 3.5mm plug try connecting them to the IQ port (that's the 3.5mm socket nearest the BNC plug).

If the IQ output is faulty you will only hear one channel or both channels will be identical and sound flat as a mono output does.

If the IQ output is correct you should hear the 90 degree phase shift between the channels give a unique hard to describe sound effect on the signal. It's best heard if you tune to a strong signal near the centre of the display.

Regards,

Chris


Re: SDR4+ Mirrored display

Ian Bontoft
 

Just a quick update, HDSDR running but still mirrored.
CFGSR is open until I run HDSDR and then it disconnects
When HDSDR is closed then CFGSDR shows as connected again
If that helps......


Re: SDR4+ Mirrored display

Ian Bontoft
 

Thanks Chris
That got a little further.
The installer that you mentioned installed the driver to a separate directory on the C drive
All seems well in device manager but it would appear that I still have an issue with Si570
Any thoughts on that one?
Many Thanks
ian


On Sun, Aug 30, 2020 at 8:20 PM Chris Moulding <chrism@...> wrote:
The libusb-Win32 driver is used by many USB devices. It looks like Windows 10 has identified it as being used with another USB device.

This driver is used by the SDR-4 receiver to send frequency control information to the receiver.

The full details of the firmware used in the SDR-4 receiver is shown on this web page:

https://pe0fko.nl/SR-V9-Si570/

About half way down the web page the section "Install the PC driver software automatic" gives a link to a small program that installs the DG8SAQ-I2C driver.

The USB sound card in the receiver is a Texas Instruments IC that appears as a standard USB audio codec that is automatically recognised by every operating system although Windows 10 identifies it as a default mono microphone.

Regards,

Chris


Re: SDR4+ Mirrored display

Chris Moulding
 

The libusb-Win32 driver is used by many USB devices. It looks like Windows 10 has identified it as being used with another USB device.

This driver is used by the SDR-4 receiver to send frequency control information to the receiver.

The full details of the firmware used in the SDR-4 receiver is shown on this web page:

https://pe0fko.nl/SR-V9-Si570/

About half way down the web page the section "Install the PC driver software automatic" gives a link to a small program that installs the DG8SAQ-I2C driver.

The USB sound card in the receiver is a Texas Instruments IC that appears as a standard USB audio codec that is automatically recognised by every operating system although Windows 10 identifies it as a default mono microphone.

Regards,

Chris


Re: SDR4+ Mirrored display

Ian Bontoft
 

Thanks Chris
No luck with that unfortunately.
Having played around I decided to do an re-install but now can't get the software working.
Whenever I try to point the software at the drivers folder it tells me that the best driver is already installed
Could you point me in the right direction here?
Regards
Ian


Re: SDR4+ Mirrored display

Chris Moulding
 

Hi Ian,

Everything looks OK with the settings.

I'd try changing the soundcard settings in the Microphone Properties and change them back just to check that any changes are being reported correctly.

Updates in Windows 10 have caused a few problems for sound cards recently. Just checking a HDSDR session on Windows 10 I have running remotely in the workshop reveals that the soundcard had changed to 44.1 kHz with the recent update.

Something subtle has changed in the recent Windows 10 update...

Regards,

Chris


SDR4+ Mirrored display

Ian Bontoft
 

Evening all
Sure that this must have been covered before but can't find it.
I use a SDR-4+ as a panadaptor on a TS5980sg - or at least I did until Windows 10 decided to update today.
After the update the display became 'mirrored'.
Having had problems with sound card settings after an update before I played around with these but could not resolve it.
Tried rolling back to the previous version of windows but still the same.
Device manager says that all is OK with USB ports etc and I think that the leads are OK.
Would someone mind checking my settings as per attached to see if I am doing anything silly?
Many Thanks
Ian
G4ELW

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