Date   

Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sun, Jul 21, 2019 at 03:23 PM, prog wrote:
No worky. It requires an external amplifier to do something useful.
Update. A bigger box with less turns works better. Lower overall signal level, but better SNR.
This makes another option for low frequencies.











Re: Help with Airspy R0 and Elad S2

prog
 

On Sun, Jul 21, 2019 at 11:07 PM, hinghamdx wrote:
Thank you....USB port was the issue. At one point over the winter I must have switched ports. Computer has always handled both fine so I knew it wasn't processing power. Thanks again.

Keith
You are welcome. A quick note for later reference: Modern Intel computers have two USB controllers. So, if you need to run two very demanding applications simultaneously, try to find USB ports that are routed to different controllers internally.


Re: SDR# r1703 and HF+ Firmware r3.0.0

prog
 

On Sun, Jul 21, 2019 at 07:09 PM, <carsten.rieck@...> wrote:
Could anyone comment on the zero/low-IF question?  Thanks
Zero-IF and Low-IF are receiver architectures. They have many pro's and con's depending on the situation.
You can check this document for the details: http://ece.tamu.edu/~s-sanchez/665%20Lect%202-Receiver-Topologies%202009.pdf

Basically, use Low-IF if you need center-tuning and Zero-IF for best image rejection.


Re: Help with Airspy R0 and Elad S2

Keith McGinnis
 

Thank you....USB port was the issue. At one point over the winter I must have switched ports. Computer has always handled both fine so I knew it wasn't processing power. Thanks again.

Keith

On 7/21/2019 5:00 PM, prog wrote:
On Sun, Jul 21, 2019 at 10:54 PM, hinghamdx wrote:
In the past I have successfully used both the original Airspy (R0)
and the Elad S2 during Eskip openings...no problem with recording,
playback, etc. Smooth as silk. Today for the first time this year
(poor eskip season here in the Northeast U.S.) and I'm having
issues. Had the Elad running and then turned on the Airspy and
everything sounded like crap (like everything was under water)and I
hadn't even started recording yet. Can use either alone but not
together....same computer as always. Using SDR# 1703.
Keith
Hingham MA
This looks like a USB bandwidth in the computer.
Are the chipset drivers up to date?
Did you try different ports?


Re: Help with Airspy R0 and Elad S2

prog
 

On Sun, Jul 21, 2019 at 10:54 PM, hinghamdx wrote:
In the past I have successfully used both the original Airspy (R0) and the Elad S2 during Eskip openings...no problem with recording, playback, etc. Smooth as silk. Today for the first time this year (poor eskip season here in the Northeast U.S.) and I'm having issues. Had the Elad running and then turned on the Airspy and everything sounded like crap (like everything was under water)and I hadn't even started recording yet. Can use either alone but not together....same computer as always. Using SDR# 1703.

Keith
Hingham MA
This looks like a USB bandwidth in the computer.
Are the chipset drivers up to date?
Did you try different ports?


Help with Airspy R0 and Elad S2

Keith McGinnis
 

In the past I have successfully used both the original Airspy (R0) and the Elad S2 during Eskip openings...no problem with recording, playback, etc. Smooth as silk. Today for the first time this year (poor eskip season here in the Northeast U.S.) and I'm having issues. Had the Elad running and then turned on the Airspy and everything sounded like crap (like everything was under water)and I hadn't even started recording yet. Can use either alone but not together....same computer as always. Using SDR# 1703.

Keith
Hingham MA


Re: SDR# r1703 and HF+ Firmware r3.0.0

carsten.rieck@...
 

Could anyone comment on the zero/low-IF question?  Thanks


Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sun, Jul 21, 2019 at 03:21 PM, kb3cs wrote:
next try air core wound around a large cardboard box.
No worky. It requires an external amplifier to do something useful.


Re: Ferrite antenna for Airspy HF+ #experiment

kb3cs
 

yes, of course, you are enclosing more area of 'concentrated' flux. next try air core wound around a large cardboard box.

 - 34 (base 23) -


Re: Airspy HF+ in the air...

jdow
 

I would worry intensely about the weight of the USB cables used to reach the computer. You would want some support for the USB cable to take its weight off the box.
{^_^}

On 20190720 11:55:25, prog wrote:
On Sat, Jul 20, 2019 at 08:52 PM, <philippe.nicolas@...> wrote:
Could you confirm the the SMA connector could hold the weight of the HF+
till I order a new cable ?
We do not encourage the torture of SDRs of any kind for any reason.
For a longer life of your HF+, I won't recommend stressing the connectors (SMA and USB) too much.


Re: Airspy HF+ in the air...

prog
 

On Sat, Jul 20, 2019 at 08:52 PM, <philippe.nicolas@...> wrote:
Could you confirm the the SMA connector could hold the weight of the HF+ till I order a new cable ?
We do not encourage the torture of SDRs of any kind for any reason.
For a longer life of your HF+, I won't recommend stressing the connectors (SMA and USB) too much.


Airspy HF+ in the air...

Philippe Nicolas
 

Hello

I got a cable with SMA to connect to the Airspy HF+.
Sadly the cable is a bit too short and the Airspy HF+ is floating in the air from the ceiling with the cable.

Could you confirm the the SMA connector could hold the weight of the HF+ till I order a new cable ?

Thanks


Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sat, Jul 20, 2019 at 07:16 PM, Mike Millen wrote:
But was 9 better than 1?
10 dB better.


Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sat, Jul 20, 2019 at 07:16 PM, Alberto I2PHD wrote:
Should we expect similar results ?
No. The matching circuit is quite different between the two.
The Dual Port needs an external preamp with negative feedback to match the antenna.
Here's a comparison with the antenna alone (same firmware):



Re: Ferrite antenna for Airspy HF+ #experiment

Mike Millen
 

But was 9 better than 1?

Mike - M0MLM

On 20/07/2019 14:18, prog wrote:
On Sat, Jul 20, 2019 at 01:15 AM, Martin Smith wrote:
I a bit curious if tried using Litz wire for the winding, to reduce skin effect losses, it might increase sensitivity at higher frequencies (or possibly just add more noise).
As this antenna is not resonnant, I'm not sure how it will behave. To be tested.
I used a wire with a bigger section and got much better results on a single rod.
Then I used 9 spaces rods with the same wire, and got this beast:


Re: Ferrite antenna for Airspy HF+ #experiment

Alberto I2PHD
 

On 2019-07-20 15:18, prog wrote:

I used a wire with a bigger section and got much better results on a single rod.

What happens if you use that same ferrite antenna not on the Discovery, but on the Airspy HF+ Dual Port ?
Should we expect similar results ?

--
73 Alberto I2PHD
<<< http://www.weaksignals.com >>>



Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sat, Jul 20, 2019 at 01:15 AM, Martin Smith wrote:
I a bit curious if tried using Litz wire for the winding, to reduce skin effect losses, it might increase sensitivity at higher frequencies (or possibly just add more noise).
As this antenna is not resonnant, I'm not sure how it will behave. To be tested.
I used a wire with a bigger section and got much better results on a single rod.
Then I used 9 spaces rods with the same wire, and got this beast:






Re: Ferrite antenna for Airspy HF+ #experiment

prog
 

On Sat, Jul 20, 2019 at 05:06 AM, Brian Gregory wrote:
Does the fact that the winding isn't resonant mean you can use any ferrite rod or does one need to find a rod made of the apropriate ferrite to cover up LF, MF and HF?
Not all ferrite rods are equal. Use one with the permeability suits the frequencies you need.
Try a few different types and check what works best for you.


Re: SDR# r1703 and HF+ Firmware r3.0.0

prog
 

On Sat, Jul 20, 2019 at 09:42 AM, Ian DXer wrote:
I could try the latest FW, but will wait for your feedback first before exploring further.
Thanks Ian. SDR# itself is backward compatible, but the library was not updated in the package and github.
Now everything is updated. Just download SDR# package again. Same SDR# version, new HF+ library.


Re: SDR# r1703 and HF+ Firmware r3.0.0

Ian DXer
 

>They say never deploy on a Friday,..
> Check the latest version of SDR#

Youssef is the latest SDR# R1703 meant to be backwards compatible with earlier HF+ DP firmware releases?
I'm still using R1.7.2 firmware (was going to upgrade the firmware today, until I encountered a problem with latest SDR#).
My HF+ DP works fine with SDR# R1702 & all previous downloaded SDR# versions
SDR# R1703 also works fine with my RTL-SDR,...... but the software wont display signals/waterfall, no audio with the HF+ DP.
The software sees the device & existing FW
Blue LED is on the device etc.
Using Windows 7 64bit.
I could try the latest FW, but will wait for your feedback first before exploring further.
(NB posted here rather than your email as not directly related to new firmware)

Thanks
Ian