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Re: [Discuss-gnuradio] Can wrong connection of spyverter damage it ?

From: Chris Kuethe
Subject: Re: [Discuss-gnuradio] Can wrong connection of spyverter damage it ?
Date: Wed, 16 Dec 2015 16:12:06 -0800

Smoke? No signal? Distortion? Increased noise? I don't have one and I've never seen the schematic.

I'm totally guessing, but maybe you got lucky. I'd guess that if you'd cooked it, you'd get nothing at all... then again, when the amplifier in a hackrf is damaged, it usuall just turns into something like an attenuator. This is a great opportunity for you to learn more about your RF environment, and about designing experiments.

- does the problem occur with shielded USB cables? Ferrites? Better RF cables?
- does the problem occur with a disconnected antenna? With a terminated input?
- airspy's lower end is 24MHz, spyverter's upper end is 60MHz. How similar does the 24-60MHz range look for actual signals, shifted and unshifted?
- compare your 24-60MHz performance with and without the spyverter connected (but not powered).
- can you test with a different receiver (hackrf, usrp, another spyverter) - maybe those strange signals are actually part of your local environment.
- can you detect the spyverter's LO leakage? Is its frequency stable?

That should be a good start.

On Wed, Dec 16, 2015 at 3:54 PM, Patrick Sathyanathan <address@hidden> wrote:
Hi Chris,
Thanks for the info. What would the symptoms of a spyverter failure be ? I tested it with a shortwave loop antenna and it picks up the local AM stations fine with sdrsharp. But some bands the spectrum display a series of evenly spaced spikes that are not AM signals. Could this be due to damage ?
I posted the same question to the airspy contact address but have got no response. I have found the airspy folks to be less than helpful for other queries.

From: address@hidden
Date: Tue, 15 Dec 2015 16:24:49 -0800
Subject: Re: [Discuss-gnuradio] Can wrong connection of spyverter damage it ?
To: address@hidden
CC: address@hidden

It it quite possible that you damaged it. You should contact the airspy folks to be sure though - http://airspy.com/contact/

On Tue, Dec 15, 2015 at 4:18 PM, Patrick Sathyanathan <address@hidden> wrote:
I recently purchased the airspy/spyverter combo. The spyverter did not have any markings indicating antenna input and output. Assuming that the lettering on the top of the two devices lined up I initially wrongly connected the antenna input of spyverter to the input of the airspy and ran sdrsharp with the bias supply enabled. Eventually after much web surfing I was able to find a picture indicating the correct connection and I followed that.
Does anybody know  if the bias supply from the airspy could have damaged the spyverter ? Also any pointers to a forum that might have the answer would be appreciated.
Thanks for any help,

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