[amsat-bb] AirSpy Mini VS Funcube Dongle

[Paul Stoetzer]

Most SDR programs have an option to eliminiate the DC spike. I've been
using Gqrx and can't specifically remember how to do it in others, but
in Gqrx it's right on the receiver options tab.

73,

Paul, N8HM

On Mon, Oct 23, 2017 at 3:58 PM, Paul Andrews <w2hro.fn20 at gmail.com> wrote:
> AMSAT Community,
>
> I have the same problem and would really appreciate any information on
> a fix.    I have read about the origin of the DC Offset problem but I
> don't see any way to correct the problem.
>
> I'm a happy owner of three (3) Funcube Dongles.  One of the best
> values in SDR equipment.
>
> 73 - Paul - W2HRO
>
>
>
> On Mon, Oct 23, 2017 at 7:53 AM,  <vk4tec at tech-software.net> wrote:
>> How can I get rid of this DC spike in the Funcube Dongle ?
>>
>> Andrew
>>
>> -----Original Message-----
>> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of
>> vk4tec at tech-software.net
>> Sent: Monday, 23 October 2017 9:13 PM
>> To: AMSAT <amsat-bb at amsat.org>
>> Cc: 'Australian APRS Users' <ozaprs at aprs.net.au>
>> Subject: [amsat-bb] AirSpy Mini VS Funcube Dongle
>>
>> Signal Comparison of AirSpy Mini vs Funcube Dongle PRO+
>>
>>
>>
>> 432.440 MHz
>>
>>
>>
>> AirSpy Mini SDR 3/6 MHz
>>
>>
>>
>> IF = 9
>>
>> Mixer = Max 15
>>
>> LNA = Max 15
>>
>>
>>
>> Noise Floor -80 db
>>
>> Signal Peak -50 db
>>
>> S/N = 30dB
>>
>>
>>
>> Funcube Dongle Pro + 192 KHz
>>
>>
>>
>> LNA = Yes
>>
>> Mixer = Yes
>>
>> IF Gain = 11
>>
>>
>>
>> Noise Floor -80 dB
>>
>> Signal Peak = -35 dB
>>
>> S/N = 45 db
>>
>>
>>
>> RTL-SDR Dongle 2 MHz
>>
>>
>>
>> Did not compare at all - Noise Floor -50 dB / Bad S/N
>>
>>
>>
>> HackRF
>>
>>
>>
>> Did not compare - was more a GNUradio Tool
>>
>>
>>
>> The Funcube Dongle was 15 dB better than the AirSpy Mini
>>
>>
>>
>> But remember Fincude SBR is 192 kHz and AirSpy Mini is 3 or 6 MHz
>>
>>
>>
>> Best: Funcube Dongle Pro +
>>
>>
>>
>> Andrew
>>
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>> _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb