70095Re: [softrock40] Re: What's the most TX power anyone has amplified an RXTX to? Just out of curiosity...
- Nov 16, 2012On 16/11/12 14:40, Chris Wilson wrote:
>I know people are using the SDR-CUBE (a SR v6.3 with smarts) with 50W
>> ----- Original Message -----
>> Subject: [softrock40] Re: What's the most TX power anyone has
>> amplified an RXTX to? Just out of curiosity...
>> Another related question may be "What is the largest spurious
>> signal transmitted from a Softrock, (or other SDR)."
>> On WSPR "Chat" the other day I came across someone who was
>> transmitting without having checked his TX IQ was correct. Transmitting
>> on the wrong frequency.
>> He also knew nothing about setting TX IQ balance so when the IQ was
>> set correctly his image may have been only 25dB down.
>> If he had a fault he could have been transmitting simultaneously on
>> both frequencies without knowing. The same as "mirrored"
>> A good understanding of what is involved is necessary before
>> amplifying mistakes. Any soundcard SDR transmitter needs careful
>> setting by someone who at least understands the basics. A receiver must be used to check.
>> I sometimes wonder when immediately after building a Softrock
>> somebody says "I want more power". It took me quite a while to get a
>> fair understanding of the Softrock and software.
>> 73 Alan G4ZFQ
> 16/11/2012 14:36
> As I said, I was just curious as to how much power people
> realistically run from these things, and my thoughts were whether they
> could be made clean enough to be unobtrusive at high power output
> levels, or whether the fact the majority are QRP tends to hide any
> nasties from the fellow spectrum users. Is a soundcard based SDR TX
> bound to be dirtier than a good conventional transmitter? Or can the
> Softrock RXTX package be amplified to serious levels without becoming
> unsociable, and without major doctoring?
73 ... Sid.
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks
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