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 Post subject: TX image rejection
PostPosted: Wed Apr 18, 2018 11:06 am 
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Joined: Tue Nov 21, 2017 1:27 pm
Posts: 2
I have try to use my RS-HFIQ to drive a transverter for 144MHz. May ham neighbours told me that the signal is not clean.
Have checked 28.3 MHz (lo is 28.274 MHz) and it looks that the image rejection is only around -30dB. Lo spurries ion seams to be right, best in high output levels.
Have i missed same settings in HDSDR ?, i think this is implemented in SW not settable longer?
Soundcard is Startech 96KHz USB Stereo Sound Card, or is problem in the laptop soundcard.
I have use a simple spectrumanalyzer and a transceiver to check spurious and i think it is as in picture attached.

Thanks for advise !
Or is the RS-HFIQ fault ?

BR Leif SM4HNG


Attachments:
File comment: Spectrum screen dump
RFExplorer_SpectrumAnalyzer_2018_04_18_16_57_51.png
RFExplorer_SpectrumAnalyzer_2018_04_18_16_57_51.png [ 66.23 KiB | Viewed 1304 times ]
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