Did some testing lately, in order to see which of the receivers has got the edge. This book: LF Today: A Guide to Success on 136 and 500kHz indicates that the FRG-100 is seen as being as good as the TS-850. However, the TS-850 is attenuated from 500kHz upwards. The remarks in said book made me to buy a Yaesu FRG-100 some months ago. Prior to that I was able to ebay an AOR AR3030. The AR3030 gave good initial results on the Plumbtenna and the Octaplumb. But what a about a comparison?
In direct comparison the AR3030 gave a WSPR SNR 2dB above the FRG-100. So much to noise. But here comes some more.
In order to keep the receiver isolated from the soundcard, I was using a 1:1 audio transformer in the line. With good success on the Target HF3, which otherwise would have been totally useless.
When using the AR3030, I used the above mentioned cable with no further visible effects. A spectrum made at that time looked like that:
And that's what the FRG-100 sees, (slightly different condx though) using the same aerial and audio cable:
As I have seen that Jan PA9QV, also using a FRG-100 meanwhile, does not see anything similar to that, I started looking for culprits. My first guess was the correct one, finally some luck in life. The isolating audio cable, that worked so well with the HF3 did it. Having it replaced now with a regular one (which came with a computer screen once), the sound-card now receives this audio:
Additionally, but this is not linked to the 1.1kHz issue, I widened the FRG-100's i.f.-filter to 6kHz.
BTW, the condx at time of that reception was very favorable in a NE direction. For the first time I received Radio Rud SK6RUD at 0233z.