FT-817 "dummy" IF filter
In this case, I get up to around 10 kHz without equalizing in DSB (Double Side Band), +/- 10 kHz at RF. But DSB is not usually a problem with Graves.
With this setup I recorded 4 days during the Quadrantids peak looking for head echoes over 3 kHz. And I found a few:
A 5 kHz head echo. Click to enlarge
I found no more than 10 traces of head echoes over 3 kHz during the whole 4 days, do I can conclude large doppler head echoes are quite rare, although quite useful to determine the meteor trajectory (more about this in a later post).
Also, I made an histogram of received meteors:
Histogram of Quadrantids 2016 using Graves radar
For me using Graves the peak was around 13-14 UTC on January 4. It is interesting to see the peak is visible every day at the same time.
Miguel A. Vallejo, EA4EOZ