Pete KE9OA wrote:
Oftentimes, it is the type of ferrite material used in the mixer baluns.
Also, it could be that low Q caps are being used in the lower bands. I have
both an NRD-515 and an NRD-91. Both of these receivers exhibit rolloff below
700kHz.
These comparisions are made, using a Drake R7, Palstar R30, Yaesu FRG-100,
Icom R-75, Lowe HF150, HF-225, and HF-250. I did repair a Kenwood R-2000 a
few years ago, and wondered if it had some sort of attenuation below 1.5MHz.
I noticed this same characteristic with a Kenwood R-5000 and an AOR-3030.

Pete


Pete,

A while back you were sending out mods to improve the AR3030. If you
still have them or any more that you discovered I would really
appreciate it if you could pass them along to me.