14-02-2016, 08:22 AM
(This post was last modified: 14-02-2016, 08:23 AM by Radio Fixer.)
"Long coax cable runs shouldn't give any noticeable losses on MW and short waves, most likely the problem is impedance matching, a 50 ohm cable is hardly likely to match an old valve radio aerial connections that are high impedance.
Try making a little matching transformer with a ferrite ring at the radio's A & E sockets, I've found this helps no end."
Its odd though Trevor as there was much more gain with the aerial on a short coax to the radio, so unless I damaged something with say a short on the line, when fitting the BNC's and having a little trouble, then it must be cable loss. I did try a balun and it had no effect, making reception worse ... what is the impedance of a broadcast radio anyway and it isn't constant across the bands.
Will have a read of the link.
My Wellbrook is good, being a later high gain version, and I can listed to R4 for example day and night completely interference free.
thanks Gary
Try making a little matching transformer with a ferrite ring at the radio's A & E sockets, I've found this helps no end."
Its odd though Trevor as there was much more gain with the aerial on a short coax to the radio, so unless I damaged something with say a short on the line, when fitting the BNC's and having a little trouble, then it must be cable loss. I did try a balun and it had no effect, making reception worse ... what is the impedance of a broadcast radio anyway and it isn't constant across the bands.
Will have a read of the link.
My Wellbrook is good, being a later high gain version, and I can listed to R4 for example day and night completely interference free.
thanks Gary
