I believe that there is uniform agreement that the relay replacements do reduce the harmonics.? That is the issue that is solved by external low pass filters.
The spurs issues for 20m and higher bands is not solvable with an external filter, as the spur is in the band being used.? There are two fixes for this, one that has been verified by Ashhar and Raj, and one that Raj came up with before Ashhar developed his solution.? Both do reduce the spurs issues per tests by multiple people, INCLUDING the manufacturer of the uBitx kit.
The topic has been worked to death.? I have gotten my answer on how to fix my rig, have ordered the parts and will be making the changes.
The changes are:
for Harmonics, replace KT1/2/3
For spurs: install LCL low pass filter per the following and up the mixer bias:
/g/BITX20/topic/28088828?p=Created,,,20,1,0,0::recentpostdate%2Fsticky,,,20,2,20,28088828Total parts costs are less than $7.50 including the 3 relays - the most expensive parts
There are a number of how to remove the relays on this site.? Ashhare has pictures of the modes he is recommending.
The ONLY thing not done yet is to post this information on the HF Signals site.? That would make it SOOOO much easier to track down.? (I am still having issues searching on this site, not at all like Google).
Respectfully?
Evan
AC9TU
