|
I believe that the replacement with the Axicom relays should be a must in any case. I hope they will soon arrive... to make some rudimentary check... bought them on a non-sale price and still been waiting for weeks... seems like they sold them being short... Il 01/nov/2018 00:03, "Gene Nitschke" <genenitschke@...> ha scritto:
> > Sorry to ask but I been offline for a few weeks and the subject seems to have died out (after reading past posts).? So is there a final solution for the spurs/harmonics for the V3 uBitX? > > Axicom replacements (soldered directly to PWB)? > Axicom replacements with SMD inductors? > K5BCQ uBITX Relay Switched LPF/BPF board? > I have an unbuilt V3 that I am not sure if I should even complete.? I want to be legal but do not have a lot of test equipment so verification will be difficult. > > Thanks, > Gene N2IJF > > ________________________________ > From: [email protected] <[email protected]> on behalf of Raj vu2zap <rajendrakumargg@...> > Sent: Thursday, October 25, 2018 12:59 AM > To: [email protected] > > Subject: Re: [BITX20] Harmonics and Relay Replacement > ? > The before relay pic has slightly degraded performance due to the relays being mounted on > sockets. This add a few mm extra length to the leads to the contact and increases coupling! > > The second is Axicom soldered directly on PCB. > > With Axicom my boards are perfect on 40 and 80. > > Raj > > At 24-10-18, you wrote: >> >> That's pretty impressive, Raj. >> >> Jack, W8TEE >> >> On Wednesday, October 24, 2018, 1:06:11 AM EDT, Raj vu2zap <rajendrakumargg@...> wrote: >> >> >> Jim, >> >> I did? not get much improvement with Axicom in a socket.. soldering directly to board made a big difference. >> The harmonic rejection on lower bands was amazing! >> >> On one board only 20M is a bit off. >> >> Raj >> >> Example: the first is stock and 2nd is Axicom. The second needs to be referenced to -1db to compare to >> first! >> >> ? >> ? >> >> At 23-10-18, you wrote: >>> >>> No, I just used the relays.? I was looking for the simplest approach.? I have several other projects that were on hold, giving me time to try the relay swap Mike Doty originally discovered with limited but encouraging results.? >>> >>> I've done all I plan on doing regarding the harmonic reduction.? I shared what I found with the group, got unjustly accused of being a "phoney" and I now wash my hands of this part of the project. >>> >>> Back to improving the available firmware, displays and controller hardware.? >>> >>> Jim > |
