Re: Harmonics and Relay Replacement
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I got them from Digikey in 3 days. Had
to order something else, so shipping charges were not an issue.
On 11/1/2018 6:01 AM, iz oos wrote:
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
Il 01/nov/2018 00:03, "Gene Nitschke" <genenitschke@...>
> 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
> 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.
> Gene N2IJF
> From: BITX20@groups.io <BITX20@groups.io> on behalf of Raj vu2zap <rajendrakumargg@...>
> Sent: Thursday, October 25, 2018 12:59 AM
> To: BITX20@groups.io
> 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.
> At 24-10-18, you wrote:
>> That's pretty impressive, Raj.
>> Jack, W8TEE
>> On Wednesday, October 24, 2018, 1:06:11 AM EDT, Raj
>> 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.
>> Example: the first is stock and 2nd is Axicom. The
second needs to be referenced to -1db to compare to
>> 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.
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