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Yea but changing the relays looks like the real winner here. Joe

Looking at pic #2 seems to me that adding a 47nF capacitor to ground at each coil terminal as Arv hypothesized would make the uBitx a leap close to be legal compliant with respect to the harmonics.

Merci Laurent! This was my first attempt at upgrading the UBITX with CEC code after hacking the 40 with Allard’s so your comments are very helpful. I will go back and look at that code. Finally last

Hello Scott, it seems we ran into the same troubles :) Well, after digging a little in the code, I found that the current release set by default another display that the default 1602: to get it run,

Here is the second shot inside the Axicom 403 that should have been in the previous post...

For those that are following this topic, last night I "dissected" one of the Axicom 403 relays and one of the HFD27 relays.? Here are the pictures of "what's under the hood".? One shot of the HFD27

Plots of the coupling between N/C contacts on either side of the relay (which will include the armature) and what they look like with the addition of a 47nF capacitor to ground at each coil

i agree with Raj and that an excellent "standard" test configuration, for all to use, would be to look at the coupling between the N/C contacts on both sides which would include the relay armature

That?Abracon ASPI-M3015-R68M-T is good for 4 Amps. Some dinky little inductor in an 0805 package would probably do fine at L5,7 A shielded inductor of some sort could be a plus. Jerry

due to the high current capability i assume that this choke is to be used in DC DC converters and not at RF i.e. 45 MHz! Am 14.10.2018 um 18:36 schrieb Gary Hanson:

Here is a part number for 680 nh smd inductor from Arrow electronics. Data sheet available on product page. Looks like the size is a 1212. I have not tried it yet, but specs look about right

Raj, Rather than just using double shielded coax from the 2 pin RF plug on the uBITX to the BNC, I carefully installed gold plated female SMA connector and that should help some but I'm just using the

So what?exactly are these seniors complaining about? They heard you had a uBitx, and think you should not be using it at all? They somehow checked your harmonics and out-of-band spurs that are 30dB

Much slower this morning but made three more before breakfast. I'm just running of of 8 AA batteries so I think that folks with good antennas heard me and folks without or pointing the other way

Power does not decrease when on 12V for the PA only on 24V. Using a 3 amp supply for the 12V both main board and the PA (when it is on 12V). When I switch the PA to 24V, I use a set of LIPO batteries

Nice! I made a contact to a PA QSO party with my bitx40 too. NY3B 7.191. Tried some others but got frustrated and turned on my Kenwood 430.?? 73 Dave k0mbt

After a lot of investigations (HI !) I found that there is a contact beetween pins 3 and 5? (K3) but there is not any continuity beetween pin 3 and M1 and beetween pin 5 and M2. But continuity is 0K

Jim I agree with you regarding the lowest number of turns. My theory is that the relay contacts are acting as the primary of a current transformer inducing the RF current flowing in the contacts into

Tom - great link, thank you. Do you recommend I wait a while, or is this part good to go? Senior folks in my club bash me 'bout my spurious emissions. They have strongly encouraged me to "work on that

GM Jim, 400mW is 33mA that should be OK for the transistors. I will try lower current one when I find a cheaper source or a vendor who will send me by USPS.