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Date
Re: Harmonics and Relay Replacement
I've never taken apart one of the relays that the uBitx comes with. But might be possible to grind off the plastic cover with a dremel tool first, then pluck the pins out one at a time with a needle
By Jerry Gaffke · #60577 ·
Re: Harmonics and Relay Replacement
https://www.arrow.com/en/products/v23105a5403a201/te-connectivity will get you the relays at the cheapest price in the USA that I know of They even have free overnight shipping. NO absolutely do NOT
By Jim Sheldon · #60576 ·
Re: Harmonics and Relay Replacement
Jim: What are the actual part numbers of the Axion relays and where are you ordering them from? Did you need to use a PCB oven to remove the relays? What was your technique? I¡¯m sorry if these
By David Posthuma · #60575 ·
Re: Simpler spur fix
In post? ? ?/g/BITX20/message/60519 Lawrence Galea pointed out a Hong Kong source for Axicom relays at $0.98 USD for quantity 1, $0.60 USD for quantity 1000.? If those are
By Jerry Gaffke · #60574 ·
Re: Harmonics and Relay Replacement
I have another V4 board that I'm going to build up, but I'm waiting on a special 3.2" Color TFT touch screen display (NOT a Nextion) for use with the Trimuvirate Skonk Worx "BITeensio" controller
By Jim Sheldon · #60573 ·
Re: Harmonics and Relay Replacement
Great find, Sarma, as the *world* continues to look into this problem. I'll run a test later today with the 1mH inductor isolation of the relay coils and then see the effect of adding a 10nF capacitor
By Kees T · #60572 ·
Re: Harmonics and Relay Replacement
Good Morning Jim, Thanks for entertaining the idea.? Your shared data maybe useful as you have shown same board and relay with different measured results. For that particular board and the
By Gary Anderson · #60571 ·
Re: Harmonics and Relay Replacement
Thanks for those pictures, Sarma. To me, that seems to indicate even closer coupling from the relay armature to the coil. Bad for RF. 73 Kees K5BCQ
By Kees T · #60570 ·
Re: Harmonics and Relay Replacement
This is a cool find. Nice read.
By Joe Puma <kd2nfc@...> · #60569 ·
Re: Simpler spur fix
Sorry Owen, Missed your reply. I put the inductors in a convenient place without obliterating the component legends. The seller on eBay had mentioned that they were Murata, the size may be 1210,
By Raj vu2zap · #60568 ·
Re: Simpler spur fix
I'd like to second this question about the required inductors. Is it that the SMD inductors have a lower Q, or is it the smaller physical size, or the change in position, or a combination of all these
By Michael Maiorana · #60567 ·
Re: Harmonics and Relay Replacement
Interesting link by this Italian guy, surely not a macaroni one hihi, he also says to add a capacitor across (?) the coil.
By iz oos · #60566 ·
Re: Harmonics and Relay Replacement
Regarding Filters and axicom realy towards band switching? , i saw an useful link. ?http://www.i1wqrlinkradio.com/antype/ch97/chiave50.htm Perhaps it helps. regards sarma ?vu3zmv
By MVS Sarma · #60565 ·
Re: Harmonics and Relay Replacement
I had an old Panasonic DS2E relay. Here are top and side exploded photos. Sorry for lack of clarity The contacts can be seen mounted on either side of the relay. The armature moves sideways pulling
By MVS Sarma · #60564 ·
Re: Account issues
Turn off 2-Step Verification * Open your Google Account. * In the "Sign in & security" section, select 2-Step Verification. You might need to sign in. * Select Turn off. * A pop-up window will appear
By Raj vu2zap · #60563 ·
Re: Recommended mods for spurs and harmonics
Has anyone tried changing the attenuator from 6db to a 3db one? 73 NIck VK4PP
By Nick VK4PP · #60562 ·
Re: Account issues
Mike AI4NS What is this "2-factor authentication with Google" that you mentioned? I just looked at your member profile on the BITX20 site and see nothing like that on Groups.io. You are set for All
By Arv Evans · #60561 ·
Account issues
I was using 2 factor authentication with Google. It is still set for my groups.io account, and I need to get it turned off. How do I contact a group admin or someone that can help fix my account? Mike
By Mike Short <ai4ns.mike@...> · #60560 ·
Recommended mods for spurs and harmonics
There were a bunch of spurs coming out of that first mixer into the 30mhz LPF on transmit that were below 30mhz. One in particular (first flagged by Allison) was at? (45mhz - Carrier), so
By Jerry Gaffke · #60559 ·
Re: Spurs and Harmonics
OK, 3 more plots.? Mouser just delivered. The first one is with 680uH and the second is with 1mH. That's about 8dB better at 25MHz and below when compared to a plain uBITX "16 pin" relay. The third
By Kees T · #60558 ·