What's new Marty ?
Remi - F1MQJ

"Without adding other relays like omrI on g5 g6 and alike, maybe some might prefer just connect the outputs of the four filters to separate antenna outputs, one for each filter. Isn't more simple? Would it solve the harmonics issue?"

A simple-minded solution that will likely work for the one or more that I'll be using "manually" will be a SPDT switch on the outside end of each filter.   Cut the loooong return traces, rewire existing relays as needed, tiny little perfboard off to the side to hold 3 or 4 switches (depending on how many bands I really care about) and wire the outputs with some coax back into the circuit.   Rewrite software if needed to activate desired relays after a bit of rewiring.   Done   

A slightly more exotic solution would be small printed circuit board off to the side instead of the switches;  wire the output of each filter to another (cheap) relay there;   perhaps add one additional 2n3904 to drive those relays, so the existing 2n3904 isn't overtaxed---but now only 2 relays in filter needed at any time....   Can even put in inductors to the coils or in the power line to prevent signal escaping that way.   Might even add an LED so i can see which filter is in use.   

In both cases, ground the unused filter output when not used.   

Full blown solution is new filter assembly completely, but the above solutions will probably handle my existing boards....  When I had heathkits there were ALWAYS modifications being developed to fix this or that problem with the units.   I have a few DOCUMENTS full of them to refer to when refurbishing those units.

In the long run, likely the bandpass filters (at least a stage or so) prior to power amplifier is probaby a good idea and then a redesign of the output filtering --- a version 5 of this wonderful kit transceiver!

Someone criticized the bitx40 filter or something as "not being enough" -- remember, that if the harmonic is already down 15 dB.....that is 15 dB less filtering required.   Same thing as with desense isolation required for duplexers---cleaner transmitter and hardier receivers require less of the duplexer filters!   

Got to get me a step-attenuator box.....or an HF spectrum analyzer....just got a simpleton VHF/UHF analyzer for $110 and able to see duplexer performance for the first time.    

Cheers,

gordon

The filter components as designed are perfectly adequate once the relay and layout problems are addressed. Yes, there are likely improvements that can be made with optimization but they are fine as is. 

I have removed the filter components from the uBitx and laid them out in a straight line on perf board. It is not pretty but that was not my intent..... I wanted to see how they perform. They perform superbly in this layout.

Photos of the board and the filter profiles are attached.

WA8TOD

Unfortunately, I did not make it clear about the DC power source fusing on the early wire-up version I gave Patrick for his stock Wiki. My assumption was that DC power source fusing would be ahead of the uBitx power jack and the reverse polarity protector. 

The fast blow fuses shown on the wire-up diagram were me being overly cautious about the possibility of excessive current draw, mostly from the PA and had nothing to do with reverse polarity.  In addition to the DC power source fusing I use Anderson Power Poles to insure the correct DC polarity. MVS Sarma fusing/reverse polarity is a better approach than what is recommended by HF Signals. Keep in mind a silicon diode is just a starting point for reverse polarity protection. 

Anyone acquiring, wiring, and using one of Farhan's great low cost radios should realize they are meant for experimenters and tinkers.

iz oos.. re getting cores etc at a reas price 
 an inspiration that might benefit me as I get to find out of this Indian is reliable.

First go to http://homebrewcorner.blogspot.com/p/page-update-642015-gek-baluns-1.html and see if that balun core is interesting to you. then  find Sunil who sells the Ubitx cases on this site  and get the proper email address for this Ganevashan or whatever he is called. Now the price he is asking converts to $21 USD. which is not a bad price if you had to go and order all the bits separately from all over  . Make sure you get the NON inline one which I would guess would be useless to you. Then see if he will sell you  spare core for research .   I would say you would get the whole lot landed in Italia  for $35 USD or so.  Then you can unsolder and retain the current Balun and do all your experiments with the extra core.  You have to get  a working email addr from Sunil because this coot does not answer to the one on the blogspot site.   if it all works I am most interested as I do have some cores but getting a ready to go core in box with fittings at this price  also sounds good.. if you get service from this coot  is of great interest to me. (It could  be everyone in India in RF knows his real email address  but it is all a bit rum to me.)  TEF 

Thanks Raj but no, Glenn is not in the Spam folder.

Bill, VK7MX

Thanks Allison for the feedback. The core I have used must be lossy for conventional transformers. I have just wired a 1:49 transformer using a small binocular core with 8uH at the input and 380uH at the output like the previous lossy transformer and wired in the way and this new one show not measurable SWR without any load which is a good thing. Of course using such small core I can't use it for TX probably even at qrp level. I have not the right cores in my drawer, so I will experiment with iron powder large cores (white, grey etc) maybe increasing the number of turns. Two turns with low permeability toroids at the primary seem to me too little especially below 10mhz.

Check your SPAM folder and if they are there mark as not spam.

I use a prefilter called Mailwasher and I have groups.io domain to friends list.

Hi Tom ,

The uBITX_Manager is OK on my Linux Mint with Mono. I sent a message to Nextion and they answered .....

Posted on: 07-08-2018, 03:54 by Patrick

How to use operating system is beyond Nextion support.

Wine indeed works (other users have done)
- ensure Microsoft .NET 3.5 is installed.

............... but I did not find a solution.

Can anybody explain why I am not receiving Glenn's posts on this subject but I am receiving the responses he receives, such as this from Colin. Yet, if  I go to the group page to view Colin's reply, I can step back to find Glenn's post. Why should they not be appearing as emails, as they had previously, since we moved to groups.io

Bill, VK7MX

..WARNING WArning.re chip subs for audio ref Eddie E - the TDA 7052AT is what Leon used. the  A and non A suffix versions are different in volume control area. Stick with Leon's AGC concept  if you go this way.                  https://www.nxp.com/docs/en/data-sheet/TDA7052A_AT.pdf

Eddie E Lucky day with the socket  the TDA7052 is your friend AGC is built in . I believe Futurlec.com  may still sell it if so it will be just pennies and F does not have any MOQ as far as I know. Never buy just one. Perhaps Leon as per below might do you a deal on two chips (but if he has inventory problems he won't . Don't muck him around. I need him.). May not be pin compat (you work it out ). well you can use a machined pin IC socket to bring out the existing socket to a piece of Veroboard and wing it.  Now look up Ozqrp.com  Find your way to the MST 3 schema via the documents section.   Look at audio section of the schematic . AGC Is is all there. Leon in NSWales . He is owner of Ozqrp has been doing AGC as std on his monobanders for  6 years and he only lives at the bottom of the world !!! .

Notice the L08 reggy driving the TDA... that is because Leon is a Pro. and checks this stuff out.  he has an interesting reversed voltage protection on his PCB too.  No fuse , no crowbar and essentially no voltage drop. 

Without adding other relays like omron g5 g6 and alike, maybe some might prefer just connect the outputs of the four filters to separate antenna outputs, one for each filter. Isn't more simple? Would it solve the harmonics issue?

Hi Nikos,

I downloaded the Nextion editor and tried to run it under Wine on my Mac. The first screen came up, but then it died. The console had lists of things it looked like it could not find. I'm interested in the Nextion display so at some point I put the effort into seeing if I can get it to run on the Mac. The Mac is not the same as Linux, but Wine tries to solve the same issue of running Windows programs as with Linux. If I recall the first time I tried to run the dot-net program I was successful with, Wine stopped and asked me if I wanted to install Mono; which I let it install.

I believe I downloaded Wine directly from the Wine site (https://www.winehq.org), as the versions that installed with Linux installers (and Mac installers like Homebrew) may be very old. 

The program I was able to get to run under Wine was: "/uBITX_MM_1.81/uBITX_Manager.exe".

The version of Wine I'm using is: "wine-3.0.1". It was called wine-stable.

I updated the SD card I was running on the Raspberry Pi, so my experiments with Wine on the Pi are gone. I'm looking around to see if I have any notes as to how I installed Wine. Some of the Raspberry Pi Wine packages rely on QEMU or other virtual machines. But I believe I installed something fairly simple, I may be mistaken (a VM could have been automatically installed), but I believe the uBITX_Manager ran directly on the Pi, by using the JIT compiler in the Mono runtime library. 

If you or anyone else finds a solution, please let us Linux/Mac folks know.

Tom, wb6b

before you rush in with the Tx Rx relay which does a lot of work sugggest you look at this

Belay all that .. Japanese LPF cct sent to the VK who is designing a replacement board.  It gets 5 bands out of three signals ie 00 is also interpreted as a command. as usual old Timmo Fidler went off half cocked but at least the archives kicked in.