Date   
Re: Help to point me into right direction

Tommaso Ravaglioli
 

Hi Robert,
I think this topic is quite OT in this group.
I have quite a lot of experience working ISS and it is even different
from working satellites.
Please write me, and I will gladly help.
For the others, please have a look at:
https://issfanclub.eu/

73 de IZ2QYZ

Il giorno mar 26 nov 2019 alle ore 13:13 <forest.roby@...> ha scritto:

Dear All,

I am new to the world of Ham Radio.

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, ,

Re: Help to point me into right direction

Eric KE6US
 

Very doubtful that you are going to find a homebrew rig for 2m suitable for a new builder. I hate to discourage anyone from trying anything, but it might be more satisfying in the end to stick with the ISS goal building as much as you can, while getting a few homebrew or kit HF rigs under your belt. Successfully working the ISS is enough of a learning experience and accomplishment with commercial equipment to be satisfying. In 62 years, I've never done it (hi).

There's a guy who goes around to all the hamfests demonstrating that you can work a satellite with a handheld transceiver and a handheld yagi in the parking lot.  I've seen him twice a few years apart and he was successful both times--unless it was a setup and he was working a friend at the far end of the parking lot.

Eric KE6US

On 11/26/2019 4:13 AM, forest.roby@... wrote:
Dear All,

I am new to the world of Ham Radio. 

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, , 

Re: Help to point me into right direction

Black Wolfe
 

On 11/26/19 7:13 AM, forest.roby@... wrote:
Dear All,

I am new to the world of Ham Radio.

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, ,
Well, I've not done this myself, but the uBitx is not the radio for the task.  This has been discussed on the Baofeng UV-5A site a time or three.  The cheap "5 watt" Baofeng can do this, with a good antenna.  By good I mean high gain.  Home brew tape measure or coat hanger wire Yagi type antennas are the low budget answer. Tracking is generally  hand-held.  Mounted antennas get complicated (expensive) quickly.  There are many sites on-line showing how-to do this.

FWIW: The magic is not so much the radio (assuming cross band capability) so much as the high gain antenna.

Bruce W.  ~KV4OE~

Re: PTT activates menu...

Evan Hand
 

I looked up the VU3SUA case.  It appears to be painted, so insure that the board and antenna grounds are solid.  This may take "star" lock washers and / or removing the paint around the the board and connector fastening locations.  Also be sure to run the shack earth ground to a point on the rig that is solidly grounded to the case.

The pull-up resistors are a good idea as well, though did not need them in my case.

Again, just my thoughts.
73
Evan
AC9TU

Re: PTT activates menu...

Gary Anderson
 

I am glad that Evan spoke up yet again.  Always best to invoke good RF practices.

To further the discussion: I think of this as an "Aggressor" and a "Victim."  RF is the Aggressor and the Nano controller is the potential Victim.
Solution is found when the Aggressor can not overcome the potential Victim.  Evan addresses the RF Aggressor.  What also can be done to make the Victim less susceptible?
I would try external pull-ups on PTT and F_BTN to the 5V on the Raduino board (not directly on the Nano).  Start with ~4.7K pull-ups.  This would make the pull-ups stronger and shunt some RF energy away from the Nano.
I would also disable the internal pull-up on PTT and F_BTN in the software if you have the ability to do so.
This is just a thought experiment, with no real world data, but resistors are cheap, easily available, easy to add and remove.

Rgds,
Gary
AG5TX

Re: Help to point me into right direction

Evan Hand
 

I have not used or operated any of the following.  I am just forwarding what I have found searching the internet.

For operating frequencies and modes:
https://www.amsat.org/amateur-radio-on-the-iss/

For VHF/UHF kits:
http://www.cqdx.ru/ham/do-it-yourself/weekend-project-vhf-qrp-fm-transceiver/

The kit only puts out 1 watt max, so will need an amplifier.
http://pdfstream.manualsonline.com/6/6eabf18f-a997-4c37-a940-579233423ee4.pdf
http://www.ah6le.net/index.php/vhf-solid-state-kilowatts

You will also need a directional antenna with azimuth/elevation capability.  

Of course if you want to home brew everything, then check out the ARRL manuals on all of the above.

Just my browsing info.  Would suggest that you do some browsing as well.
73
Evan
AC9TU

PS: I would also suggest that you try to find another site for help, as this one is focused on the BITX series of designs for HF.  There has been some discussion on an up converter for the uBitx, however I have not seen much traction on that thread.

Re: PTT activates menu...

Evan Hand
 

Steven,
This is exactly what happened to me on my version 4 uBitx that I traced back to RF getting into the radio on the shield of an off center fed dipole.  Only solution was to insure good ground on the rig, snap on ferrite chokes on the outside of the coax (3 before entering the shack and one on the feed to my SWR/Power meter).  I also put smaller snapons on the digital lines to the Raduino.  Bought a kit of them on Amazon.  Be sure the largest fits the outside of your coax.

A possible test is to try the radio into a dummy load on the same frequency as you currently have the issue.  If it does not happen on the dummy load, than for sure the problem is RF feedback.

Note:  I have my uBitx rigs in metal enclosures.  If yours is all plastic, then may need to use some shielding tape on the inside of the case grounded to the braid side of the output connector.

The above is what I found, your problem may be different.

73
Evan
AC9TU

Re: PTT activates menu...

Russ KR0EHM
 

Any other suggestions for KM4WIP and I on how to troubleshoot this? It sounds like there are multiple causes.

Re: Help to point me into right direction

Russ KR0EHM
 

For satellites, including the ISS, I watch this site for pass information:
https://www.n2yo.com/passes/amateur-radio.php

amsat.org is probably the most comprehensive collection of information. And when I’m using my PC I also use gpredict to follow the sats I’m interested in. (But n2yo is faster for me to check passes in the next day or two) 

This is one of my goals too, and I’m new, having just been licensed a few months ago.  I got a bit distracted by HF (as one does)

But the uBitx is an HF radio, not a VHF (and it’s discontinued predecessors the Bitx40 and Minima). it’s also not FM capable, which is what a lot of the easier satellites use for modulation.

I haven’t been able to hit one with my setup yet but here is what I have (and there are countless videos on YouTube of hams using exactly this equipment):
inexpensive handheld VHF radio *cough*Baofeng*cough* 
homebrew tape measure Yagi 2 meter antenna 

Without the Yagi, it will be difficult to be heard with a handheld (or so I hear) - but I have successfully listened to satellite passes many times without it.

I have found that most of all it takes patience because the right satellite and conditions do not come around every day or even every week depending on your location.

all that said there are some HF satellites too, but I don’t know if I could lift a Yagi for HF with one hand :-)

Help to point me into right direction

forest.roby@...
 

Dear All,

I am new to the world of Ham Radio. 

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, , 

Re: PTT activates menu...

Russ KR0EHM
 

I found this thread with the same symptoms
https://groups.io/g/BITX20/topic/33158855#71824

Re: update failure /reset

Mike WA0YCN
 

I would load the 16x2 file from KD8CEC at https://github.com/phdlee/ubitx/releases/tag/v1.20.

update failure /reset

dave
 

hello men help i have screwed up my ubitx 5 while trying ( and failing ) to install a nextion   2.8  how can i reload the basic  v5 software just to get the thing going again in its stock form then i will just leave it alone  dave c  very chastened  gw0nvf

Re: PTT activates menu...

Russ KR0EHM
 

So do you mean the pots are up too high on the amp?

Re: PTT activates menu...

Biju Apkrcl
 

De VU2TDD

 This problem arises due to feedback from linier power amp. Keep away the PA and try

On Mon, 25 Nov 2019, 09:40 Russ KR0EHM, <russ@...> wrote:

I’m having exactly the same problem that I just noticed today but the is the first day I did some real SSB so held down the PTT.

I have the VU3SUA case but not the Nextion display. Do you have the case too? I read on another thread about the volume control being finicky with unintentional grounding because of case flex. I’m going to check that out on mine because I’ve noticed the volume control and mic cutting out on mine if I move it while it’s on.  I have a Uniden mic, the cheapo electret version from Amazon that fit the 4 pin CB XLR that came with the case.

if that’s not it then I hope for both of us my reply to bump your thread gets some attention!

here is the link to the other thread:
https://groups.io/g/BITX20/topic/59354776#72943

Re: PTT activates menu...

Russ KR0EHM
 

I’m having exactly the same problem that I just noticed today but the is the first day I did some real SSB so held down the PTT.

I have the VU3SUA case but not the Nextion display. Do you have the case too? I read on another thread about the volume control being finicky with unintentional grounding because of case flex. I’m going to check that out on mine because I’ve noticed the volume control and mic cutting out on mine if I move it while it’s on.  I have a Uniden mic, the cheapo electret version from Amazon that fit the 4 pin CB XLR that came with the case.

if that’s not it then I hope for both of us my reply to bump your thread gets some attention!

here is the link to the other thread:
https://groups.io/g/BITX20/topic/59354776#72943

Re: Troubleshooting uBitx - newbie #ubitx-help

Ken Gibson
 

Thanks everyone - once I slowed down and put everyone's comments together, I have it receiving quite well now.  I skipped the enclosure PCBs and just ugly wired everything.  Next step will be to put a microphone together and test TX on both the mic and the key. -Ken/N7ELF

Re: AUDIO FILTER

howard winwood G4GPF
 

just integrated a sotabeams af filter in my ubitx v5, you need the lm386 amp circuit sotabeams show in their instructions to provide audio to the speaker.
the original lm386 on the main ubitx board provides the input to the sotabeams filter.
this means you now have 2 volume controls, one controls the input to the filter, i.e set level, the other controls the final audio output.
just ordered a dual coax (concentric) 10k pot prom China, as I do not have room for two separate pots.

Re: V5 Rcv cuts out

 

Hi,

If the relay passes only small signals and nothing else, then it must have some kind of contact maintenance current -- even high quality ones need this.

Here is a service bulletin for one of their transceivers needed adding on because they forgot to do this:  https://www.qsl.net/wb4kdi/Kenwood/TS-430S/Service%20Bulletins/asb0902.html  The bulletin has info on both cleaning the contacts and then setting up the circuit.

The Icom IC-730 also needed a circuit added on for the pre-amp relay which went out too because it switched only small signal and had no maintenace current.

I'm sure such a circuit could be added on to the ubitx if desired.

73,


Mark.

Re: V5 Rcv cuts out

andy@...
 

I should have said it cuts out but greatly reduced signal. Signals are not completely gone. If signals completely dissappeared i would suspect something else.