Date   
Re: Modular BiTX40

ON6RF
 

Wow...
Just wow.

I can't tell you how good I felt when I saw your post... Congratulations on finishing this build! It looks really nice! And kudos for using it as learning material for your classes :)

Did you find any design errors on the PCBs?

I'll have to finish my version one day... :3

73 de Manoel - ON6RF

Re: Something has been blown

César EA3IAV
 

Thank you Arv

It is weird. I was adjusting the pa with the blue squares and the fuse blew. I changed the fuse and it happened again. It was like that until i changed the transistors... i have quite a few.
now still no power out visible through power meter even in lowest selectir (2w mode)
0,5amps while ppt but as i speak there is no increase on that 
i can hear myself in a close receiver  though...
i feel like these fets are bad

what else could br the reason to not output power?
what is that round blue trimmer for?

i do receive fine btw

i am going tonmy local electrinic shop to buy more fets and fuses 😟

Re: remote display was Apache Case on Sale

Rod Davis
 

Jack,

I used 6 inch Dupont wires with no shield-no apparent problems.

Rod KM6SN



On 01/26/2018 06:43 AM, Jack Purdum via Groups.Io wrote:
I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com

Re: remote display was Apache Case on Sale

Jack, W8TEE
 

That's good news! I'm thinking of using ribbon cable and grounding every other wire.

Jack, W8TEE



From: Rod Self <km6sn@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 11:35 AM
Subject: Re: [BITX20] remote display was Apache Case on Sale

Jack,
I used 6 inch Dupont wires with no shield-no apparent problems.
Rod KM6SN


On 01/26/2018 06:43 AM, Jack Purdum via Groups.Io wrote:
I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com



Re: Something has been blown

Arvo W0VRA
 

On Fri, Jan 26, 2018 at 08:23 am, César EA3IAV wrote:
i am going tonmy local electrinic shop to buy more fets and fuses 😟
At least you have a local shop to buy something like that!

Slack Client group

Richard E Neese
 

Might I suggest we get a slack group going where we can talk real time and interact. living by email is a bit hard as it seems to pile up fast you can make a group with channels like bitx20 bitx40 ubitx so people can join multi rooms and also beable to do  more realtime discussion and interaction ?

Re: Something has been blown

Jerry Gaffke
 

Not very weird.  
First off, RV2 and RV3 are wired backwards, so fully clockwise is minimum bias voltage to the gates.
You must go through the adjustment procedure whenever the IRF510's get changed,
as each IRF510 is different.
The procedure to adjust RV2 and RV3 is here:  http://www.hfsignals.com/index.php/ubitx-tuneup/
Basically, start out fully clockwise on both, then with ptt pressed adjust one for an additional 100ma
of current draw into PA-PWR, and then the other for an additional 100ma.

If RV2 and/or RV3 get turned too far up, the heavy drain currents will quickly blow the IRF510.
It is a very quick transition as you are turning those pots from "about right" to "way too much". 

Jerry


On Fri, Jan 26, 2018 at 08:23 am, César EA3IAV wrote:
It is weird. I was adjusting the pa with the blue squares and the fuse blew.

Re: uBitX - Replacement microphone

Jerry Gaffke
 

Search for "baofeng" in this forum and you get dozens of hits, 
Here's one:   https://groups.io/g/BITX20/message/25195


On Fri, Jan 26, 2018 at 07:52 am, Sajid Rahum wrote:
For the microphone, has any one used regular Baofeng/Wouxun hand microphone/speaker.

Re: Something has been blown

Jerry Gaffke
 

I'd leave the round blue trimmer where it was set at the factory.
It adjusts how much transmit signal power is sent on to the IRF510's.


On Fri, Jan 26, 2018 at 08:23 am, César EA3IAV wrote:
what is that round blue trimmer for?

Re: Slack Client group

Richard E Neese
 

From: Richard E Neese
Sent: Friday, January 26, 2018 12:05 PM
To: BITX20@groups.io
Subject: [BITX20] Slack Client group

 

Might I suggest we get a slack group going where we can talk real time and interact. living by email is a bit hard as it seems to pile up fast you can make a group with channels like bitx20 bitx40 ubitx so people can join multi rooms and also beable to do  more realtime discussion and interaction ?

 


Virus-free. www.avast.com

Re: Slack Client group

Rob Snow
 

I was thinking the same thing, something a bit more interactive than an email list.  I'll sign up.

Re: Slack Client group

Arvo W0VRA
 

One of us set up a discord group.  Many joined, few are on.

https://groups.io/g/BITX20/topic/7355353#35099

Re: Second batch of uBITX shipping? #ubitx

K9WIS
 

I ordered on Dec 14 and have not heard from them since...I did hear rumor shortly after I ordered that it wouldnt ship until the end of January..That day is fast approaching and still no word. Maybe we need to bring this project onto US soil..
Brian K9WIS

---- mikael.madsen@... wrote:

Someone posted that order date 14th december had been shipped but that was some days ago.

Anyone with a later order date later than 14th been informed of shiping yet?

Re: uBitX - Replacement microphone

 

Sajid : 

I am using a Koss CS-100 Computer headset on my BITX40 with excellent results. These cost less than $US20. 
I have tried a couple of other inexpensive Computer Headsets and have found that with some the microphone is 
not sensitive enough for use with the BITX (i.e. output is very low). 

 I have also used a more expensive Yahama CM-500 that works very well.
The nice thing about computer headsets is that the non-USB models normally use 3.5mm stereo plugs for both Headphone and 
mic connections, making it easy to get jacks and to drill appropriate sized holes in your enclosure.

Cheers

Michael VE3WMB 

P.S. For PTT I am using large momentary switch mounted in a plastic pill box with a 3.5mm stereo jack on the bottom. This allows me to 
use a normal 3.5mm audio cable to connect it to the rig. 

Re: Modular BiTX40

Mike Doty
 

Hi Manoel,
My group has had a lot of fun working on this project.  With winter upon us (lots of snow), and living up in the mountains in the northwest U.S., getting together for classes is a challenge.  We have had two classes to date and the group has completed assembling and testing the audio amps board, the 3 bidirectional amps,  the low pass filter, and installed all of the SIP sockets on the motherboard.  Our next class is scheduled for 17 Feb and the plan for this session is to complete and test the crystal filter, the mixer, the product detector, and the VFO.  We'll save the PA module for last along with building the external VFO (Si5351).  I did find that on the analog VFO it was almost impossible to eliminate the drifting so I decided not to install those components since we will be using an external VFO anyway.

The only fault I found with any of the boards was that you didn't include pads to connect M1/M2 from the relay on the PA module to the audio amp module.  I worked around this by soldering two wires with a header to the relay contact pads on the PA module.  The header plugs in to pins on the motherboard with traces running to the audio amp module.

Again, it was terrific of you to share your work on Hackaday and the experience that my guys are getting from building this transceiver is invaluable.  If you will email me direct I would be pleased to mail you one of the motherboards that I designed for the project as my way of saying thank you.

--73-- Mike  --  W0MNE

Re: IRF510 amplifier failures

Jerry Gaffke
 

The RD15HVF1's should be operated at not much more than 12v.
At 12v, the IRF510's would survive just fine with no antenna connected.
That's an infinite VSWR.

So not obvious that this is a solution to blown FET's.
Though I do think the the Ids curves go up more slowly as Vgs increases on the RD15HF1's,
which makes RV2,RV3 not so touchy.
And the RD15HF1's might be easier to drive at 30mhz.
If you do swap them in, let us know how much power you get at 30mhz.

Jerry, KE7ER


On Fri, Jan 26, 2018 at 03:54 am, KD8CGH wrote:
Wouldn't it be better to change to a RD15HVF1 for high VSWR

Re: Slack Client group

David Arthur
 

See my signature below for a link to join the Discord. For all intents and purposes, it's the same as Slack. 

3-5 people are usually active, 51 people have logged in at one point so far.

Cheers!
--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc

Re: remote display was Apache Case on Sale

Rod Davis
 

Jack and All,

attached 2 pix of remote display. Note that I used DuPont wires that came as a flat-group, not the helter-skelter loose wires.
Probably helps reduce noise to some degree.

The ubitx is in an old Heathkit Frequency counter cabinet. When fully assembled, the cabinet looks good, and has
plenty of room for add-ons, and has good cooling louvers.

I will install a fan just behind the finals. The fan will be pulling air away from the finals, not blowing onto them.

Downside of using this case: the 12 inch Nano USB extension cable will not reach the back panel; had to bring
it out through the front.

Rod KM6SN



On 01/26/2018 08:38 AM, Jack Purdum via Groups.Io wrote:
That's good news! I'm thinking of using ribbon cable and grounding every other wire.

Jack, W8TEE



From: Rod Self <km6sn@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 11:35 AM
Subject: Re: [BITX20] remote display was Apache Case on Sale

Jack,
I used 6 inch Dupont wires with no shield-no apparent problems.
Rod KM6SN


On 01/26/2018 06:43 AM, Jack Purdum via Groups.Io wrote:
I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com




Re: BITX QSO Afternoon/Night, Sunday, January 28, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Tom VE3THR
 

good call Ed. The GM (General Motors Employee/retirees) net operates on 7.277.5 - should NOT be a problem but can be used to check propagation during the week.                    GM HF Net Mon thru Sat 1:00pm (HF 7,277.5 KHz). 
I think the mod to RLS 2 will help with the heterodyne we hear AM broadcasters in our 40M ham band in North America. I don't have the new uBITX built yet but I'm hoping it's not a problem too. Using an external DSP and/or notch filter does help a lot.

Re: IRF510 amplifier failures

James Lawrie
 

On same site I found these, made for 30 MHz RD16HHF1. Sooo I bought 10 of them, plan to try in Bix40 first. Data sheet even shows a reference amp design, and they are 12 volt like the other one. If it works I’ll let everyone know.

James Lawrie

On Jan 26, 2018, at 11:32, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

The RD15HVF1's should be operated at not much more than 12v.
At 12v, the IRF510's would survive just fine with no antenna connected.
That's an infinite VSWR.

So not obvious that this is a solution to blown FET's.
Though I do think the the Ids curves go up more slowly as Vgs increases on the RD15HF1's,
which makes RV2,RV3 not so touchy.
And the RD15HF1's might be easier to drive at 30mhz.
If you do swap them in, let us know how much power you get at 30mhz.

Jerry, KE7ER

On Fri, Jan 26, 2018 at 03:54 am, KD8CGH wrote:
Wouldn't it be better to change to a RD15HVF1 for high VSWR