Date   
antenna tuner for uBitx

vu3jyt
 

what type of antenna tuner required for uBITX as it has only 10wpower
regards,

Re: antenna tuner for uBitx

Michael Luft
 

what type of antenna tuner required for uBITX as it has only 10wpower
regards,
VU3JYT, Rajan

Impedance matching is important if one wishes to deliver all TX power to the antenna and prevent  final stage to be overheated due to standing waves reflected from the mismatched antenna (load).
Matching the antenna also improves the ability of the RX to receive all the weak signals and nothing is wasted as heat.
Mike
4X1LM   

Re: antenna tuner for uBitx

Arv Evans
 

The type of antenna tuner depends on the type of antenna.  L-network for end-fed
or high impedance antennas.  T-network for medium to low impedance antenna.
Pi-network for dipoles.  It is unfortunate that specifications for ATU's usually do not
include the adjustable impedance range for each band that they cover.

http://www.arrl.org/how-antennas-work

Arv  K7HKL
_._


On Sun, Mar 18, 2018 at 9:25 AM, Michael Luft <milu111@...> wrote:
what type of antenna tuner required for uBITX as it has only 10wpower
regards,
VU3JYT, Rajan

Impedance matching is important if one wishes to deliver all TX power to the antenna and prevent  final stage to be overheated due to standing waves reflected from the mismatched antenna (load).
Matching the antenna also improves the ability of the RX to receive all the weak signals and nothing is wasted as heat.
Mike
4X1LM   


BITX40, are these SA traces as they should be? #bitx40help

Dieter ON4DD Vansteenwegen
 

Hi all,

Built my Bitx40, mostly to learn more about troubleshooting radios. I know a bit about measuring and how things "work" but just from reading theory. Practice is clearly different, and a good way to actually get some understanding.
As a result, my setup and measurements may be flawed from the beginning, though I try to do things the "right" way.

As I didn't receive much when trying to listen to the Bitx40 on my TS-870, I started looking at the schematic and trying to figure out what was going on.

Measurement setup:
Bitx40 through 20dB attenuator into a SA. VFO/DDS frequency set at 7110 kHz, no modulation into the microphone (shorted the pins) except for the screenshot with the 10kHz span.

In the 2MHz span, note the strongest peak is at -12dBm around 7333 kHz.
There's another peak around -18dBm at 7110 kHz (which I suppose is the DDS)
Another peak at 7555 kHz, about -41dBm.

In a 10MHz span, I see peaks at 14.218 kHz (-78dBm, obviously harmonic of DDS freq, right?) and 14.445 kHz (-68 dBm, no idea where this comes from).

I don't have a audio freq generator, will build one to inject a know signal into the mic input.

So, a couple of questions:
  1. As the tranceiver uses SSB, shouldn't the carrier be much more suppressed? Ideally, no carrier?
  2. Is the strong peak at 7333 supposed to be there? That's +6dBc, correct?
  3. What's with the 14445kHz peak? There's no peak at/around 7222 kHz...
  4. If I inject a 1kHz signal into the microphone input, what kind of voltage RMS should I use?
  5. A 1kHz on the input should show up as a 7109 kHz signal, is that correct? I tried some "steady" whistling and got a peak at -8 dBc at 7108.4 kHz and another at 7112.1 around -45 dBc (see the 10kHz span screenshot)
  6. In the 10 kHz whistling screenshot, I suppose the signal (result of the whistling) is at 7108.4 kHz, but -8 dBc. Shouldn't this be much more?

I might be missing something obvious, but have been looking a it for a couple of evenings now.

Thank you,

Dieter
ON4DD

Re: BitX40 case from The Home Depot...

Steve
 

The white panel was cut from a retail advertising sign.  Some kind of "plexiglas", but quite flexible and easy to work and cut- doesn't have a propensity to chip or shatter.  About 3mm thick- I had to countersink the holes where the jacks fit so the nuts would attach.  The brass mounting screws are just ACE hardware stock, with the knurled nuts.  I first tried to attach them with epoxy glue, but that didn't stay bonded to the acrylic case.  Currently, they are affixed with a healthy blob of 3M 5200 polyurethane sealant which is great stuff.  Besides holding the screws solidly, it allows for a small amount of flex, which, I suppose, adds a anti-shock component to the build....This is smaller and much lighter than an ammo can (steel anyway).  Not sure of the RF-resistant properties of acrylic.....;^)  Aloha, Steve.

Virus-free. www.avg.com

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

Pretty quiet again this afternoon! Anyone else out there?
--
John - WA2FZW

Re: Soldering gun or iron

Fred Buecker
 

Let us also not forget the importance of quality solder toward the end-goal of a quality job.

-Fred
KC3HMS

On Fri, Mar 16, 2018 at 4:06 PM, Richard Spohn <wb2gxm@...> wrote:
There are two very good youtube videos by Dave Cassler, KE0OG, on
soldering irons, accessories and techniques:

https://www.youtube.com/watch?v=9XW_gkdWJ5U

https://www.youtube.com/watch?v=gqz1xGj_m_E

Hope these help! - Rich WB2GXM



On 3/16/18, Ashhar Farhan <farhanbox@...> wrote:
> I have learnt to live with just about any iron. What matters really is a
> nice clean tip. These days they are tips that don't pit. I like those. Keep
> a good sponge, wipe them often.
> - f
>
> On 16 Mar 2018 9:47 am, "Christopher Miller" <djmalak2k6@...> wrote:
>
>> The images of what I needed minimum. It looks like the station is not
>> available but there are ones with more features around 70$.
>>
>> Chris
>>
>>
>




Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Tom VE3THR
 

Hey john...what freq you on? VA QSO PARTY on and hi power guy on 7.278. Damn easter lilies - only come out once a year.

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Rob Snow
 

I'll be trying all afternoon on 7.277 on my newly built Junkyard uBITX.  Central Texas QTH

73
Rob
AG5OV

uBitX low output power, received audio OK #ubitx

KE0GYC
 

I'm a fairly inexperienced builder and don't know much of anything about debugging issues, so please bear with me.

I ordered my uBitX and I have it set up in a small pelican-style case field-radio style with all the controls on top.  So far it is all stock and I have made no modifications - I am powering it by alligator clips to the appropriate spots on either side of the reverse protection diode, and the only nonstandard thing about it is that it is wired to run an unmodified Baofeng mic.

I noticed I am getting low power output on 40M and 80M.  It originally was putting out around 1-2W.  My received signal sounds fine on a commercial receiver a few feet away.  After I reset the PA bias and adjusted RV1 for maximum smoke, I am still getting only around 4-5W out.  

I did check Q90, and it does not appear to be shorted - Another thread mentioned that as a possible cause of low power out.

I did notice unusually low current draw when I reset the PA bias.  With both pots fully clockwise, I was getting 390ma with PTT down, where the instructions for tuneup say I should expect 470-500ma.  Could this have something to do with it?

Any help is appreciated.

73
KE0GYC

Re: uBitX low output power, received audio OK #ubitx

KE0GYC
 

Another note:  I am only drawing 1200ma on transmit with full modulation (AAAAH into mic), and after adjusting RV1 it is still around 1300ma.

Listening for BITX on Sunday 7277 kHz

Ken Brown <n4so.ken@...>
 

I am set up on 7277 kHz and listening now for BITX stations on SSB, 3 PM Central time.

Ken N4SO

Virus-free. www.avg.com

Re: Listening for BITX on Sunday 7277 kHz

John P
 

Ken, you should post on the thread with the announcement. Most of us that participate monitor that thread to see who is around. 
--
John - WA2FZW

Re: Listening for BITX on Sunday 7277 kHz

Tom VE3THR
 

are you hearing W5ODJ ? He was on 7.278 and decided to move onto 7.277 and calling CQ VA QSO PTY. Not hearing any BITX stations up hear.
Tom VE3THR

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

On Sun, Mar 18, 2018 at 12:35 pm, Tom VE3THR wrote:
Hey john...what freq you on?
I only spent about 15 minutes o 7227. Heard nothing so I took advantage of the slightly warmer afternoon to cut up all the storm damage from the last 2 nor'easters. Big tree limbs all over the back ya6.
 
--
John - WA2FZW

Re: Listening for BITX on Sunday 7277 kHz

Rick Price
 

W5OJD was splattering all over 7.277 here north of Chattanooga. So, I moved up to 7.278 and had my very first QSO with the ubitx. Virginia to SE TN not bad for 8 watts on a Sunday afternoon.  Rick P KN4AIE



From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tom VE3THR
Sent: Sunday, March 18, 2018 4:06 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Listening for BITX on Sunday 7277 kHz

are you hearing W5ODJ ? He was on 7.278 and decided to move onto 7.277 and calling CQ VA QSO PTY. Not hearing any BITX stations up hear.
Tom VE3THR

No signals on 7277.00 kHz

Ken Brown <n4so.ken@...>
 

7277 kHz.  No signals at all starting at 3 PM Central time, 2000 UTC. K4FW is below, calling in the VA QSO party.  I should be able to hear TX and VA.

Anyone actually on?

Ken N4SO





Virus-free. www.avg.com

Re: BITX40, are these SA traces as they should be? #bitx40help

Thomas Sharka
 

If you have a cell phone,tablet or even a laptop/desktop then you have an audio generator.





Sent from Yahoo Mail. Get the app


On Sunday, March 18, 2018 1:41 PM, "news1@..." <news1@...> wrote:


Hi all,

Built my Bitx40, mostly to learn more about troubleshooting radios. I know a bit about measuring and how things "work" but just from reading theory. Practice is clearly different, and a good way to actually get some understanding.
As a result, my setup and measurements may be flawed from the beginning, though I try to do things the "right" way.

As I didn't receive much when trying to listen to the Bitx40 on my TS-870, I started looking at the schematic and trying to figure out what was going on.

Measurement setup:
Bitx40 through 20dB attenuator into a SA. VFO/DDS frequency set at 7110 kHz, no modulation into the microphone (shorted the pins) except for the screenshot with the 10kHz span.

In the 2MHz span, note the strongest peak is at -12dBm around 7333 kHz.
There's another peak around -18dBm at 7110 kHz (which I suppose is the DDS)
Another peak at 7555 kHz, about -41dBm.

In a 10MHz span, I see peaks at 14.218 kHz (-78dBm, obviously harmonic of DDS freq, right?) and 14.445 kHz (-68 dBm, no idea where this comes from).

I don't have a audio freq generator, will build one to inject a know signal into the mic input.

So, a couple of questions:
  1. As the tranceiver uses SSB, shouldn't the carrier be much more suppressed? Ideally, no carrier?
  2. Is the strong peak at 7333 supposed to be there? That's +6dBc, correct?
  3. What's with the 14445kHz peak? There's no peak at/around 7222 kHz...
  4. If I inject a 1kHz signal into the microphone input, what kind of voltage RMS should I use?
  5. A 1kHz on the input should show up as a 7109 kHz signal, is that correct? I tried some "steady" whistling and got a peak at -8 dBc at 7108.4 kHz and another at 7112.1 around -45 dBc (see the 10kHz span screenshot)
  6. In the 10 kHz whistling screenshot, I suppose the signal (result of the whistling) is at 7108.4 kHz, but -8 dBc. Shouldn't this be much more?

I might be missing something obvious, but have been looking a it for a couple of evenings now.

Thank you,

Dieter
ON4DD


Re: BitX40 case from The Home Depot...

Steve
 

Oops.  The Husky cases are polycarbonate, not acrylic.....Aloha, Steve.

uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester.

ge_clipboard
 

Hello Ian

While chasing a dx on 30m found another bug.
When RIT is enabled and then going into the Memory Keyer, one can‘t select a Memory except Nr. 0 as then the RIT-frequency is tuned.

73, Gerald - HB9CEY