Date   
Re: low output power

Soundararajan Ra.
 

if u inject 500 mv at c41 output
c 132 input 200 mv  and at r 136 100 E preset hot end voltage to be 3 volt

On Mon, Aug 21, 2017 at 2:16 PM, jrea79 via Groups.Io <jrea79@...> wrote:
hi!

Raj, Q7 collector has 180mVpp, just a few millivolts on Q8 and Q9 -all bias voltages are ok

Initially I suspected Q8 since I can only measure a few millivolts on its Base and emitter but if I short R81 I got 1Vpp at Q7 collector and the output goes to 3W (even without speaking to the mic) and the receive goes louder

Soundararajan Ra,  I already did the CW mod for Allards sketch and when I TX in cw in only gets about 1w output but if I inject the 7.150mhz from CLK0 at the base of Q13 I got close to 10w output indicating that Q13-Q15 is ok

thanks a lot and 73!
Jonathan/DV2NAH


Re: QRP Labs 5W CW transceiver kit

Master Ice <special@...>
 


My order has been placed! Wheeee :-)
 
Slim G4IPZ

Virus-free. www.avast.com

Re: QRP Labs 5W CW transceiver kit

Hans Summers
 

Hi Alan, all
> QRP Labs are in the process of kitting up a new Mono Band 5W CW Kit for the HAM Bands.
> A great feature for those with minimal test gear or field use is:- B.I.T.E.
> Often found on commercial / Military equipment.
The new QRP Labs kit "QCX" is now available, a single-band 5W transceiver with high performance and packed with features, including a WSPR beacon, built-in test equipment, CW decoder, sythesised rotary-encoder VFO, etc. The kit price is $49 (equivalent to £38.06, 41.73€ at time of writing). Order here: https://shop.qrp-labs.com/qcx . Shipping is $6.30 to anywhere in the world and delivery is tax-free. 
The 137-page assembly/operation manual can be downloaded here http://qrp-labs.com/qcx and includes circuit diagram and comprehensive description of circuit operation. 

Features:
  • Easy to build, single-board design, 10 x 8cm, all controls are board-mounted
  • Professional quality double-sided, through-hole plated, silk-screen printed PCB
  • Choice of single band, 80, 60, 40, 30, 20 or 17m
  • Approximately 3-5W CW output (depending on supply voltage)
  • 7-16V recommended supply voltage
  • Class E power amplifier, transistors run cool… even with no heatsinks
  • 7-element Low Pass Filter ensures regulatory compliance
  • CW envelope shaping to remove key clicks
  • High performance receiver with at least 50dB of unwanted sideband cancellation
  • 200Hz CW filter with no ringing
  • Si5351A Synthesized VFO with rotary encoder tuning
  • 16 x 2 blue backlight LCD screen
  • Iambic keyer or straight key option included in the firmware
  • Simple Digital Signal Processing assisted CW decoder, displayed real-time on-screen
  • On-screen S-meter
  • Full or semi QSK operation using fast solid-state transmit/receive switching
  • Frequency presets, VFO A/B Split operation, RIT, configurable CW Offset
  • Configurable sidetone frequency and volume
  • Connectors: Power, 3.5mm keyer jack, 3.5mm stereo earphone jack, BNC RF output
  • Onboard microswitch can be used as a simple straight Morse key
  • Built-in test signal generator and alignment tools to complete simple set-up adjustments
  • Built-in test equipment: voltmeter, RF power meter, frequency counter, signal generator
  • Beacon mode, supporting automatic CW or WSPR operation
  • GPS interface for reference frequency calibration and time-keeping (for WSPR beacon)
73 Hans G0UPL

Re: low output power

jrea79@...
 

 Soundararajan Ra,

I will do your suggestion and will post the result later

thanks and 73!

Jonathan/DV2NAH

Re: low output power

jrea79@...
 

hi!

Raj, Q7 collector has 180mVpp, just a few millivolts on Q8 and Q9 -all bias voltages are ok

Initially I suspected Q8 since I can only measure a few millivolts on its Base and emitter but if I short R81 I got 1Vpp at Q7 collector and the output goes to 3W (even without speaking to the mic) and the receive goes louder

Soundararajan Ra,  I already did the CW mod for Allards sketch and when I TX in cw in only gets about 1w output but if I inject the 7.150mhz from CLK0 at the base of Q13 I got close to 10w output indicating that Q13-Q15 is ok

thanks a lot and 73!
Jonathan/DV2NAH

Re: low output power

Soundararajan Ra.
 

Correction
7 watt output without modulation

On Mon, Aug 21, 2017 at 2:07 PM, Soundararajan Ra. <vu2rjw@...> wrote:
Connect a 10k resistor on c107 capacitor and feed 9 v dc so that carrier leakage will happened and works in cw mode . 
If the stages  Q4,5,6,13,14 and 15 are ok when pressing PTT with speaking in the mic  u will be getting 7 w CW output .
By this way u identify the problem.
DE
Soundar vu2rjw


On Aug 21, 2017 1:39 PM, "jrea79 via Groups.Io" <jrea79=yahoo.com@groups.io> wrote:
Hi Raj!

I already removed C91 and C92, output just jumped from 1W to 2W

arduino output is at 40mV at USB and zero at LSB even if its disconnected from the bitx board

73!
Jonathan/DV2NAH




Re: low output power

Soundararajan Ra.
 

Connect a 10k resistor on c107 capacitor and feed 9 v dc so that carrier leakage will happened and works in cw mode . 
If the stages  Q4,5,6,13,14 and 15 are ok when pressing PTT with speaking in the mic  u will be getting 7 w CW output .
By this way u identify the problem.
DE
Soundar vu2rjw


On Aug 21, 2017 1:39 PM, "jrea79 via Groups.Io" <jrea79=yahoo.com@groups.io> wrote:
Hi Raj!

I already removed C91 and C92, output just jumped from 1W to 2W

arduino output is at 40mV at USB and zero at LSB even if its disconnected from the bitx board

73!
Jonathan/DV2NAH



Re: Rotary Encoder - Nut size?

MVS Sarma
 

I feel that we can mount it using the two holes on the pcb with suitable spacers.
 However one could try with plastic shft  volume control  mounting screws.
sarma
vu3zmv


On Mon, Aug 21, 2017 at 1:34 PM, Michael Hagen <motdog@...> wrote:

Look at nuts on any cheap import small pot with 6mm shaft?

Mike, WA6ISP


On 8/20/2017 7:44 PM, John P wrote:
I bought a bunch of the KY-040 encoders on eBay a couple of weeks ago, but they didn't come with the nuts to attach them to the panel of anything. Anybody know what size nuts they need. Battery died in my caliper tonight, so I can't even measure the diameter! TIA!
--
John - WA2FZW

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...




--
Regards
Sarma
 

Re: low output power

 

Did you measure the Q7 collector signal level ?

At 21-08-2017, you wrote:
Hi Raj!

I already removed C91 and C92, output just jumped from 1W to 2W

arduino output is at 40mV at USB and zero at LSB even if its disconnected from the bitx board

73!
Jonathan/DV2NAH

Re: low output power

jrea79@...
 

Hi Raj!

I already removed C91 and C92, output just jumped from 1W to 2W

arduino output is at 40mV at USB and zero at LSB even if its disconnected from the bitx board

73!
Jonathan/DV2NAH


Re: Rotary Encoder - Nut size?

Michael Hagen
 

Look at nuts on any cheap import small pot with 6mm shaft?

Mike, WA6ISP


On 8/20/2017 7:44 PM, John P wrote:
I bought a bunch of the KY-040 encoders on eBay a couple of weeks ago, but they didn't come with the nuts to attach them to the panel of anything. Anybody know what size nuts they need. Battery died in my caliper tonight, so I can't even measure the diameter! TIA!
--
John - WA2FZW

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Rotary Encoder - Nut size?

Michael Hagen
 

On mine,  OD is 6.75 mm.  Maybe 0.5 mm thread pitch?

And yep, the picture shows NO Nut!  Nuts...to them.

Mike, WA6ISP
On 8/20/2017 7:44 PM, John P wrote:
I bought a bunch of the KY-040 encoders on eBay a couple of weeks ago, but they didn't come with the nuts to attach them to the panel of anything. Anybody know what size nuts they need. Battery died in my caliper tonight, so I can't even measure the diameter! TIA!
--
John - WA2FZW

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: low output power

 

Remove C91 and C92 as combined they add a capacitance load of 500 pf across the Raduino output
and will cause a reduction of amplitude.

Raj

I already adjusted the output to 8mA for USB/LSB, is there any other way to increase the output?

thanks and 73!
jonathan/DV2NAH

Re: low output power

jrea79@...
 

hello friends!

Just an update
I did Jerry's tip of generating 7.150mhz at clk0 injected it at Q13 and I got almost 10w on dummy load (thanks Jerry/KE7ER!)

It seems the TX amp section (Q13-Q15) is working ok

Is the arduino's output at 40mVpp on LSB normal? and when I switch to USB i got no output

I already adjusted the output to 8mA for USB/LSB, is there any other way to increase the output? 

thanks and 73!
jonathan/DV2NAH

First BITX to BITX contact...

Keith VE7GDH
 

I heard Tom VE3THR calling CQ on 7277 KHz at about
02:45 UTC... 19:45 Pacific / 22:45 Eastern. I gave Tom
a shout with a 100W rig and made contact and then changed
over to my BITX40. While I have made perhaps a dozen or
so contacts with the radio before (San Diego 1900 km was
my best DX previously) and I have made contact with BITX
radios on the other end a couple of times, this was my
very first BITX to BITX contact!

Needless to say, I was quite excited with this 3473 km
QSO. I was copying Tom quite easily most of time and gave
him a 3x3, but going by the 2x2 that he gave me and the
number of times I gave my call sign before making it a
confirmed contact, I don't think he was copying me as
well as I was copying him. I don't think we could have
exchanged much than the signal reports and call signs,
but VE3THR is in the log!

Thanks Tom for being my first BITX to BITX contact!

--
73 Keith VE7GDH
CN88

Re: BITX QSO Night, Sunday, August 20, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere

RCC WB5YYM
 

Tom, you were 59 here. I could not hear Keith but I heard you give him the report. 

Re: BITX QSO Night, Sunday, August 20, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Tom VE3THR
 

wow, just did a 2000 mile qso with ve7gdh Keith on bitx40...BARRIE ON to SALT SPRING ISLAND, BC. That's a record distance for my bitx40. Sigs were only 2x2 but we did it.

Rotary Encoder - Nut size?

John P
 

I bought a bunch of the KY-040 encoders on eBay a couple of weeks ago, but they didn't come with the nuts to attach them to the panel of anything. Anybody know what size nuts they need. Battery died in my caliper tonight, so I can't even measure the diameter! TIA!
--
John - WA2FZW

Re: BITX QSO Night, Sunday, August 20, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere

RCC WB5YYM
 

Ed, you were really strong here. Easily 59. Hate that I missed the contact. I have some fine tuning to do on the whole station. 

Re: BITX QSO Night, Sunday, August 20, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Larry Smith
 

QSO with Bill N2CQR S9+

QSO with W1LY Willy 59 as always with a bit of QSB

Heard VE!BW? QSO with N2CQR

73
WA9DOH  Larry

On Thu, Aug 17, 2017 at 7:58 PM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote:
BITX QSO Night, Sunday, August 20, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!

To participate, call CQ BITX at 7pm sharp, your local time, on Sunday. Repeat your CQ call on the quarter hour (every 15 minutes). It is helpful if you call CQ BITX with your name and location.  Repeat your call a number of times if conditions are weak.

This is a worldwide event starting at 7pm in each time zone. The band tends to improve as the night goes on, so please call CQ and monitor through the evening. 

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.  The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls at 7pm on Sunday.  Talk to you then!