Hi? Ian

I have a spare MK2 board that i can supply you at postal charges. If you send your address to mm0kos@... ill pop it in the post today for you.

Regards Chris MM0KOS

Adrian,

? ? ? ? ? ? How much do you want for the board? Is it an original board by Andy or is it something elde someone has created? If it is has it been built and working using that pcb design?? Postage would be to USA.

Thanks. Ian K3HQL

On Monday, December 21, 2020, 03:11:03 PM CST, Adrian Rees (M1LCR) <rees.a@...> wrote:

Take a look in the Irwell Folder in the G6LBQ Forum.

Adrian M1LCR

On 21/12/2020 18:26, Trent Trent wrote:

Where do ya get the circuit diagram from for the amp

On Tue, 22 Dec 2020, 3:27 am Adrian Rees (M1LCR), <rees.a@...> wrote:

I have a Mk3 PCB spare if that helps ?

Adrian M1LCR

On 21/12/2020 14:37, Ian Gerard via wrote:

Anyone have a Mk2 Linear amp PCB they would be willing to sell?

Where do ya get the circuit diagram from for the amp

On Tue, 22 Dec 2020, 3:27 am Adrian Rees (M1LCR), <rees.a@...> wrote:

I have a Mk3 PCB spare if that helps ?

Adrian M1LCR

On 21/12/2020 14:37, Ian Gerard via wrote:

Anyone have a Mk2 Linear amp PCB they would be willing to sell?

Where do ya get the circuit diagram from for the amp

On Tue, 22 Dec 2020, 3:27 am Adrian Rees (M1LCR), <rees.a@...> wrote:

I have a Mk3 PCB spare if that helps ?

Adrian M1LCR

On 21/12/2020 14:37, Ian Gerard via wrote:

Anyone have a Mk2 Linear amp PCB they would be willing to sell?

Anyone have a Mk2 Linear amp PCB they would be willing to sell?

------ Original Message ------
From: "Adrian Rees (M1LCR)" <rees.a@...>
To: [email protected]
Sent: Thursday, 11 Jun, 2020 At 16:14
Subject: Re: [G6LBQ] VFO Frequency offset

Hello Gordon

I have had some difficulties wit the VFO for the G6LBQ.

You can enter the VFO management mode. The specific doc you need is likley in the files section. However, if it is not, I have copied it below.

This is for the Ver 4.2 Firmware.

Top tips: Once you have set the VFO Off set, ( likley 11.0592 MHz if you are using Xtals supplied by Andy) you will need to calibrate the SILabs chip.

The instructions in the doc (and below) are difficult to understand, so here's what you do:

1. Disconnect your VFO from the main board and connect its output to a frequency counter that you know to be accurate.

2. Check you have the VFO Offset you wish to use, set up correctly in the VFO.

3. Power off the VFO, power on and write down the displayed frequency.

3. Enter the menus system and navigate to calibrate.

4. Adjust the VFO such that the displayed frequency on your accurate counter (step 1) equals the frequency you wrote down in step 3, by adjusting the tuning knob. This may take quite a lot of turning.,,,,,,

5. Once done, save & exit the menus system.

Note that there is a known "bug" in the software, well, known to me that is, it exhibits it self as a the radio being slightly off frequency more and more as you go higher in frequency. This is due to the mathematics used in the VFO to manage the SiLabs chip and inaccuracy in the chip itself. Its not much, but I found around 3 or 4KHz at 29MHz.

Hope that helps.

Adrian M1LCR

G6LBQ – Si570 Digital VFO Kit
Firmware Under Licence From PA0KLT
Last edited 25th May 2013
Operating instructions G6LBQ – Si570 VFO - V4.20 firmware
Seven push Buttons and the Rotary Tuning control are used to operate the VFO
These are:
? Cursor <
? Cursor >
? Escape ESC
? Memory MEM
? RIT (Receiver Incremental Tuning)
? CLEAR
? LOCK
? TUNING (Rotary Encoder with switch used for fast tuning)
There are four modes of Operation
These are:
? VFO A (VFO A frequency - Manual tuning - Frequency Recal and Store)
? VFO B (VFO B frequency - Manual tuning - Frequency Recal and Store)
? Memory A (16 Memory Locations 1 - 16 to Recall or Store Frequencies)
? Memory B (16 Memory Locations 1 - 16 to Recall or Store Frequencies)
A Short push on "MEM" button switches between these four modes
VFO Mode A or VFO Mode B
? The Tuning speed - Frequency step is adjusted with < and >CURSOR keys. The
frequency step can be set from 1 Hz, 10 Hz, 100 Hz, 1 kHz etc up to 100 Mhz. The push
button on the Rotary encoder activates a fast tune option by increasing the encoder
resolution by X25.
? One press on the RIT button enables RIT (Receiver Incremental Tuning) and a second press
disables the RIT function. The total tuning range of RIT is +/- 10kHz. A press on the
CLEAR button resets the RIT frequency offset back to 0 kHz.
Page 1 continued on next page
? While in VFO Mode Pressing the ESC button sets all the digits right of the curser to zero
? To store the displayed frequency in VFO mode to EEPROM, the MEM key is pressed for 2
seconds until the LCD displays STORED
? Tuning to a frequency and pressing the MEM button for two seconds stores that frequency
ready for the next time the unit is switched on. When in VFO use, pressing MEM is only to
store the last frequency used in EEPROM. Setting that frequency does not store it in any of
the 16 Memory locations.
Memory Mode
? Use a single quick press of the MEM button selects Memory A or Memory B.
? When in Memory A or Memory B mode, press < > cursor buttons to select the required
memory location (1 - 16). The previously stored frequency in the selected memory location
is now displayed.
? When in the selected Memory location press the ESC button to turn on Manual memory
tuning and tune to the frequency you want to memorise (store)
? When at the desired frequency press the MEM Button for 2 seconds to store that frequency
? Press ESC sets all the digits right of the cursor to zero
Synthesizer Configuration Mode
The configuration menu's are accessed as follows:
? Press CURSOR < and > keys together for about 2 seconds until the configuration menu
appears, release CURSOR keys and use CURSOR buttons < or > to select Configuration
Options as described below. Store your selection by pressing the MEM key.
Intermediate Frequency (IF) Offset Mode:
? Press MEM momentarily. Select the desired (IF Offset) using CURSOR buttons and Rotary
encoder. The offset can only be a positive frequency so Si570 output (Local Osc) is higher
than IF Frequency. Press MEM to store the offset. Press ESC to cancel.
By default the IF offset is set to 9mHz
Note 1. If an IF-Offset of less than <100 kHzis specified then the IF-offset will be
removed with a delay of 5mS if the Lock (PTT) is activated by grounding this line to earth.
Note 2. If an IF-Offset of less than <1 kHzis specified then the 5 mS delay will not be
applied (as is the case for FSK)
Page 2 continued on next page
Calibration mode:
? Press MEM momentarily. The Si570's internal reference frequency is now displayed and
may be changed so that the SI570 output frequency measured on a counter is exactly as
displayed on the VFO LCD display. Once the corrected reference frequency has been
selected press the MEM for 2 seconds to store the new value.
Multiplier (Si570 output frequency = (Displayed Frequency * Multiplier)
? Press MEM momentarily and select the required multiplier factor: 2^0 for Multiplier 1,
2^1 for Multiplier 2, 2^2 for Multiplier = 4 and 2^3 for Multiplier = 8. Press MEM for 2
seconds to store.
This option should be left at its default setting for the G6LBQ multiband transceiver.
Default Configuration:
? If the configuration is corrupted for whatever reason the default configuration settings may
be loaded in EEPROM. Press MEM momentarily. Press MEM for 2 seconds to confirm or
ESC to cancel
Set Maximum Frequency for Si570:
? The Si570 chip supplied with the G6LBQ multi-band VFO kit is capable of operating up to
210MHz but this is not guaranteed. The upper frequency limit of the VFO can be pre-set as
desired. When choosing the maximum frequency the plus IF frequency must also be added
to the maximum wanted frequency. For example: the maximum frequency needed for the
G6LBQ multi-band transceiver is 30 MHz, this along with an IF frequency of 9 MHz
requires that we set the maximum frequency to 39 MHz. Press MEM briefly and set
maximum frequency using rotary control and CURSOR < > buttons. Press MEM for 2
seconds to store
or press ESC to cancel.
Minimum frequency for Si570:
? The minimum frequency which is supported by the Si570 and the firmware is 3.50 MHz but
IF Offset needs to be taken into account. For Example if IF Offset = 9 MHz and lowest
frequency required was 1.8 MHz then the minimum frequency should be set to: (1.8+9) =
10.8 MHz
Configuring I2C address for the Si570:
? This option allows you to select the correct I2C address for the AVR chip to
communicate with the Si570 chip. Si570 chips supplied by DX KIts have address HEX 55.
Si570's from other suppliers may use a different address (for example HEX 50). The
firmware allows you to specify any I2C address between Hex 50 and Hex 5F. The default is
Hex 55.
Page 3 continued on next page
Si570/Si571 Selection:
? The firmware supports the Si570 & Si571 chips though DX Kits only supply the Si570.
Selection of this option allows changes to be made to the value for Kv. The default setting
for the Si570 is 0. If a Si571 chip is fitted then Kv should be set to a starting value of 180.
Press MEM momentarily to access the Si570/Si571 selection. After Kv value has been set
press MEM to store the new value or press ESC to quit this option.
END:
? When you have finished in the configuration mode return to VFO mode with a single press
to the ESC button.
Complete Power-up Reset
On rare occasions the EEPROM data may become corrupted which could prevent the VFO from
initializing properly and operating. Erasing EEPROM and applying the default Configuration is not
possible and a Power-up Reset may be necessary as follows:
? Press ESC and MEM buttons at same time and apply DC Power until the LCD Screen
shows the normal start-up screen. Release ESC and Mem buttons. Any configuration
information previously applied will be lost and need to be re-applied.
Page 4 End of manual

On 11/06/2020 11:49, Gordon Bowhay via groups.io wrote:

Hi, i need some advice on the G6LBQ digital VFO. The firmware version is 4.2. I recently built this after having the components in a drawer for some years. The Xtals in the exciter are 11 MHz and so I want to put this in as the offset which I can do. Then the highest frequency which I can extract from the synthesizer is 27.9MHz.If I remove the IF offset I can only tune up to 39MHz. It would appear that the firmware was intended to match an exciter with a 9 MHz Xtal filter. Is there a way around this problem? What is preventing a higher frequency from being extracted? Thanks in anticipation.
Gordon

Hi, i need some advice on the G6LBQ digital VFO. The firmware version is 4.2. I recently built this after having the components in a drawer for some years. The Xtals in the exciter are 11 MHz and so I want to put this in as the offset which I can do. Then the highest frequency which I can extract from the synthesizer is 27.9MHz.If I remove the IF offset I can only tune up to 39MHz. It would appear that the firmware was intended to match an exciter with a 9 MHz Xtal filter. Is there a way around this problem? What is preventing a higher frequency from being extracted? Thanks in anticipation.
Gordon

Hi all

Apologies if this isn't the correct forum...

I have a CDG2000 transceiver "kit" for sale.

(The CDG2000 was a very high performance transceiver documented in RadCom a number of years ago. It featured H-mode mixers and a receive chain that challenged the best of commercial receivers performance).

I am selling a set of printed circuit boards, screening boxes and the majority of components (pretty much all of the components needed to build the transceiver, but including all of the hard to find components. You? need to add a VFO & display).

All documentation will be included.

?100 plus postage & packing.

73

Adrian M1LCR