开云体育

Hi Andy,

Have added myself for 2 exciters. I noticed on the databases pages that although I clicked on the second database for exciters the headings refer to band pass filters, likely a cut n paste error I presume.

As to the low pass filter PCB's I would prefer the dual purpose board. Well perhaps one of each.

I would also like a couple of PA boards if they are available.

Many thanks for picking this up again. Very much appreciated.

73

Martin, HS0ZED

Hi Everyone

Just a quick note to let you all know that I will be adding more databases soon so you can register your interest to pre-order Low-Pass Filter PCB's and HF Linear Amplifier PCB's.

When I originally designed the MK2 Low-Pass Filter module I wanted it to be universal so I created a PCB that could be populated with component options that rated it for low power use 10-20 Watts, or high power use 100 Watts plus. ?I am going to re-design the low-pass filter PCB for 10-20 Watt rating only, this will allow me to reduce the PCB size, use smaller relays and reduce the overall build cost. The new Low-Pass filter will become the MK3 and will also be used in the Irwell transceiver project currently under development.

I do have a small quantity of the MK3 HF Linear Amplifier PCB's in stock, this amplifier was developed to interface with the MK2 Exciter and take care of all the RF switching paths but is also a great universal HF Linear Amp for use with other projects including the Irwell Transceiver that is under development.

Stay tuned for more information and announcements!

Regards

Andy de G6LBQ?

Hi Everyone

The database for MK2 BPF PCB pre-order has gone better than I anticipated so thanks to those who have made use of the database and registered their interest.

I now need to get a price for having the boards manufactured and will do that very soon then contact all members via email with price confirmation.

Kind regards

Andy de G6LBQ

Hi Everyone

The database for pre-order of the G6LBQ MK2 Band-Pass Filter PCB has proven to be a success so I have now created a further database for registering interest to pre-order the Mk2 Exciter PCB

The database list is accessible to all members of the group so you can keep an eye on the level of interest registered.

I will need a minimum of 10 confirmed orders for PCB’s before I can place a manufacturing order.

All members who have registered there interest on the database will be contacted by email once there is sufficient interest to consider placing a manufacturing order for the PCB’s. In the email, I will confirm the PCB cost, shipping costs and you will have the opportunity to confirm your order.

Please note that any member you registers there interest on the database can remove themselves from the list should they wish to do so.

Access to the Group Databases is via the feature list on the left hand side of your screen between the files section and Wiki section.

Once you are in the Databases section you will see the heading Request for G6LBQ MK2 BandPass Filter PCB?? click on this to view the database.

If you want to add yourself to the database and register your interest just click the green button that says “+Add Row”

Next fill in the two required fields and finish off by clicking the blue button that says “+Save Row”

I have added myself to the database so you get an idea of how it appears.

?

Regards

Andy de G6LBQ

Hi Andy,

Very happy to know that the MK2 BPF PCB will be available soon.

I have already left my name on the database.

But I'm also interested in the full set of the MK2 PCBs, including the SSB exciter.

Will they be also available?

73

Paulo de PU1PBE

开云体育

Great stuff Andy, very encouraging. Already added for 2 boards.

Now, a full set of boards would really get me busy. How about the rest of them? :)

73

Martin, HS0ZED

Hi.. Can I get the updated schematic of G6LBQ's Multi band Bitx TRx

Thanks and regards

VU2RGQ

开云体育

Hi Everyone

It is great to see a good deal of interest in the MK2 BandPass filter PCB’s and In order that I can track the interest, I have created a simple database where users can register to pre-order.

The database list is accessible to all members of the group so you can keep an eye on the level of interest registered. I will need a minimum of 10 confirmed orders for PCB’s before I can place a manufacturing order.

All members who have registered there interest on the database will be contacted by email once there is sufficient interest to consider placing a manufacturing order for the PCB’s. In the email, I will confirm the PCB cost, shipping costs and you will have the opportunity to confirm your order.

Please note that any member you registers there interest on the database can remove themselves from the list should they wish to do so.

Groups.io has the power to permit database creation within the group so I have made use of this feature.

Access to the Group Databases is via the feature list on the left hand side of the Groups.io interface between the files section and Wiki section.

Once you are in the Databases section you will see the heading Request for G6LBQ MK2 BandPass Filter PCB?? click on this to view the database.

If you want to add yourself to the database and register your interest just click the green button that says “+Add Row”

Next fill in the two required fields and finish off by clicking the blue button that says “+Save Row”

I have added myself to the database so you get an idea of how it appears.

If all goes well and there are no burning issues with the database I will add additional databases so members can register their interested in the other transceiver PCB’s.

?

Regards

Andy de G6LBQ

Hello Andy,

I am also interested in MK2 PCBs.

Please count on me.

73, Marko, S54AM

开云体育

Andy,

Thanks a lot for the answer and patience.

I'm stiil waiting for most of the components arrive, to start building them.

Anyway, I'd like you to count on me for the MK2 boards set.

Regards,

73

Paulo de PU1PBE

Hi Paulo

The MK1 multi-band exciter was somewhat experimental so I never made it available as a kit. The PCB artwork for the MK1 was made freely available and some boards were manufactured and offered for sale but not by myself. Whilst the MK1 functioned it was not perfect for Multi-band operation so the MK2 was developed and improvements made.

The MK1 transmit amplifier stages were replicated from the classic BitX design but found not to be ideal for multi-band use. The final RF output from the exciter varied way to much across the bands and produced reduced power on the higher HF bands. I addressed this in the MK2 by increasing the bandwidth of the transmit stages and adding an additional stage of amplification to raise the exciter transmit output to around 350mw on all bands.

The xtal filter matching on the MK1 was not ideal especially on the MC1350 IF chip side. On the MK2 I made changes to the xtal filter with better impedance matching and improved filter bandwidth. The shape and bandwidth of the xtal filter was improved by increasing the number of xtals used in the filter to six.

On the MK1 the AGC proved difficult to tame in some builds so this was improved in the MK2 and easier to setup.

The MK2 has the addition of a front panel mount IF gain control.

The MK2 has an improved microphone pre-amp stage with additional audio filtering.

The MK1 used a common oscillator stage for both the USB and LSB carrier oscillators where as the MK2 has individual circuits for each oscillator.

There were some other small changes made in the MK2 but I have listed the main differences.

After the development of the MK2 multi-band exciter I re-designed the MK1 BPF from scratch and revised the MK1 lowpass filter module.

MK1 transceivers have been built and are in use around the world so do not be discouraged from building the MK1 if you have the boards. It is possible to include some of the MK2 upgrades into the MK1 for improvement.

If you decide to build the MK1 please share your progress with the group and if you have any further questions just ask!

Regards?

Andy de G6LBQ

?

Hello,

I am also interested to build one.

73
Uli
DF5SF

Hi Ian

I have uploaded the version 1.6 schematic to the files area and the following link should take you straight to it:

/g/G6LBQ/files/G6LBQ/Multiband%20SSB%20Exciter%20MK2/MK2%20Exciter%20Schematic%20R1.6.pdf

Thanks also for your kind comments.

Regards

Andy de G6LBQ

Hi Andy,

I'm a little (to tell the truth, a lot) confused about the BitX versions.

I recentely bought in eBay a set of pcb bare boards labeled MKI.

What are the differences between the MKI and MKII versions.

Are the set of boards completely different?

Where can I found the specific files for this versions?

Regards,

73

Paulo Borensztein

PU1PBE