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Farhan,

Really looking forward to building the uBITX and am in the process of gathering together all of the components.? Also going to go SMD as you did.? I have a few questions from studying your written description and the picture.

?

1.? ? ? ??1. ?The picture appears to show four relays and I only count three in the schematic.

2.?????? ?2. ?The picture appears to show seven crystals in the 12 MHz filter and the schematic shows eight.

3.?????? ?3. ?I can’t figure out the function of the P2 connection that comes off of the K3 relay, pin 12

?

I know I am probably missing obvious answers but just can’t figure it out.

?

Planning to use the K7QO “Muppet” pcb technique for construction, breaking the design into small modules (about 16 in all), and place them on a 6” x 6” so pcb as you did.? Going to go at it slow and test out each module as much as my knowledge and test equipment will allow.? I have the PHSNA (Poor Ham’s SNA) to check out the filters and will work on a way to test the amps.

?

Thank you so much for your design !

?

73,

Dale? K9NN

Dale,

I optimised the design further. Reducing the relays to just three. I added another cyrstal too as it really makes a difference. There should be a 4.7k resistor in series with the AGC diode too. I will update this in a few days. It has been hectic around here.

- f

On 19 Mar 2017 1:30 a.m., "dvhammer_99" <DaleHammer@...> wrote:

Farhan,

Really looking forward to building the uBITX and am in the process of gathering together all of the components.? Also going to go SMD as you did.? I have a few questions from studying your written description and the picture.

?

1.? ? ? ??1. ?The picture appears to show four relays and I only count three in the schematic.

2.?????? ?2. ?The picture appears to show seven crystals in the 12 MHz filter and the schematic shows eight.

3.?????? ?3. ?I can’t figure out the function of the P2 connection that comes off of the K3 relay, pin 12

?

I know I am probably missing obvious answers but just can’t figure it out.

?

Planning to use the K7QO “Muppet” pcb technique for construction, breaking the design into small modules (about 16 in all), and place them on a 6” x 6” so pcb as you did.? Going to go at it slow and test out each module as much as my knowledge and test equipment will allow.? I have the PHSNA (Poor Ham’s SNA) to check out the filters and will work on a way to test the amps.

?

Thank you so much for your design !

?

73,

Dale? K9NN

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.

This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.

The RD16HHF1 works well in the Ukranian transverter at 70MHz.

So perhaps you will remember these points and why not, 144MHz perhaps?

?

Irf530 would be better HF power and cheaper than the rd16 but a rf16vhf would b nice

On 21 Mar 2017 4:27 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.

This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.

The RD16HHF1 works well in the Ukranian transverter at 70MHz.

So perhaps you will remember these points and why not, 144MHz perhaps?

?

Irf530 would be better HF power and cheaper than the rd16 but a rf16vhf would b nice

On 21 Mar 2017 4:27 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.

This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.

The RD16HHF1 works well in the Ukranian transverter at 70MHz.

So perhaps you will remember these points and why not, 144MHz perhaps?

?

Here's a link to an article on how to avoid fake RD16HHF1's...

Rich

KC8MWG

On Monday, March 20, 2017 11:29 PM, Mvs Sarma <mvssarma@...> wrote:

members trying for RD16 on ebay are mostly landing at fakes. I had a lot of 10 (supposedly re printed stuff using IRF5** series.

?
After a long search i could find only one seller who sold genuine stuff on ebay. But he charges more.

?On the item description you clearly find that item is generic, or unbranded , or NEW.

?they are all fake

On Tue, Mar 21, 2017 at 5:00 AM, Trent Trent <vk7hrs@...> wrote:

Irf530 would be better HF power and cheaper than the rd16 but a rf16vhf would b nice

On 21 Mar 2017 4:27 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.

This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.

The RD16HHF1 works well in the Ukranian transverter at 70MHz.

So perhaps you will remember these points and why not, 144MHz perhaps?

?

--

Regards
Sarma
?

For VHF we use RD15...

On Mar 21, 2017 2:10 PM, "Richard Andrew Knack via Groups.Io" <ihc73scout2=yahoo.com@groups.io> wrote:

Here's a link to an article on how to avoid fake RD16HHF1's...

Rich

KC8MWG

On Monday, March 20, 2017 11:29 PM, Mvs Sarma <mvssarma@...> wrote:

members trying for RD16 on ebay are mostly landing at fakes. I had a lot of 10 (supposedly re printed stuff using IRF5** series.

?
After a long search i could find only one seller who sold genuine stuff on ebay. But he charges more.

?On the item description you clearly find that item is generic, or unbranded , or NEW.

?they are all fake

On Tue, Mar 21, 2017 at 5:00 AM, Trent Trent <vk7hrs@...> wrote:

Irf530 would be better HF power and cheaper than the rd16 but a rf16vhf would b nice

On 21 Mar 2017 4:27 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Easy enough to twist the gate and drain leads on the RD16HHF1 such that they fit into a board drilled out for the IRF510.? Maybe put a bit of heat shrink on them to ensure they don't touch where they cross over.? Allison reports the IRF510 works as well as the RD16* parts at HF through 50mhz, ?primary reasons to move to the RD16HHF1 is heat: ?avoids need for mica insulators at the heatsink, and gives better heat transfer from die to package tab.? Otherwise the IRF510 is an excellent choice for a minimum cost rig.? Good luck with hacking the uBitx PA to work smoothly from 160 through 2 meters, I'm fine with a good solid simple easy cheap 80/40/20 SSB/CW rig.

Jerry, KE7ER

On Mon, Mar 20, 2017 at 08:24 am, Lawrence Galea wrote:

I suggest that when you do the pcb design for the μBITX make pads for the PA so that people can either use the IRF510 or whatever you are going to finally use and an RD16HHF1 or RD16HVF1.

This would allow people to use the much sturdier RD if they want to and use only 12v for the supply and more so if they are going to use it up to 30MHz or even higher, perhaps on 50MHz and 70MHz with the RD higher efficiency.

The RD16HHF1 works well in the Ukranian transverter at 70MHz.

So perhaps you will remember these points and why not, 144MHz perhaps?

?

--

Regards
Sarma
?

Those output low-pass transmit filters are 50 ohms and symetrical.
You could just borrow a filter design from some other rig that's suitable for 50 Watts of power.
Should be one filter per ham band as is typical. (You can cheat on 60m, 30m, 17m, 12m)

There may be other issues with uBitx documentation.
For example, perhaps some of those resistors in the PA need to be moderately beefy.
You will need tools to sweep that crystal filter and adjust impedances and cap values to suit
your carefully matched crystals.? The bandpass filter at L1,2,3,4 will also need to be carefully tuned.
There is no software yet available for a Raduino to drive it.

But if none of that sounds daunting, go for it.

Jerry, KE7ER

?
On Wed, Oct 4, 2017 at 08:07 am, Jerry Gaffke wrote:

You don't want to just copy that uBitx schematic and expect it to work properly.
Still under development.