Well,
Following the success of my 2M transverter project back here:
http://g0mgx.blogspot.co.uk/2014/10/transverting-some-more-some-more.html
which I showed off working here:
http://g0mgx.blogspot.co.uk/2015/03/ts-990-on-2m-144mhz-no-way.html
I decided that I would like to have a bash at making one of these transverters for 4M. Sam, G4DDK agreed to supply me with a kit of parts for a 4M variant of the Anglian. There are about 40 or so component changes. This meant that the board needed the SMD soldering to complete the unit - the 2M version required no SMD soldering!
So here is the project in it's infancy:
And here with quite a few more components in place:
and here with it complete and in the tin screening box:
I've run all the basic tests and both the RX converter and TX converter are working fine. There is a 42MHz local oscillator (70 - 42 = 28) - as with the 2M variant, I have ordered a ZLPLL board from here:
http://zl2bkc.com/projects/zlpll/
to provide an external frequency reference to stabilise the on board LO.
I've started the PA board to go with the unit; it should deliver about 7W output.
I've decided that to avoid any switching between transverters I will leave the 2M box interfaced to the TS-990 and use this 4M variant with the FT-DX5000. That has a transverter output which is -10dBm rather than the 0dBm I require. I may have to experiment a little with the levels but I should be able to drive the 4M Gemini amplifier perfectly with this combination.
Let's see.
Freddy cat has been doing a fine job of being almost completely in the way throughout.
Local conditions.
Following the success of my 2M transverter project back here:
http://g0mgx.blogspot.co.uk/2014/10/transverting-some-more-some-more.html
which I showed off working here:
http://g0mgx.blogspot.co.uk/2015/03/ts-990-on-2m-144mhz-no-way.html
I decided that I would like to have a bash at making one of these transverters for 4M. Sam, G4DDK agreed to supply me with a kit of parts for a 4M variant of the Anglian. There are about 40 or so component changes. This meant that the board needed the SMD soldering to complete the unit - the 2M version required no SMD soldering!
So here is the project in it's infancy:
And here with quite a few more components in place:
and here with it complete and in the tin screening box:
I've run all the basic tests and both the RX converter and TX converter are working fine. There is a 42MHz local oscillator (70 - 42 = 28) - as with the 2M variant, I have ordered a ZLPLL board from here:
http://zl2bkc.com/projects/zlpll/
to provide an external frequency reference to stabilise the on board LO.
I've started the PA board to go with the unit; it should deliver about 7W output.
I've decided that to avoid any switching between transverters I will leave the 2M box interfaced to the TS-990 and use this 4M variant with the FT-DX5000. That has a transverter output which is -10dBm rather than the 0dBm I require. I may have to experiment a little with the levels but I should be able to drive the 4M Gemini amplifier perfectly with this combination.
Let's see.
Freddy cat has been doing a fine job of being almost completely in the way throughout.
Local conditions.
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