Transverter range

VK4BXI
Posts: 17
Joined: Sat May 22, 2021 11:44 am
Location: Brisbane

Transverter range

Postby VK4BXI » Thu Nov 18, 2021 6:37 am

Hi all,
in Australia I find the top end of 70cm is at 440 MHz (local repeater at 439.975) I am wondering the best way to get coverage given the nominal IF range of 28 - 32 MHz . Will the 7000 mk2 stretch above 32MHz ? a LO of 404MHz will give me 432MHz to 436 MHZ nominal. Would the best be to try for a unit that has two LO frequencys of (say) 404 and 408 MHz ?
I gave up my Flex 5000A with its 2/70 capabilities and would like to get to something similar with my 7000. But at the moment there doesn't seem to be a simple way of getting there.

Bob
User avatar
w-u-2-o
Posts: 3362
Joined: Fri Mar 10, 2017 1:47 pm

Re: Transverter range

Postby w-u-2-o » Fri Nov 19, 2021 3:25 pm

I was hoping someone with transverter experience would chime in, because that would definitely not be me!

However, since nobody is posting, I'll make a suggestion: assuming the transverter allows it, there is no reason to restrict your operations to the range of 28-32MHz. Any Apache labs hardware will operate continuously from well south of 1MHz to just about 60MHz. To enable operations outside of standard band limits the "extended" region option in Setup > General > H/W Select can be used in Thetis. This option exists for many valid and legal reasons, such as this case, MARS operations, to use the radio as a test instrument, etc.
VK4BXI
Posts: 17
Joined: Sat May 22, 2021 11:44 am
Location: Brisbane

Re: Transverter range

Postby VK4BXI » Wed Nov 24, 2021 6:43 am

Ok I've answered my own question.

I set up transverters in the setup table for 2M and 70CM. I then did some injection of 28 to 40 MHz into the transverter input and checked what happened when on the transverter bands.

Basically as you go through the band the providing you have setup the top limit frequency on the transverter correctly and the "Lo" oscillator is defined correctly you can keep going all the way up. So I set the Lo on the 70CM to be 404MHz. And the minimum frequency to be 432MHz and the maximum frequency to be 440 MHz. As I tuned the signal generator from 28 MHz up to 36MHz the signal appeared to move from 432MHz through to 440MHz. Thats all fine and perfect. I did note that the various HF low pass and band pass filters correctly switched in and out as I went through from 28 to 36 MHz so that all seems to work. I did have a few hassles getting things to work and saving the TX profile and switching on and off a couple of times fixed that.

So as noted by WU2O the transverter range appears to be anthing you want it to be as long as its somewhere in the HF bands I.E. 1 - 60 MHz.

Bob

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