Subj : Conversion up or down?
To   : Richard Menedetter
From : Holger Granholm
Date : Fri Sep 02 2016 09:41 am

In a message on Friday 09-01-16 Richard Menedetter said to Holger
Granholm:

Good day Richard,

RM> An Upconverter is needed to convert a lower frequency signal to a
RM> higher frequency signal.

OTOH, a downconverter is needed if I want to use my FT-290 VHF (144 MHz)
transceiver to send on the HF (SW) bands. That is what my 'Tokyo HI-Power
VHF>>HF Transverter' does.

IOW, converting the 144 MHz signal to for example 14 MHz.

RM> See also the descritpion for the Ham-it-up upconverter:

RM> It seems that the convention is the other way around.

You are actually converting down the receiving frequency band to be able
to receive frequencies below the 25-1300 MHz band, that the thumb-stick
is designed to receive.

Yes it seems that the Ham-it-up that you are referring to, has got the
convention on the back foot.

In all my life as a HF-VHF-UHF-SHF ham, I have built converters to be
able to receive VUSHF, on for ex. 28 MHz.

That is downconverting, ie. converting the 144 MHz signals to 28 MHz.

When I wanted to use my Drake TR-4 transceiver to transmit on 144 MHz,
I needed an upconverter.

So, finally it all depends upon from which viewpoint you look at it.


Regards,

Holger

---
 þ MR/2 2.30 þ And on the 8th day God said, "OK Murphy, you take over"
 * Origin: Coming to you from the Sunny Aland Islands. (2:20/228)

.