ZL3RC > 14-12-2022, 06:00 AM
VK5WRJ > 14-12-2022, 08:04 AM
(14-12-2022, 06:00 AM)ZL3RC Wrote: I found a VK3XDK 432 transverter in a box of bits I was given recently and searching on the web didn't retune anything useful.Have you tried contacting VK3XDK for information? still a valid Victorian call sign.
This is the board Im talking about and as you can see its had a SMD switch pre-soldered and also has the mixer taped to the board.
Looks like it may have been a kit of some sort but any information would be great.
73
Roger ZL3RC
VK4ADC > 14-12-2022, 10:43 AM
VK2AZ > 14-12-2022, 01:18 PM
VK4VU > 30-12-2022, 07:34 PM
ZL3RC > 31-12-2022, 03:54 PM
(30-12-2022, 07:34 PM)VK4VU Wrote: Hi Roger,
I gather that you originally posted a picture of the board that you have.
My recollection is that the earlier version had etched striplines for the BPF, whereas the later version used a helical filter. I have built both of these, but for the moment have attached some information on the stripline BPF version.
I know Graham was a big fan of the SNA586 MMIC so I feel sure that device would have been used in the Tx amplifier.
Can you please confirm which version you have ?
73
Rod VK4VU
VK4ADC > 31-12-2022, 07:09 PM
ZL3RC > 31-12-2022, 07:31 PM
(31-12-2022, 07:09 PM)VK4ADC Wrote: RogerThanks Doug and all understood.
Refer post #3 above for LO level and stage gain determination, however one of the MMICs in each path was replaced by a capacitor on that board layout so use 0dB gain/loss for that stage.
There are better products now-adays (and available) than the SNA586 and because they are all based on 50 ohm in/out, changing to a more modern MMIC in the same package style is as simple as changing the series bias resistor to the output pin of the MMIC.
Have fun. HNY
Doug
VK4VU > 01-01-2023, 04:08 PM