Colin (VK4UV) and Stefan (VK4CDS) will give a presentation on building low cost Transverters for 10/24/47 GHz with low-cost benefits ease of build. See us on the April 2026 Meeting.
10MHz OCXO
Maybe an outlay of $100/150 plus, depending on your spares box.
rev 1-12 See below for dimensions
Tuned to 5112 MHz x2 (144.00MHzIF) or 4968 MHz x 2 (432 MHz IF)
EVANESCENT MODE WAVEGUIDE FILTER dimensions to follow. SEE HERE for more info also here
RASPBERRY PI P2040 using the fantastic software from G4EML See HERE
then a simple (Dual) BAT-15-04W or 2 BAT15-03w in parallel
BAT 15-04W Data sheet hereAnd a PTT change over relay arrangement will be required like this also above. Thanks to VK4KYT (Luke) found this on relay. Also here: RF/ Attenuater Soldered to an SMA then fit the SMA into an old Foxtel LNB using that as a simple horn antenna Now this system on 10Ghz might do 50Klm hilltop to hilltop using 600mm dishes (confirmed 85Klm on 3/5/2026VK4UV/CDS) but it is a cheap way
Probe Length 12/15mm 3 required.
MAX2870 requires a capacitor(102) and an inductor be removed from PC Board “ONLY USE THIS ” this must be programmed to 5112MHz x2 (144.00MHzIF) 4968 MHz x 2 (432 MHz IF). Read the G4EML programming of this device on his site.max2870 with components marked in red to remove.
Block diagram ( .5 watt/3dbm drive)
relay see above schematic
max2870
closeup of pot/ bead (not essential), Its important to solder BAT15-4w at the feed horn, diode on probe inside horn.
evanscent wire hold wire with copper tape to inside tube.
Diode solded to pin and base
MAX2870 PLL LO 5112 MHz(144MHz)IF 4968MHz(432MHz)IF
Next Meeting CLUB M A D 26th August lots of Club members are booked in." Guest Speaker Hayden VK7HH" Wednesday 23rd September 2026 Chermside Library Confirmed/Teams Donate your CANS/Bottles to Our Club. Please contact Maxine for TEAMS entry Information . VK4RTT QRP 144.440MHz and 50.285MHz, modes - CW, OOW , PI4, Q65. from QG62LM for testing.
