i use a Pluto to work over the QO100 bird.
The Langstone TRX is a fine possebillity to work on different Microwave Bands with one TRX.
I think an important thing is to switch the transmit and receive signal from the Pluto to the corresponding preamplifier or amplifier.
Is there anything that you can switch the Pluto to 5-6 outputs?
It must work from 70MHz to 5800MHz, with as little loss as possible.
73 Tommi DL5BCA
The Langstone uses the same GPIO pinout so you can use the Portsdown 8 way RF switch up to 3GHz or some people are uses a Teledyne 6 way SMA relay which can be driven off similar logic.
https://wiki.batc.org.uk/Portsdown2019_ ... put_Switch
Noel - G8GTZ
https://i.ebayimg.com/thumbs/images/g/L ... -l225.webp
One way to overcome the high cost of new pukka RF SMA relays is to use PCB relays. You can and I have tried a cascade chain of 1->2 makes a decent 4 way switch and adding extra relays gives more outputs but the losses can be high, especially on FR4. That might not matter though if some additional gain stages were included, it's low power. We are not after ultimate isolation, just separating the various bands and there are tricks you use to minimise the number of stages used on higher bands at the expense of the lower ones where it's less critical.
The AXICOM relays might be a good choice https://www.digikey.co.uk/products/en?FV=-5|6210 Digikey part number PB1103CT-ND is a SPST RF relay rated to 3 GHz for £15. It will probably work at 6 GHz for this application. Part no Z6091CT-ND is a G6K RF rated relay DPDT also rated to 3 GHz and could switch and costs £20. Whatever, but with several relays required the surplus 6 way SMA relays are going to start to look like better value. It's a pity the switching ICs seem so poor and fragile.
A simple RF switch plus filters PCB could be designed and acquired from the usual Chinese PCB manufacturers. Probably good enough if you use the 0.8mm board and pay attention to layout.
They also make a HF6 type with a 6GHz spec. That appears to be the same relay but encased in a metal jacket.
On the RX side, 6 individual modamps and a 6 way resistive combiner. Power to the modamps switched per band. Resistive splitters have very little isolation but an off modamp has at least 10 dB loss and and on one 16-20 dB gain so all combined should give over 30 dB of isolation for not a lot of money.
edit - I guess if you only want to go to 13cms https://www.amazon.co.uk/Satellites-Sat ... B077DP3T28 is an 8 way splitter for £7 covering 5MHz to 2.7 GHz. You have to deal with F-connectors though. Maybe separate out 9cm and 6cm on a separate path (diplexer/relay).