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Good filters needed on 3.4GHz
Posted: Sun Nov 27, 2022 2:20 pm
by g8gtz
Vodafone now using the spectrum from 3410 MHz up which they bought for 5G and Graham G3VKV in Cheltenham posted this picture on the UKmicrowave io group.
- 3.4GHz.jpg (58.09 KiB) Viewed 12056 times
As you can see this is right next door to the 3400 - 3410 MHz amateur allocation and so anyone planning 9cms operation will need very good filtering both on transmit and receive....
73
Noel - G8GTZ
Re: Good filters needed on 3.4GHz
Posted: Sun Nov 27, 2022 3:59 pm
by radiogareth
No wonder receiving GB3JV (3.404GHz) was so problematic with all that stuff nearby.
I wonder it the old Ionica TX filters can be persuaded to tolerate 50W from a Toshiba amp? The RX path can be catered for with a pipe-cap or two, or maybe an interdigital?
Something to discuss on Tuesdays HV show....
Gareth
Re: Good filters needed on 3.4GHz
Posted: Sun Nov 27, 2022 4:21 pm
by Graham_J_G3VKV
I use one of the filters from an Airspan/Stealth 9cms PA unit
the band is unusable here without it
Graham G3VKV
Re: Good filters needed on 3.4GHz
Posted: Sun Nov 27, 2022 10:21 pm
by g0mjw
Those are good filters and designed to handle the TX power, typically 20W. They can be re-tuned, so I would suggest using one of those. You only need it for receive but it is a good idea to keep your signal clean on transmit too.
Mike