Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR, Power Genius, Tuner Genius and Antenna Genius Software?
SmartSDR v3.7.4 and the SmartSDR v3.7.4 Release Notes | SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
SmartSDR v1.12.1 and the SmartSDR v1.12.1 Release Notes
Power Genius XL Utility v3.8.8 and the Power Genius XL Release Notes v3.8.8
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
SmartSDR v3.7.4 and the SmartSDR v3.7.4 Release Notes | SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
SmartSDR v1.12.1 and the SmartSDR v1.12.1 Release Notes
Power Genius XL Utility v3.8.8 and the Power Genius XL Release Notes v3.8.8
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Bandwith and isolation of preselectors and ADC overload of 6700 for SO2R
Options
Kari Gustafsson SM0HRP
Member ✭✭
In my remote contest station I have a tower with a 3 el 40 m yagi (DIS 7-3) which is no more than 70 feet from aan other tower with 5 over 5 el 20/15 m stack (JK 2015). Unfortunately I discovered that the 3 el 40 has broad resonances at 16,6 and 22,5 MHZ (< 1.4:1) which couples strongly to 20 and 15 m bands of JK20/15 yagi. Of course putting in band pass filters and stubs could diminish these artifacts a 60 dB + 25 dB = 85 dB but still produce considerable signals into either 40 m or 20 m ham bands of the 6700.
I understand that the preselector add 20 db of isolation per ham band. How broad are these filters per ham band? How are the RX inputs (A and protected?
I have read about the ADC overload indicator with the protection relay- has this function been improved anyway?
I understand that the preselector add 20 db of isolation per ham band. How broad are these filters per ham band? How are the RX inputs (A and protected?
I have read about the ADC overload indicator with the protection relay- has this function been improved anyway?
0
Answers
-
Hi Kari You should be ok with the filters. I assume you are considering full duplex and SO2R operation. Here is the isolation sheet for calculating the isolation. http://www.flexradio.com/downloads/flex-6000-fdx-power-calculation-worksheet-pdf/ Low power filters between between the radio and amplifier are needed. High power if you are concerned about the level of harmonic content. Amplifiers contribute significantly to the harmonic content and you must consider this as well. Good luck 73, Craig K9CT0
-
Thanks Craig. It will be good advice along the road. I will be having both low power and high power filters to get some good isolation despite some extra half a dB of insertion loss. See you in the CQ WW 160 contest! GL.0
Leave a Comment
Categories
- All Categories
- 245 Community Topics
- 2.1K New Ideas
- 490 The Flea Market
- 7.4K Software
- 5.9K SmartSDR for Windows
- 135 SmartSDR for Maestro and M models
- 327 SmartSDR for Mac
- 243 SmartSDR for iOS
- 224 SmartSDR CAT
- 163 DAX
- 347 SmartSDR API
- 8.5K Radios and Accessories
- 6.9K FLEX-6000 Signature Series
- 767 Maestro
- 42 FlexControl
- 836 FLEX Series (Legacy) Radios
- 727 Genius Products
- 392 Power Genius XL Amplifier
- 251 Tuner Genius XL
- 84 Antenna Genius
- 222 Shack Infrastructure
- 149 Networking
- 370 Remote Operation (SmartLink)
- 118 Contesting
- 582 Peripherals & Station Integration
- 116 Amateur Radio Interests
- 811 Third-Party Software