Difference between revisions of "Output Attenuator"
(Created page with "===Introduction=== It is possible to add a programmable output level attenuator to the Portsdown transmitter. As of software version 201801061, the output attenuator can be...") |
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===Attenuator Types=== | ===Attenuator Types=== | ||
| − | Attenuators based on the PE4302, HMC1119 or PE43703 (preferred) are supported. The PE4302 and PE43703 types are readily available on eBay for under £20. The preferred type is the | + | Attenuators based on the PE4302, HMC1119 or PE43703 (preferred) are supported. The PE4302 and PE43703 types are readily available on eBay for under £20. The preferred type is the PE43703 illustrated here: |
| − | [[File: | + | [[File:PE43703 post-mod small.jpg|480px]] |
| − | Data sheets are available at these links: | + | Data sheets are available at these links: http://www.psemi.com/pdf/datasheets/pe4302ds.pdf http://www.psemi.com/pdf/datasheets/pe43703ds.pdf http://www.analog.com/media/en/technical-documentation/data-sheets/HMC1119.pdf. |
| + | |||
| + | ===Preparation=== | ||
| + | |||
| + | As supplied, the eBay pre-built attenuator boards are generally configured for control by DIP switches, not by a Raspberry Pi. '''NOTE THAT IF CONNECTED WITHOUT MODIFICATION THEY MAY KILL YOUR RASPBERRY PI!''' The modification details for the PE43703 are details here. Please could a PE4302 owner publish similar information?? | ||
| + | |||
| + | There are 3 signal lines used to program the PE43703: LE (Latch Enable), CLK (Clock) and Data. For DIP switch programming the LE line is connected to +5v. This line needs to be disconnected from +5v and connected to the external programming pin. Referring to the picture below (pre-modification) | ||
| + | |||
| + | [[File:PE43703 pre-mod small.jpg|480px]] | ||
Revision as of 13:42, 12 January 2018
Introduction
It is possible to add a programmable output level attenuator to the Portsdown transmitter. As of software version 201801061, the output attenuator can be used to adjust the output level of the Portsdown Signal Generator. It is planned that a future software version will allow programmable output levels to be set for each band (and possibly for additional transverter outputs).
Attenuator Types
Attenuators based on the PE4302, HMC1119 or PE43703 (preferred) are supported. The PE4302 and PE43703 types are readily available on eBay for under £20. The preferred type is the PE43703 illustrated here:
Data sheets are available at these links: http://www.psemi.com/pdf/datasheets/pe4302ds.pdf http://www.psemi.com/pdf/datasheets/pe43703ds.pdf http://www.analog.com/media/en/technical-documentation/data-sheets/HMC1119.pdf.
Preparation
As supplied, the eBay pre-built attenuator boards are generally configured for control by DIP switches, not by a Raspberry Pi. NOTE THAT IF CONNECTED WITHOUT MODIFICATION THEY MAY KILL YOUR RASPBERRY PI! The modification details for the PE43703 are details here. Please could a PE4302 owner publish similar information??
There are 3 signal lines used to program the PE43703: LE (Latch Enable), CLK (Clock) and Data. For DIP switch programming the LE line is connected to +5v. This line needs to be disconnected from +5v and connected to the external programming pin. Referring to the picture below (pre-modification)
