# nm-spectrum-monitor

## RF Front End Diagram (Interconnecting cables not shown)

+--------------------------------------------+
|Electro-Metrics EM-6857 (Antenna)           |
+--------------------------------------------+
|                                            |
+--------------------------------------------+
|FRONT END                                   |
+--------------------------------------------+
|Dynatech Microwave M4-413K201L (SP4T Switch)|
+--------------------------------------------+
|Mini-Circuits PMA3-14LN+ (LNA)              |
+--------------------------------------------+
|Mini-Circuits PMA3-14LN+ (LNA)              |
+--------------------------------------------+
|Dynatech Microwave M4-413K201L (SP4T Switch)|
+--------------------------------------------+
|                                            |
+--------------------------------------------+
|75 ft Andrews LDF1-50 (Heliax)              |
+--------------------------------------------+
|                                            |
+--------------------------------------------+
|BASE                                        |
+--------------------------------------------+
|Mini-Circuits ZFRSC-123-S+ (Splitter)       |
+--------------------------------------------+
|Keysight N9040B (SA)                        |
+--------------------------------------------+

## Changelog

### 3-27-2026, 2:42 MT

- Added Mini-Circuits ZFRSC-123-S+ splitter to do dual monitor with two spectrum analyzers, nominal insertion loss is ~9.6 dB in the operating frequency.