FT-847 on 70 Mhz

By G7CNF

This article presents a technical investigation into spurious emissions from the Yaesu FT-847 transceiver when operating on the 70MHz (4-meter) band. The author discovered significant problems with both factory UK spec and modified units. Spectrum analysis revealed that when transmitting at 70.2MHz, the radio produces numerous spurious signals, with the most prominent emission at 45.6MHz measuring only 3dB below the fundamental frequency. The study also documents poor power efficiency on 4m (10.3% at 30W output) compared to 6m operation (23.5% at 30W). Tests verified that jumper configurations had no effect on filter selection. The author warns that using these radios on 4m may violate license conditions due to excessive spurious emissions.

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Radio Equipment/HF Transceivers/Yaesu FT-847

The title of the main category is Yaesu FT-847 and it deals mainly with Yaesu FT-847 links. The link to this resource has been on our site since Thursday Apr 26 2007, and it has been followed 1786 times. So far it received 1 votes for a total score of 8.00/10
Last updated: 2025-04-11

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