Úprava Yaesu FT-817 na zníženie spotreby pri príjme : The FT-817 also consumes quite a lot during reception, according to the manual it is approx. 250mA with the RX silencer closed and approx. 450mA with the silencer open, which is quite a lot, and according to my experience, the TRX can only last for approx. 6 hours during reception and not even approx. 15 minutes of broadcasting on the internal 1400mAh battery. Therefore, even a minimal reduction in consumption will help. I found one description on the Internet. The LED on the front panel indicates an open silencer in green and transmission in red. Income is also indicated on LCD displeji S-metrom a tak sa dá ušetriť na LED, keď odpojíme napájací rezistor od LED diódy, aby pri príjme pri otvorenom umlčovači nesvietila, ušetrí sa cca 12 až 15 mA pri príjme. Počas vysielania, pri stlačenom PTT zostane LED svietiť na červeno, ako to bolo aj pôvodne. Rozober TRX, odober predný panel, odpoj prepojovacie káble medzi predným panelom a telom TCVR. Stiahni gumu z gombíka, pod ňou je malá skrutka, ktorú povolíš imbusákom 1/16 INCH. Stiahni gombík, povoľ maticu, vytiahni VFO ladiaci člen. Vytiahni gombík SEL. Odskrutkuj skrutku pridŕžajúcu plošný spoj k plastovému prednému panelu. Opatrne vytiahni plošný spoj zo spodnej strany, tam kde nie sú dve biele západky.
The LED is located on the front of the circuit board above the hole for the VFO knob. It is a small plastic square with 4 outlets. Now find the two resistors just next to the LED on the left. Remove the resistor that is close to the VFO hole, not the one that is close to the top edge.
Carefully reassemble the entire TCVR. When you turn on the radio and open the silencer the LED should not be green, when broadcasting the LED should be red, just like before.
However, in my opinion, the entire modification will not bring such a significant effect on the overall reduction of consumption and the extension of the TRX's battery usage time. Compared to the labor involved in disassembling the front panel and removing the resistor powering the LED, I wouldn't do it a second time...
Jozef, OM1CI, http://jbalaz.szm.com