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Title: Icom 7300 Tuner Post by: WA4WAX on January 27, 2018, 09:56:37 PM Question:
When the Icom 7300 tuner is off, does the set default to 50 + j0 at the jack? Thanks! Title: Re: Icom 7300 Tuner Post by: KB2WIG on January 27, 2018, 10:06:12 PM Most 'new' radios are designed to 'work' into a 50 ohm load.
http://www.icomamerica.com/en/products/amateur/hf/7300/specifications.aspx " General Frequency coverage RX TX 0.030–74.800** 1.800–1.999, 3.500–3.999, 5.255–5.405*, 7.000–7.300, 10.100–10.150, 14.000–14.350, 18.068–18.168, 21.000–21.450, 24.890–24.990, 28.000–29.700, 50.000–54.000 * Some frequency bands are not guaranteed. ** Guaranteed range: 0.500–29.999, 50.000–54.000MHz. Mode SSB, CW, RTTY, AM, FM Number of channels 101 (99 regular, 2 scan edges) @@@@@@@@@@@@@@@@@@ Antenna connector SO-239 (50Ù) @@@@@@@@@@@@ Power supply requirement 13.8V DC ±15% Power Consumption Tx: 21A (at 100W output power) Rx: 0.9A typical (Standby), 1.25A (Maximum audio) " I hope you're not asking, " If I had the radio tuner on, and tuned to a frequency, does the tuner default to the standard 50 ohm load if the tuner is tuned off? My Icom stuff stays tuned to where it was when the tuner is turned off. But I don't know for sure what the 3000 does. klc Title: Re: Icom 7300 Tuner Post by: KA2DZT on January 28, 2018, 01:28:28 AM Question: When the Icom 7300 tuner is off, does the set default to 50 + j0 at the jack? Thanks! I would think so, what else would possible happen? Title: Re: Icom 7300 Tuner Post by: w1vtp on January 31, 2018, 05:08:56 PM The source Z of all these rigs is 50 ohm +/- X furlongs per fortnights. ;D Which means you need to present a 50 ohm load no matter what. With the internal tuner turned on - all bets are off unless you present the same impedance to it as the last time you pressed the 'TUNE' button AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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