Sometimes on a low pass I will toggle between ISS RPa and ISS RPb since the affect of Doppler isn’t as pronounced on a low pass as it is on a more overhead pass. So at the beginning of the ISS pass, I start out on the channel labeled ISS RPa and listen. Additionally I added a lower case letter at the end. The reason for this is that there are other ham radio rigs on board the ISS such as APRS and I didn’t want to get confused. In addition I also added RP for Repeater. Obviously it starts with ISS so I know what satellite I am dealing with. Some items to note, I gave each channel a specific name. This allows me to easily adjust for doppler as things get quite busy when working the ISS Crossband repeater. I have programmed 5 channels for the ISS Crossband Repeater.
#BAOFENG CHIRP PROGRAMMING DOWNLOAD#
You can download Chirp here if you don’t already have it.īelow is a screenshot of a portion of my chirp file for my FT-857. This is what I use for my Yaesu FT-857D as well as my various handhelds like my Baofeng radios. The best way to handle doppler is to pre-program the frequencies into your radio. In order to access the crossband repeater, it requires a 67 Hz tone on your radio. The new crossband repeater on the ISS has an uplink frequency of 145.990 mHz and a downlink frequency of 437.800 mHz. As the ISS moves away from you, you will have to tune down another 5 kHz. Just tune down 5 kHz, and you wil hear it. As it is more overhead, you will hear it become noisy in your receiver. In the case of the ISS, what you have to do is to listen a little bit higher when it is coming at you. It is the same phenomenon as a passing train blowing its whistle, and you hear the tone of the whistle drop as it passes by you. What is happening is that as ISS is moving and transmitting, you have to have to adjust your receive/downlink frequency. If you have never done any space communications via ham radio, there are some things to get acquainted with. Early reports indicate that the receiver is quite sensitive and can be used with just an handheld such as a Baofeng. This is great news as it has been quite a while since anything significant has happened with Ham radio on board the ISS. As of September 2, 2020, the new FM Crossband repeater on board the International Space Station is activated.
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