HFU HF Underground
Loggings => 10/11 meters => Topic started by: R4002 on September 30, 2021, 2133 UTC
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25695 AM 25.695 MHz AM - SS taxi dispatch, YL dispatcher with roger bleep
25745 AM 25.745 MHz AM - SS taxi cab dispatcher, weak
25775 AM 25.775 MHz AM - SS taxi dispatch, YL dispatcher, roger beeps heard
25985 AM 25.985 MHz AM - Weak AM signal
26205 AM 26.205 MHz AM - Strong AM signals, SS
26375 AM 26.375 MHz AM - SS OMs, likely truckers or freebanders
26555 LSB 26.555 MHz LSB - Spanish language SSB calling frequency (see also: 27455 USB, etc)
26565 AM 26.565 MHz AM - SS OMs, with some QRM from 26.570 MHz LSB
26570 LSB 26.570 MHz LSB - Spanish language chatter, likely QSY from 26.555 LSB
26575 AM 26.575 MHz AM - Spanish language AM activity, likely QSY from 26585 AM Mexican trucker/freebanders
26585 AM 26.585 MHz AM - Mexican trucker freeband frequency, busy
26605 AM 26.605 MHz AM - SS OMs
26705 AM 26.705 MHz AM - Spanish language chatter, 26 MHz freeband calling channel
26715 AM 26.715 MHz AM - Spanish language chatter, 26 MHz freeband calling channel
26725 AM 26.725 MHz AM - Spanish language chatter
26735 AM 26.735 MHz AM - SS OM activity, similar to 26.705 AM and 26.715 AM
26805 AM 26.805 MHz AM - UNID AM signals
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I was listening yesterday late afternoon and early evening, lots of DX from Latin America, below, inside, and above the CB band.
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Seems this morning (afternoon in Europe and Russia) the band was also open. Via one of the Russia-based KiwSDRs, Inoted numerous signals on the UK FM CB frequencies, including UK FM CB channel 19 27781.25 FM and several others. FM signals on frequencies like 27.600 MHz and 27.605 MHz were also noted - Russian taxicab dispatchers mixing in with UK FM CB signals on 27.60125 MHz..
Some SSB activity around 27555 and a mixture of AM, FM and SSB signals within the 26960-27410 band...including the strong data link systems on 26945 and 26960. I did some research and Google translate and found out that 26.945 MHz, 26.950 MHz, 26.955 MHz, 26.960 MHz and several other frequencies are, in Russia, heavily used for campus-wide alarm system data links and other systems that we use 27.255 MHz (and 26.995/27.045/27.095/27.145/27.195) for.
Maximum power output on 26.945 and 26.960 is 2 watts (according to my research anyway).
In addition to those signals, POCSAG paging signals were heard on several frequencies in the 26 MHz region, considering the fact that the UK FM CB frequencies were booming in, I imagine at least some of the 26 MHz POCSAG signals were also from the UK or Western Europe.
Also, an odd data signal centered around 27.003 MHz was coming in, mixing with CB signals on 27000 and 27005. I know stations in Finland have monitored POCSAG paging signals on 27007 or close to it - maybe 27.0075 MHz or 27006.5...this could be another one of those on-campus paging / telemetry systems using an offset frequency.
Maybe today will be another big band opening for us as well.