In the past from 2016 to 2019, Philip DXing Log highlighted about review and frequency analysis if CityPlus FM expands coverage to Penang with few likely suitable frequencies and sites.
In 2017, I suggested FM 93.1MHz Bukit Larut as CityPlus FM Penang frequency transmission. In fact, I realized that FM 93.1MHz cannot be used for Bukit Larut transmission because it interfered RTM Asyik FM 93.1MHz Bukit Ladang Teh coverage in Lenggong and Lawin, Perak. In terms of history, RTM Asyik FM already used FM 93.1MHz in Lenggong since 2015/16. During my suggestion of CityPlus FM Penang frequency with FM 93.1MHz Bukit Larut, actually I had no latest and updated frequency database. In addition, I had never been in North Perak before, hence I did not get any information. Until 2019, I got some information on FM 93.1MHz transmission in Lenggong, Perak. Back to 28th December 2019, I traveled to Taiping, when I was in Enggor and Salak Baru, I recorded the footage of Asyik FM 93.1MHz Bukit Ladang Teh signal.
Therefore, FM 93.1MHz is not a frequency can be used in Bukit Larut.
Back to 2014, I proposed FM 105.7MHz as IKIM FM Taiping frequency in Bukit Larut (0.5kW) to cover Northwest Perak as there could not receive IKIM FM on 89.0MHz from Gunung Jerai, meanwhile 102.7MHz signal was very bad.
Currently FM 105.7MHz is still a vacant frequency for Bukit Larut transmission (not medium and high power). If CityPlus FM is assigned on 105.7MHz by MCMC in Bukit Larut to cover Penang, actually FM 105.7MHz is not a suitable frequency to beam Penang from Bukit Larut as Penang listeners can get co-channel interference in Penang (Island) and some Seberang Perai areas when listen to CityPlus FM on FM 105.7MHz because RTM Kedah FM is using same frequency in Gunung Raya.
105.7MHz: CityPlus FM Bukit Larut
105.7MHz: Kedah FM Gunung Raya
Looked at RF analysis map photos (where I was given by MCMC personally in 2016. Disclaimer: Only frequency analysis, not for radio station), FM 105.7MHz Bkt Larut never gives interference to Kedah FM 105.7MHz Gunung Raya, but this applies only normal antenna pattern of standard Bukit Larut coverage without beaming directional to Penang direction much.
If CityPlus FM 105.7MHz Bukit Larut beams to Penang (0.5kW power), it can interfere Kedah FM 105.7MHz Gunung Raya coverage in Langkawi and Perlis coastal area as Bukit Larut elevation is higher than Gunung Jerai and hills in Penang. In addition, as Georgetown and some Seberang Perai can receive RTM Kedah FM 105.7MHz Gunung Raya (thus DX signal), but CityPlus FM 105.7MHz Bukit Larut still faces co-channel interference from Kedah FM 105.7MHz Gunung Raya in Penang Island (Georgetown), despite reception in Seberang Perai has no interference.
Listeners will feel uncomfortable to listen to CityPlus FM in Georgetown on 105.7MHz from Bukit Larut when it is interfered by Kedah FM 105.7MHz.
CityPlus FM can use FM 105.7MHz in Bukit Larut at 1kW power and beam to Penang if RTM Kedah FM migrates its Gunung Raya frequency to FM 105.5MHz, but it is not easy due to MCMC regulations and cost of migrating frequencies.
If Kedah FM migrates its Langkawi frequency from 105.7MHz to 105.5MHz, at least CityPlus FM 105.7MHz Bukit Larut and Kedah FM 105.5MHz Gunung Raya will not interfere each other in Penang and Langkawi anymore as wider frequency separation.
105.5MHz: Kedah FM Gunung Raya
105.7MHz: CityPlus FM Bukit Larut
<200kHz, OK>
For current situation, although FM 105.7MHz is suitable in Bukit Larut for only Taiping coverage (minus South Seberang Perai), thus lower power transmission, but FM 105.7MHz is not suitable for Bukit Larut transmission to cover Penang by beaming to northwest direction. Therefore, CityPlus FM Penang frequency proposal is not suitable by assigning FM 105.7MHz in Bukit Larut for Penang transmission coverage (beaming to northwest).
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