On 30th August 2020, I went to Parit Buntar, Tanjung Piandang, Kuala Kurau and Bagan Serai for a short vacancy. As they're located at coastal areas of Northwest Perak, so I planned to receive Perlis FM 102.9MHz from Padang Pauh there.
In fact, Perlis FM 102.9MHz was not receivable there. While I was driving from Tanjung Piandang to Parit Buntar, I received some unknown signal on FM 102.9MHz, it was not Perlis FM, but it was Perak FM.
Initially I suspected Perak FM 102.9MHz transmission is from Bukit Palong, Kedah to cover Pengkalan Hulu, so I sent a FM DX verification email to RTM for confirmation of FM 102.9MHz transmission.
Today I receive RTM email regarding FM DX verification. RTM Perak FM 102.9MHz that I received in Titi Serong, Perak is transmitted from Lawin, Perak, not Bukit Palong that I speculated earlier.
Lawin is located between Lenggong and Gerik. In Lawin, RTM has Nasional FM on 101.7MHz (same frequency as Radio Klasik FM 101.7MHz in Bukit Genting which is for Balik Pulau).
RTM Perak FM 102.9MHz actually covers Lawin where it is a blind spot area of FM 94.2MHz Bukit Ladang Teh and FM 96.2MHz Gerik. In Lawin, RTM Perak FM 94.2MHz from Bukit Ladang Teh is likely interfered by far away transmitted Radio Thailand Yala FM 94.25MHz. Therefore, RTM launches Perak FM Lawin frequency FM 102.9MHz.
==RF analysis of Perak FM 102.9MHz Lawin==
102.7MHz: IKIM FM Gunung Kledang
102.9MHz: Perak FM Lawin
<200kHz, OK>
102.9MHz: Perak FM Lawin
102.9MHz: Perlis FM Padang Pauh
<200kHz, OK>
The reception of RTM Perak FM 94.2MHz from Bukit Ladang Teh starts to have interference from Radio Thailand Yala FM 94.25MHz from Lawin to Gerik. In Gerik, Perak FM 94.2MHz signal becomes Radio Thailand Yala FM 94.25MHz.
After I noticed that Perak FM 102.9MHz is from Lawin, so let's analyze if Perak FM 102.9MHz is from Bukit Palong, see what will happen.
==RF analysis if Perak FM uses 102.9MHz in Bukit Palong==
102.7MHz: IKIM FM Gunung Kledang
102.9MHz: Perak FM Bukit Palong (apply directional antenna)
<200kHz, OK>
102.9MHz: Perak FM Bukit Palong (apply directional antenna)
102.9MHz: Perlis FM Padang Pauh
<200kHz, OK>
102.9MHz: Perak FM Bukit Palong (apply directional antenna to Pengkalan Hulu)
103.0MHz: Nasional FM Gulau
<100kHz, NOT OK>
102.7MHz: Nasional FM Bukit Dedap
102.9MHz: Perak FM Bukit Palong (apply directional antenna to Pengkalan Hulu)
<200kHz, NOT OK>
If Perak FM 102.9MHz is transmitted from Bukit Palong, although it transmits by using directional antenna (regardless panel, Yagi or log-periodic), but it can cause interference to Nasional FM 102.7MHz Bukit Dedap and 103.0MHz Gulau coverage, even Perlis FM 102.9MHz Padang Pauh coverage can be interfered too.
I verified with RTM engineer that RTM Lawin radio stations Nasional FM 101.7MHz and Perak FM 102.9MHz are operating at 250W power only.
It is unbelievable to receive Perak FM 102.9MHz Lawin frequency in Titi Serong and Kuala Kangsar. Here is my DX information:
- Frequency: FM 102.9MHz
- Power: 0.25kW
- Transmitter site: Lawin, Perak
- Receiving site: Titi Serong, Perak
- Distance: 70km
==Coverage map of RTM Lawin==
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