Midland GB1 PMR446 UK legal mobile transceiver - overview & CTCSS changing.
9.8 هزار بار بازدید -
4 سال پیش
-
Today, it's nothing to do
Today, it's nothing to do with CB radio, but PMR446, which is a 16-channel 500mW UHF allocation for licence free operation....as long as equipment sticks to strict guidelines, such as a non-removeable aerial. Unfortunately that stops us from checking the radio over into our test set too.
Most PMR446 equipment is of the hand-portable type ranging from little more than kid's toys to high performance rugged radios for security use.
Cheap sets usually have no CTCSS so you hear anyone else on a particular channel. However, higher in the range models have have CTCSS or DCS or both to mast interference from other users....they are still there, but with CTCSS or DCS you can no longer hear them.
We use some Retavis RT24 PMR446 radios around the place & want to have them able to communicate with the Midland GB1 featured here. It turns out than channel 1 on both devices is the same @ 446.00625Mhz, but the CTCSS codes are different. I discovered the Retavis radios use the CTCSS tone 114.8hz & in this video I reprogram the CTCSS code in the Midland GB1 to suit this.
We will be doing an 'on the air' test between two of these later on today over our usual teat route. The base radio will have the aerial cable through the window & mounted on a biscuit tin (for a ground plane) as high as convenient & the attached cable will allow. The vehicle set will have the aerial in the centre of the roof.
Recorded 5th December 2020
Richard, G0OJF,
Lincolnshire, UK
Most PMR446 equipment is of the hand-portable type ranging from little more than kid's toys to high performance rugged radios for security use.
Cheap sets usually have no CTCSS so you hear anyone else on a particular channel. However, higher in the range models have have CTCSS or DCS or both to mast interference from other users....they are still there, but with CTCSS or DCS you can no longer hear them.
We use some Retavis RT24 PMR446 radios around the place & want to have them able to communicate with the Midland GB1 featured here. It turns out than channel 1 on both devices is the same @ 446.00625Mhz, but the CTCSS codes are different. I discovered the Retavis radios use the CTCSS tone 114.8hz & in this video I reprogram the CTCSS code in the Midland GB1 to suit this.
We will be doing an 'on the air' test between two of these later on today over our usual teat route. The base radio will have the aerial cable through the window & mounted on a biscuit tin (for a ground plane) as high as convenient & the attached cable will allow. The vehicle set will have the aerial in the centre of the roof.
Recorded 5th December 2020
Richard, G0OJF,
Lincolnshire, UK
4 سال پیش
در تاریخ 1399/09/15 منتشر شده
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