29-08-2020, 07:52 AM
Rob
The 'I can also send DCS Encode/Decode in conjunction with CTCSS so I'll try that.' has me in doubt a bit. Can you actually set that up - have you tried it ??
As I mentioned previously, you will need continuous 91.5 Hz CTCSS to open the repeater and keep it open and then you would need to see how faithfully DCS would pass through the repeater and that DCS is set to open the remote receiver (not CTCSS). My recollection is that DCS signals are basically square wave in shape and may not go through without distortion. Trial and error.
Transmitting the 91.5 plus one other CTCSS tone is probably the best possibility, the 91.5 opens the repeater and the second tone is what the other transceiver CTCSS decode is set to. CTCSS encoders are small these days too. Pick a high-ish CTCSS tone (near 250 Hz) as that is more likely to pass through the repeater receiver/transmitter combination.
The DTMF or 5-tone option would need an extra suitable decoder if the radio itself did not provide that function internally. It was just an idea floating round the brain at the time as I am sure that tones in that range would transit the repeater.
Older radios destined for Europe (plus others) had a 1750Hz tone generator in lieu of CTCSS but I think the idea has been dropped in more recent models. Of course you would need to decode that tone at the far end.
Probably time for you to 'think outside the box' as this is not a problem normally presented to the amateur fraternity : everyone listens to everything.
No simple answers, but some experimentation may provide one.
73 Doug
The 'I can also send DCS Encode/Decode in conjunction with CTCSS so I'll try that.' has me in doubt a bit. Can you actually set that up - have you tried it ??
As I mentioned previously, you will need continuous 91.5 Hz CTCSS to open the repeater and keep it open and then you would need to see how faithfully DCS would pass through the repeater and that DCS is set to open the remote receiver (not CTCSS). My recollection is that DCS signals are basically square wave in shape and may not go through without distortion. Trial and error.
Transmitting the 91.5 plus one other CTCSS tone is probably the best possibility, the 91.5 opens the repeater and the second tone is what the other transceiver CTCSS decode is set to. CTCSS encoders are small these days too. Pick a high-ish CTCSS tone (near 250 Hz) as that is more likely to pass through the repeater receiver/transmitter combination.
The DTMF or 5-tone option would need an extra suitable decoder if the radio itself did not provide that function internally. It was just an idea floating round the brain at the time as I am sure that tones in that range would transit the repeater.
Older radios destined for Europe (plus others) had a 1750Hz tone generator in lieu of CTCSS but I think the idea has been dropped in more recent models. Of course you would need to decode that tone at the far end.
Probably time for you to 'think outside the box' as this is not a problem normally presented to the amateur fraternity : everyone listens to everything.
No simple answers, but some experimentation may provide one.
73 Doug
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.