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Budget and Entry Level Transceivers - For discussion of budget or entry level radios such as Baofeng, Wouxun, Puxing and other radio communications designated as commercial but not targeted for Amateur or GMRS. Also included are MURS and ISM 900MHz designed radios.

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  #1 (permalink)  
Old 05-27-2018, 5:19 AM
Join Date: Apr 2010
Location: france
Posts: 2
Default TYT TH7800 - CTCSS & DCS doesn't work if the TX power in above MID1

Hi all,
I'd like to share my experience with this tranceiver.
Fisrt I wanted to have a cross band repeater for good price and it does the job nicely.
I mainly using this tranceiver on UHF without any issues even if I think that the mic gain should be improved (you really have to talk close to the mic).

I noticed one really strange thing (probably a bug) when the CTCSS or DCS is setup it's working fine until you don't use the TX power above MID2 (remember that it's LOW/MID2/MID1 and HIGH).
So whe the power is MID1 or HIGH the CTCSS or DCS doesn't work anymore...
My first idea was that I was to close from the TH7800 with my pocket MD390, so I went at 1Km away and noticed the same issue.

hoping that my explanation is clear and I'm curious to hear if I'm missing something or if someone got the same problem as well.
PS I never found a way to setup DCS frequency on the TH7800 menu (so only did it via the PC).

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Old 11-08-2018, 3:35 PM
Join Date: Nov 2017
Location: Pleasanton, CA
Posts: 1
Default TYT TH7800 - CTCSS & DCS doesn't work if the TX power in above MID1


I have Baofeng portables and TH-7800 mobiles to use on a UHF repeater with DCS codes. The portables are working O.K. after an easy setup but cannot get the TH-7800 mobiles to open the repeater. The DCS codes were checked on a service monitor (At low power however) and reversed the DCS polarities with no success.

Interesting you found the power level may affect the CTCSS/DCS operation and will investigate this as a possible cause.

Did you find a solution to your problem and if not, I will report back with further observations. I am sure my CTCSS is working O.K. at high power on VHF repeaters but donít use DCS. Until now have not used UHF other than to listen.

73, Mike
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  #3 (permalink)  
Old 11-08-2018, 6:53 PM
  Amateur Radio Operator
Amateur Radio
Join Date: Jul 2014
Location: Newnan, GA
Posts: 259

Sounds like the deviation is getting out of spec with the higher power outputs. Put it on a service monitor to know for sure.

Frank KK4YTM
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  #4 (permalink)  
Old 11-17-2018, 4:31 AM
Join Date: Apr 2010
Location: france
Posts: 2

thx all for your comment.
I never found any solution which is really anoying as I like to use CTCSS/DCS to avoid to play with the squelch when crossing some noisy areas during multiple cars trip.

If someone have the same experience or even better, a solution, i would be more that happy.

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ctcss, dcs code, th7800

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