RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Commercial, Professional Radio and Personal Radio > Budget and Entry Level Transceivers


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.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 05-09-2018, 3:34 PM
Member
   
Join Date: Jun 2014
Location: Boyertown, PA
Posts: 9
Default Radioddity gd-77 DMR

Hey guys,

So working on setting up a DMR radio for my dad and i have been around the block many years of the analog ham radio stuff since i was a kid. However i recently got the above named radio and programmed it to how it should be and all i get is a "connect fail" with multiple repeaters. When i research the repeaters on the site the grid shows im well within range of the actual repeater. Any ideas? Thanks!
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 05-09-2018, 9:47 PM
chief21's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Mar 2004
Location: Summer - western NC mountains; Winter - central FL gulf coast
Posts: 750
Default

I'm not familiar with the GD-77, but all DMR radios are programmed in a similar manner. At a minimum, the frequencies (both TX and RX), color code, time slot and talkgroup must be correct. In addition, there are various other digital settings which could prevent the rig from transmitting.

If you believe that your programming is correct, it is possible that you might not be close enough to the repeater(s). It might be worth a short trip to the immediate area of a repeater to see if the radio works there.

If you're not confident in your programming, there are lots of DMR-related web sites and youtube videos to get you up to speed. DMR is quite different from analog!
Reply With Quote
  #3 (permalink)  
Old 05-09-2018, 11:47 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Mar 2006
Location: Richlands, NC
Posts: 37
Default GD 77

Hello, I just got ,my first DMR radio a few days ago, the GD 77. The Radioddity facebook page has a large amount of information. I did not experience your particular error, but I had enough of my own, Research, Research and more BUT its a lot of fun. Good luck Joe
Reply With Quote
  #4 (permalink)  
Old 05-16-2018, 8:37 AM
Newbie
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2016
Location: Lincoln Park NJ
Posts: 3
Default

Hi All,

I am having the same problem, I have followed all the instructions to programming the GD-77. Watched several tutorials to make sure I was doing the right thing. Yet whenever I try to transmit, I receive "Connect Fail". Any thoughts? Confirmed all the TS, Freq., Color Codes are correct. Thanks.
Reply With Quote
  #5 (permalink)  
Old 05-16-2018, 2:51 PM
tunnelmot's Avatar
Member
   
Join Date: May 2007
Location: Conroe, TX
Posts: 128
Default

I don't personally own one, but I heard that the GD77 HAS to have the rx groups filled in for each channel/talkgroup to work properly.
Try that
__________________
"Stay...off...the...R.O.V.E.R"
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 05-16-2018, 3:30 PM
Member
   
Join Date: May 2003
Location: Tampa Area
Posts: 29
Default

I have this radio check to see in the software if you have received only checked I do believe that it does say failure if it's in receive mode only
Reply With Quote
  #7 (permalink)  
Old 06-15-2018, 6:19 PM
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Westlake Village, CA
Posts: 2
Default

I am also having this same problem on my local repeater. The only way I have found to workaround this is to set both the tx and rx frequencies to the same freq. This seems to allow it to transmit although on the wrong tx freq. Anytime I make an offset (even if I switch the tx and rx freqs the wrong way) it gives me the "connect fail" error. Ive confirmed my codeplug is setup properly and have even reached out to the repeater admins who've confirmed this. It seems to be related to the radio. Any suggestions?
Reply With Quote
  #8 (permalink)  
Old 06-16-2018, 5:18 PM
usswood's Avatar
Member
   
Join Date: Nov 2004
Location: Terre Haute, IN
Posts: 1,130
Default

Quote:
Originally Posted by AJ6BL View Post
I am also having this same problem on my local repeater. The only way I have found to workaround this is to set both the tx and rx frequencies to the same freq. This seems to allow it to transmit although on the wrong tx freq. Anytime I make an offset (even if I switch the tx and rx freqs the wrong way) it gives me the "connect fail" error. Ive confirmed my codeplug is setup properly and have even reached out to the repeater admins who've confirmed this. It seems to be related to the radio. Any suggestions?
A screen shot of your programming software would go along way
__________________
usswood
Reply With Quote
  #9 (permalink)  
Old 06-16-2018, 9:23 PM
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Westlake Village, CA
Posts: 2
Default Found a Fix!

Let me start by saying this is a very dangerous fix and can possibly brick your radio. If you are uncomfortable proceeding I would suggest waiting for another firmware to come out which will (hopefully) address this problem. None the less I found a fix for this issue. From what I've read "Memory and / or factory resetting the GD-77 can corrupt information in the RF alignment data block at address 8F000 onward". Also from what I read, this only affects GD-77s with firmware later than 2.6.6. The link below will walk you through the fix (about 3/4 down the page). You will be doing a very low level fix and editing the radio's source code with a HEX editor. Its actually not as scary as it sounds as long as you follow the directions exactly. (measure twice cut once...) That said, I will repeat, you can possibly brick your radio, so be very careful making this change. Good luck!

Radioddity GD-77 Alignment / tuning / modifications (mods)
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 4:38 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions