Ok the story so far.. with Lous help we found we can get HEAPS of deviation, but not enough tone, or enough tone but not enough tone. Does anyone know what the...
HI Andre, The tone should be running at around 15% of your deviation so with 4kHz deviation you would run about 600Hz deviation for the tone. The idea is that...
I'm guessing the module output is about 100mVp-p (sometimes they go up to 1Vp-p) but the actual level should be listed in the FM91 Service Manual. When you...
Thanks to all who replied. To explain a little further the "retro" fit. The encoder has wired to run all the time, rtaher than being swithced on or off for...
Hi all, correct me if I'm wrong, but after Intalling A genuine tone board with an Expansion kit, I followed the instructions in the service manual. Now,...
Hi All, I've been helping Andre with this radio. We installed jumpers on an FM900 CTCSS board to force it to 91.5Hz then installed it into the radio in such a...
Hi Lou, You should not be adjusting the MOD control to change CTCSS levels as this will also upset the tone of the voice signal. Set the MOD control as per ...
I detect a certain misunderstanding of the role of the DEV pot R367. Before setting the audio levels (mike gain) turn DEV R367 fully clockwise (no limiting)....
Hi Mark and Barry, You're right there is a level of misunderstanding which you have both cleared up for me - Thanks. Barry's description clarifies exactly what...
Hi Lou, That sounds good. I was worried you may have been measuring deviation by looking at the audio output of a receiver on a CRO or AC voltmeter with the ...
WHat can i say but WOW! Thanks to all for all the suggestions and pointers, looks like its another trip to Lous for me and the radio!! Will let you all know...
Lou, I looked up the CTCSS encoder test procedure in the manual (part 2 options, section 3.4.1.3 "Test procedure", it states that R357 can be adjusted for the ...
Hi Barry, Agreed, that's my interpretation too. After reading what you and Mark have to say about it I'm thinking that there's something not quite right with...
Hi all Desperatly looking for the schematics of the control pcb and rf pcb for the E band FM900, all of the various links on web pages and here appear not to...
Hi Tony, Have you tried VK2DOT's pages at http://vk2afy.dyndns.org/6mconv/6mfiles.htm Mark ... From: FM900@yahoogroups.com [mailto:FM900@yahoogroups.com] On...
Hi Bob, At the radio end you can use the same instructions as setting up a FM900 for packet radio with audio in and audio out connections. There are some...
Hi Mark, Sorry can't seem to locate the info. Cheers Bob From: Mark Harrison Sent: Friday, March 06, 2009 4:11 PM To: FM900@yahoogroups.com Subject: RE: [Fm...
Hi Bob, I did a quick search with Google, and couldn't find the article I was thinking of - it showed the pinouts and modifications to run audio in and out of...
Hi Mark Thanks for your help it is appreciated Cheers Bob ... From: Mark Harrison To: FM900@yahoogroups.com Sent: Wednesday, March 11, 2009 10:06 AM Subject:...
... Well, all of the necessary signals are available on a connector on the back of the radio, except for COS. COS (5V no signal, 0V when there is a signal)...
That's one of the articles but not the one I was thinking of. I've just remembered that a lot of the information for connecting external audio interfaces is in...
... Here's some info 4 U. FM900 - interconnect cable FM900 DIN Plug 1 n.c. 2 ground 3 n.c. 4 n.c. 5 audio in 6 audio out 7 ptt 8 COS Summarising, at the FM900...
Thank you John ... From: John W VK5BUI To: FM900@yahoogroups.com Sent: Thursday, March 12, 2009 3:13 PM Subject: Re: [Fm 900] interfacing echolink ... Here's...
... It's a pleasure. Feel free to contract me direct if you think I can help in any way. Cheers, John -- EchoIRLP Adelaide's Happy Valley IRLP Node 6527 ...
Well with the help of Lou (3ALB) i now have working CTCSS in my 900. After changing the tone board , the audio module ( U401?) with no success, we decided to...
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