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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Aug Wed 03, 2011 5:01 pm 
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All you need is a pinout of the chip and an oscilloscope and you will know where to connect the audio signal.


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Aug Wed 03, 2011 7:29 pm 
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Tube Radio wrote:
All you need is a pinout of the chip and an oscilloscope and you will know where to connect the audio signal.


I published the chip part number and link to the chip specs in this thread in the first few post.

http://pdf1.alldatasheet.com/datasheet- ... 3313L.html

Pin 1 is audio output #1 (Pin 12 is audio output #2 and it's not used)
Pin 5 is audio input #1 (Pin 9 in audio input #2 and not used)

What are you saying? What kind of test procedure are you calling for? Take a look and tell me what you would do? What would you test and how? What would you change? It is a preamplifer as well a AGC, so it could just be over driving the down stream audio signal path?

TH users know if you over drive the input it will sound bad. That is easy to fix by just turning the input source down. The problem with old iPods is their sound degrades as you lower volume, if using the line out/phono out, verses the serial connector. I think the chip is a poor choice, but who knows it could just be a bad implementation. What are you thinking of changing?

Chip or not the down stream capacitor change helps. Why some get good results with 0.15 uF and others 10 uF I don't know. There seems to always have been huge variation between runs of TH units. I don't know if that capacitor is interacting with the chip which is before in the audio chain or is improving things down stream.

The best solution is get a good limiter compression board off of eBay, put that in and by pass that chip altogether. Those boards pre made are about $30-$40. At that point one might go for a SSTran, however the TH has more power and the cool self tune antenna deal.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Aug Wed 03, 2011 7:50 pm 
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Just remove the chip and apply your audio signal to where pin 1 of the chip was connected. If there is not enough gain you can use a transistor or op amp to increase gain.


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 1:29 am 
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how about TALKING HOUSE TH4.3 :?: is it better or worse


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 10:49 am 
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budzy21 wrote:
how about TALKING HOUSE TH4.3 :?: is it better or worse

Nothing like dredging up a 3 year old thread, lol.

The rear panel of the TH 4.3 looks very close to exactly like that of the TH 5, and the front panel is identical, so assuming that their broadcasting quality is similar to exactly the same, wouldn't be a stretch.

Remember, these units are designed to carry a voice message, not music. As such, they are simply not going to work as well as an SSTrans, which has additional controls, for music reproduction.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 12:34 pm 
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I suspect that the best way to make it work is to remove the audio chip that does the processing and feed the audio to where its output pin would have conencted.


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 12:59 pm 
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Was posted in thread(s) years back the 5.0 is better than any of the early units, how much I dunno... The 5.0 I have here sucks for music, apparently even those are hit or miss...


Tom


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 2:26 pm 
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Any idea where I can get one besides Ebay?

I wouldn't mind modding one to bypass the audio chip as that seems to be where the audio quality problem is.


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Thu 26, 2014 10:06 pm 
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A few years ago, I bought one when they were discounting, at $100.00.
Here's their homepage;
http://www.iamradio.net/index.php

eBay would probably be your best bet now, though.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Sun 29, 2014 8:11 am 
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fifties wrote:
budzy21 wrote:
how about TALKING HOUSE TH4.3 :?: is it better or worse

Nothing like dredging up a 3 year old thread, lol.

The rear panel of the TH 4.3 looks very close to exactly like that of the TH 5, and the front panel is identical, so assuming that their broadcasting quality is similar to exactly the same, wouldn't be a stretch.

Remember, these units are designed to carry a voice message, not music. As such, they are simply not going to work as well as an SSTrans, which has additional controls, for music reproduction.


I tried to put one of those things together but failed badly wast of money for me :( Oh well life goes on


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Sun 29, 2014 8:19 am 
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budzy21 wrote:
fifties wrote:
budzy21 wrote:
how about TALKING HOUSE TH4.3 :?: is it better or worse

Nothing like dredging up a 3 year old thread, lol.

The rear panel of the TH 4.3 looks very close to exactly like that of the TH 5, and the front panel is identical, so assuming that their broadcasting quality is similar to exactly the same, wouldn't be a stretch.

Remember, these units are designed to carry a voice message, not music. As such, they are simply not going to work as well as an SSTrans, which has additional controls, for music reproduction.


I tried to put one of those things together but failed badly wast of money for me :( Oh well life goes on

That's a shame. Had you thought to make a post asking if a forum member could build it for you (for some compensation, of course) ?

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jun Sun 29, 2014 9:26 am 
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no i am new in here. it was four years ago it don't matter i have three FM radio stations two i made one is a professional radio station
requiring a fcc license. i want to get in on AM radio station frequencies.


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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jul Sat 12, 2014 2:33 am 
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Fifties, when I go to their site they say dramatically improved audio. You think they picked up info from this thread? 8)

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jul Sat 12, 2014 6:07 am 
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drmitch wrote:
Fifties, when I go to their site they say dramatically improved audio. You think they picked up info from this thread? 8)

That's interesting. Why would they bother about it, for a simple voice real estate message, which is all it was ever designed for?

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jul Sat 12, 2014 4:17 pm 
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Maybe they are looking at the antique radio transmitter market angle.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Jul Sat 12, 2014 10:06 pm 
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It would be a small, niche market indeed, but it would expand their audience potential, beyond being just an assisting device for Real Estate sales.

The unit is really a cool piece of equipment, with the front digital frequency readout and total ease of adjusting it.

The problem that I had with mine, was an always present buzzing noise in the background. I have that to a small extent at times with my SSTrans as well, but to a much lesser extent.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Dec Tue 23, 2014 3:52 pm 
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The thread that won't die! :roll:
Since these old AM radios are multiplying like rabbits at my home I was looking at the older pre I.AM TH5. that are for sale.
I'm a total novice, definitely not an audiophile listener and am hoping the transmitter will let me use my radios. There really isn't jack for AM here in SE Georgia (can't even get WSM) so being a cheap skate the TH5 seems like a good option to play some vintage Holiday music.
So as long as I limit the input and pay attention to ant. placement I should be good to go?

Thanks,
Mike

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: Dec Tue 23, 2014 11:55 pm 
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You might try grounding it, to see if that helps, and I noticed with mine that different inputs from the PC, Sirius receiver, etc., yielded different qualities of output.
Also, there is S/W called audio-tools that might help. Here's a link; http://www.audio-tool.net/

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: May Mon 01, 2017 6:44 pm 
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Can we r I this for another go round?

Ive been playing with mods on my TH5 unit. Here's what's been learned...
C301 change to 0.1 provides too much bass. I'm going to try something halfway between stock and the 0.1.

Pulled out DVR chip to lessen load on PSU. Its socketed and no additional mods needed. I did note slight lowering of hum.

Tried rerouting RF out from local antenna to F connector so I could use a remote antenna through the ATU. That didn't work at all. Tuner simply wouldn't tune no matter what was on end of coax. Yes I did properly reroute the RF in my mod. Ended up putting it all back.

Increased value of PSU filter cap to 4400mfd and bypassed it with small ceramic. This did lower my hum a little.

Pulled AGC chip and piped audio direct in. Made big difference in audio quality but hum came up significantly. I think this has best potential to improve audio but it looks like it needs to be done with an isolation transformer. You also must run external limiting. I will be revisiting this mod. I run full spectrum processing anyways from a PC.

Mods to look into..
I may try feeding unit off well filtered external DC supply.


Last edited by ke4mcl on May Mon 01, 2017 6:57 pm, edited 1 time in total.

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 Post subject: Re: Talking House AM Transmitter MODIFICATION IDEAS HELP?
PostPosted: May Mon 01, 2017 6:53 pm 
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If the supply that came with it does not have ceramic caps across the rectifiers that could cause some hum.


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