Realistic TRC-465

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a365
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Realistic TRC-465

Postby a365 » Fri Aug 25, 2017 11:01 pm

Hello Goldfinger:

I just got my hands on this little TRC-465 AM/SSB radio and want to change the TX & RX for more HiFi sound in both modes if possible

I would like to get your suggestions and advise what caps to change

Radio is very similar to the Uniden 122,Cobra 146 GTL,Realistic TRC-451,Uniden 840,etc...

I am including the schematics from the service manual


Thank you in advance for your great help
A365
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Re: Realistic TRC-465

Postby Goldfinger » Tue Aug 29, 2017 10:03 am

i was ill for a week and not around. I'm still not %100 but I'll get to it soon once I feel a little better.

cheers!
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Re: Realistic TRC-465

Postby a365 » Tue Aug 29, 2017 1:42 pm

Hi Goldfinger:

I am sorry to hear that you where ill Sir,I hope you get well soon

This is not a priority,is just one of my new radios to play with when the time comes


Best Regards
A365
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Re: Realistic TRC-465

Postby Goldfinger » Fri Sep 01, 2017 3:42 pm

I wish people would scan schematics with at least 150dpi. It's a waste of time to post blurry ones. (I'm not talking about you a365) So many of the schematics at cbtricks are low res. This one looks like 50dpi or less... lol
I'm looking now and will post soon. Thanks for the schematic :mrgreen:
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Re: Realistic TRC-465

Postby Goldfinger » Fri Sep 01, 2017 8:34 pm

Transmit:

C111: Change to 2.2uF-4.7uF, 25 volts or greater, non-polarized
C108: This cap is for positive feedback so making it smaller shifts
the boost frequency higher. Change to .005uF, 16 volt or greater disc or Mylar
C104: This is the SSB Bal-Mod cap. Change to a 1uF-2.2uF 25 volts or greater, non-polarized
C165? C166? (too fuzzy): (It's the .01uF cap right above Q36 on the schematic driving the Base.) Change to 2.2uF-4.7uF, 25 volts or greater, non-polarized


Receive:

C24, C27: Change to 2.2uF-4.7uF, 25 volts or greater, non-polarized
C26: make lower in value for more highs
C170: Change to 2.2uF-4.7uF electrolytic, 16 volts or greater. Observe polarity
C122: Change to a 1000uF, 25 volt Electrolytic. Observe polarity.

Injection:

At the Q36 end of (C165? C166?) through a 10uF
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a365
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Re: Realistic TRC-465

Postby a365 » Sat Sep 02, 2017 3:23 am

Hello Goldfinger:

I Hope you feel better now and I want to thank you for taking the time to guide me in my HiFi quest on CB Radio :D

Have a nice Holiday Weekend
A365
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Re: Realistic TRC-465 TX & RX Capacitor Location

Postby a365 » Mon Sep 04, 2017 7:59 pm

Hi Goldfinger:

The capacitor in question for Direct Injection is C166 and connects to R185

Also I took some screenshots from the service manual for the capacitor locations that will help members in the future if they decide to do these modifications

Image

Image

I hope this helps
A365
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Re: Realistic TRC-465

Postby Goldfinger » Mon Sep 04, 2017 8:11 pm

Thanks
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Re: Realistic TRC-465

Postby a365 » Mon Sep 04, 2017 10:38 pm

Hi Goldfinger:

Thank you for your great help Sir

Best Regards
A365

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