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Realistic TRC-448 AM/SSB?

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Old 04-21-2006, 10:33 PM
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Default Realistic TRC-448 AM/SSB?


Does anyone have any information on this radio? What chassis is it built on? History? I picked one up and I cannot find much information about it. Does anyone have one? Do you like it? Please let me know.

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Old 04-22-2006, 06:45 AM
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Hope this helps;

REC86345
Models include:- Courier Blazer 40D/Renegade 40/Rogue 40/Nightrider 40DR/Ranger 40D, Fannon Fanfare 125F/182F/184F/185PLL/185DF/190F, Realistic TRC448

Uses simple 8 bit binary programming.

Easily modified by changing the loop mixing crystal.
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Old 04-25-2006, 06:02 PM
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its a really good solid radio-- lots of power too with very little effort (for a cb)
you will be able to get some decent power out of it with just peaking it up-- cranks up real easy
Not much for actual mods for it... for extras go with what Peddler said-- thats the easest way

Its a good performer
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Old 04-25-2006, 07:44 PM
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That is a great little Radio.
Bennie over at CBTricks has the VR`s here->

www.cbtricks.com/radios/realistic/trc_448/

Don`t let anyone talk you into cliping the AMC in that radio, just tweaking the VR`s and it is a BOOty SPaNking radio.
I am almost sure It used a couple of chunky transistors in push/pull in lue of the Audio IC that was in most of them at that time.
Smoking SSB for a single final/fcc cert rig.
1306 driver and a 1307 final...
There is a mod to open the clarifier for TX/RX
I have that info somewere ......
I will look around.

73
Jeff
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Old 04-26-2006, 09:58 PM
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Sounds good, Any information would be great! Thanks for the info so far.
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Old 05-04-2006, 09:40 PM
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I had good luck with my realistic radios only one out of the ones i owned that gave me any greif was the earlier trc-465
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Old 05-05-2006, 05:04 PM
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Default 448 vs. 458

is there much difference between the trc 458 & trc 448

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Old 05-07-2006, 09:47 PM
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BIG difference.

448 came from an entirely different vendor (factory). Pretty sure their name was "NDI", for Nihon Dengyo Inc", or something like that. That's the reason you've never seen that oddball PLL chip in any other radio. NDI wasn't the biggest supplier to USA name brands, but RatShack sold this one, made with the "Realistic" label stuck on the front and back. Parts can be hard to track down. Not many junkers out there to rob for parts.

The '458 is a Uniden product, likewise a "private label" source for RatShack way back then. The same main circuit board appeared in a handful of other brands/models from 1978/79. Has the big, fat "uPD-858" Pll chip, which is not "locked", and can be modded for added frequency coverage. The rest of what's inside is completely different from any NDI radio, but similar to the TRC-457, original President Madison and Washington, the ones with the 4-pin mike socket. President (then called American Radio) also sold a mobile version. The model name? Can't remember. Robyn SB-520D, Cobra 139XLR base radios were also made by Uniden, and had the same main circuit board.

The one heartbreaking weak spot is the tiny Omron MX-3P relay it uses to transfer from receive mode to transmit. A high-mileage radio may have a worn-out relay. Can't get them any more. A sharp horse-trader will know this, and may "harvest" the good relay from a low-mileage radio, putting a worn-out one in before he sells the thing. Look to see if the wire retaining spring is still snapped over the relay. If not, someone could have changed the relay, or removed it to try cleaning the contact points. Seldom helps. Once the thin electroplated layer on those tiny points wears off, no amount of cleaning will make it work for more than a week at a time. A "lost" retaining spring at least tells you someone messed with the relay (for whatever reason), and lost the thing.

The noise blanker is pretty good in these, if it's adjusted right. Tends to bleed from strong nearby stations worse than the blanker found in newer Uniden radios that have the MB8734/8719 PLL chip. Still better than no blanker at all.

73
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