Uniden HR-2510 RX/TX, hi-fi mods

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Goldfinger
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Uniden HR-2510 RX/TX, hi-fi mods

Post by Goldfinger »

Receive:

Change C35 to a .001uf ceramic disc or mylar
Change C31, C36, C105, C107 , C102 to 2.2uF, 50 volt non-polarized electrolytic.
Change C34 to a 22uF, 16 volt electrolytic. (observe polarity)
Change C109 to a 2.2uF, 16 volt tantalum or electrolytic. (observe polarity)
Change C95 to a 1000uF, 25 volt electrolytic. (observe polarity)

Transmit:

Change C63 and C148 to a 1uF, 16 volt tantalum, observe polarity. (More bass? use a 2.2uF tantalum)
Change C147 to a 1uF 50 volt mylar. (More bass? use a 2.2uF mylar)
(Remember you can always use higher voltage cap ratings, never lower.)


To disable the AMC on AM while leaving the SSB ALC intact and adjustable:

Lift one end of R100


Parts location can be found on this diagram:

http://www.cbtricks.com/radios/uniden/h ... in_pcb.gif

(Thanks CBTricks!)

President HR2510 mod mods bass hi fi hifi wide audio
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a365
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by a365 »

Hello Goldfinger:

Any suggestion on Direct Injection for this radio ?


Thanks in advance
A365
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by Goldfinger »

Back hole of C147
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a365
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by a365 »

Hello Goldfinger:

Thank you again for your advice Sir

I will start to re-cap this old radio and in the process I will do the changes for HiFi TX & RX and install the socket for Direct Injection

Now it's time for hot iron to fill the room with flux fumes :twisted:


Best Regards
A365
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by EastSideDuck727md »

Goldfinger,is a VFO windup possible on a 2510?
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by Goldfinger »

If it's gonna work the RIT will have to be stock. Try installing a 470uF, 16V or higher electrolytic with the + to either the anode of D150 or the center swiper of VR-111 and the - to board ground.
Changing the value of the cap will change the length of the swoop. (if it works)
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EastSideDuck727md
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by EastSideDuck727md »

Thanks Goldfinger,I always was curious about that. RIT on all of my quarter dime’s are stock. Hell other than ModSquads tuning nothing that was done about 25yrs ago and I did your HiFI mods when I recapped it last year nothing else has been done to this one. Thanks again my friend, 727md with that frozen MidAtlantic wave 🤙
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by EastSideDuck727md »

Afternoon Goldfinger,got another question on the 2510,regarding Tx bandwidth this time. About how wide is the audio using your mods and what is about the max you recommend going? I know it’s lost on alot of receiving stations but I’m still curious. Never got any bad feedback on air im just curious. Thanks in advance. 727Md waving.
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Re: Uniden HR-2510 RX/TX, hi-fi mods

Post by Goldfinger »

With the values in the mod above, since none of the high frequency shunt caps are changed the high end is the same as stock which rolls off about 3.5K-4Khz. On the low end with 1uF caps, it starts rolling off at 60Hz and 3db Down at 45Hz. With a 2.2uF it starts rolling off at 45Hz and is 3db down at 25-30Hz.
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