Search found 684 matches
- Sat Jul 15, 2023 12:14 pm
- Forum: rx and tx mods
- Topic: hifi rx/tx mods for Stryker 497hpc?
- Replies: 5
- Views: 1383
Re: hifi rx/tx mods for Stryker 497hpc?
As far as a windup, not sure if anyone has come up with one as there is no clarifier. Yes, the echo would have to be bypassed if you want wide audio through the mic jack. If the TX is going to be direct injected you wouldn't need to. Bypassing the echo can be accomplished by unhooking the Mic I/P fr...
- Sat Jul 08, 2023 8:54 am
- Forum: rx and tx mods
- Topic: VFO wind up for Stryker 955?
- Replies: 9
- Views: 2502
Re: VFO wind up for Stryker 955?
I think D-rail designed a little wind-up circuit for the Stryker. (He is a sharp guy) One can be constructed for any radio with a varactor that doesn't/can't have isolated TX/RX clarifier feeds. It would have to be custom tailored for each chassis and is beyond the scope of the average experimenter....
- Mon Jul 03, 2023 3:10 pm
- Forum: rx and tx mods
- Topic: VFO wind up for Stryker 955?
- Replies: 9
- Views: 2502
Re: VFO wind up for Stryker 955?
The D-rail $1600 wind-up mod?
- Sun Jun 25, 2023 1:31 pm
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
If it's gonna work on the 2547 you would use a 470 or 1000uF, 16V with the + going to the center leg of VR7 (on the front edge of the main PC board) and the - to board ground.
- Wed Jun 07, 2023 11:31 am
- Forum: Microphones & Mic Wiring
- Topic: turner plus 3 cap help
- Replies: 2
- Views: 331
- Sun May 28, 2023 8:24 am
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: President Madison 858pll First Gen DIRECT INJECTION
- Replies: 2
- Views: 204
Re: President Madison 858pll First Gen DIRECT INJECTION
I've posted the hifi info for that chassis per a previous request but the 858 sideband chassis is not a good choice to hifi. This is because it uses a modulation transformer that can't pass low frequencies. Direct modulated radios like the 148/Grant XL/2000 or Galaxy/Ranger are better choices.
- Wed Mar 01, 2023 11:21 am
- Forum: rx and tx mods
- Topic: Request - Stryker 955 cap mods
- Replies: 26
- Views: 7463
Re: Request - Stryker 955 cap mods
C542 is also on the feedback circuit of the U500A/U500B team. Both sections aren't there for gain, they are set up for roughly unity gain and are strictly for tone shaping. Most of the mic amp voltage gain is in the earlier stages which are wired for flat response, limited only on the low end by the...
- Tue Feb 28, 2023 9:30 pm
- Forum: rx and tx mods
- Topic: Request - Stryker 955 cap mods
- Replies: 26
- Views: 7463
Re: Request - Stryker 955 cap mods
For TX looks like you can make the value of C569 lower.
Try removing C501 to change the feedback circuit of the last mic preamp U500B
Try removing C501 to change the feedback circuit of the last mic preamp U500B
- Tue Feb 28, 2023 12:31 pm
- Forum: rx and tx mods
- Topic: Uniden HR-2510 RX/TX, hi-fi mods
- Replies: 8
- Views: 5897
Re: Uniden HR-2510 RX/TX, hi-fi mods
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...
- Tue Feb 14, 2023 9:47 am
- Forum: rx and tx mods
- Topic: Anytone 5555n II
- Replies: 2
- Views: 275
Re: Anytone 5555n II
Lemme know if you find a schematic..
- Fri Jan 27, 2023 10:36 am
- Forum: rx and tx mods
- Topic: rci 2970n2
- Replies: 14
- Views: 4159
Re: rci 2970n2
Yes, for the hifi conversion, the uF value is whats important not the style of cap. SMT would be better as it will solder in more securely than grafting in a discrete component.
- Wed Dec 21, 2022 12:37 pm
- Forum: rx and tx mods
- Topic: Uniden HR-2510 RX/TX, hi-fi mods
- Replies: 8
- Views: 5897
Re: Uniden HR-2510 RX/TX, hi-fi mods
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)
Changing the value of the cap will change the length of the swoop. (if it works)
- Wed Dec 21, 2022 10:01 am
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
Unfortunately the TX and RX must be isolated (fixed frequency on TX) to easily install a windup.
- Sat Dec 17, 2022 12:25 pm
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
It's been a long time since I worked on one. Does the clarifier work on transmit?
Looking at the schematic it looks like it does.
Looking at the schematic it looks like it does.
- Thu Jul 14, 2022 10:01 am
- Forum: rx and tx mods
- Topic: TX Frequency adjust pot on cbs1000
- Replies: 6
- Views: 460
Re: TX Frequency adjust pot on cbs1000
Not sure but that could be a symptom of low voltage. If the 8 volt TX rail was low it seems like it would affect more parts of the radio. You could put a volt meter on the collector of Q36 and see if it is: A: switching from 0 to 8 volts when you key the mic. B: If it is indeed 8 volts like it's sup...
- Wed Jul 13, 2022 1:57 pm
- Forum: rx and tx mods
- Topic: Cobra 29xlr vfo wind up tx and rx audio mods?
- Replies: 1
- Views: 516
Re: Cobra 29xlr vfo wind up tx and rx audio mods?
Looking at the schematic it looks like a wind-up isn't possible as the delta tune circuit is completely different from later 29s. What "might" work is putting a 100uf , 16 volt with the + going to the base of TR21 and the - going to board ground. RX: Change C29 and C90 to 1uF polyester or ...
- Wed Jul 13, 2022 1:12 pm
- Forum: rx and tx mods
- Topic: TX Frequency adjust pot on cbs1000
- Replies: 6
- Views: 460
Re: TX Frequency adjust pot on cbs1000
IC4 is the main 8 volt regulator. Q35 is the switching transistor that is controlled by the TX-Out of the main CPU. Q35 controls Q34 the 8 volt RX source and Q36 the 8 volt TX source. CBS1000 TX Switch Schematic.jpg I couldn't find IC4 or Q34 on the CBTricks board view but I did find Q35 and Q36 CBS...
- Sat May 07, 2022 4:59 pm
- Forum: rx and tx mods
- Topic: TX Frequency adjust pot on cbs1000
- Replies: 6
- Views: 460
Re: TX Frequency adjust pot on cbs1000
RV50 (RV5 on this pic) on the front board is the only clarifier adjuster. You sure that isn't the transmit adjuster? On the schematic it's fed by the 8V TX source.
- Wed Apr 27, 2022 9:00 pm
- Forum: rx and tx mods
- Topic: Hifi transmitting
- Replies: 3
- Views: 838
Re: Hifi transmitting
Finding one that's the same input and output impedance as the original would be difficult at best. As far as frequency response you could just inject one and try it. If low bass makes the audio choppy, just roll it off higher. I've injected a Tram D-201 and it handled bass down to 30Hz. Never tried ...
- Wed Apr 27, 2022 8:50 pm
- Forum: rx and tx mods
- Topic: yeasu ft-450D
- Replies: 1
- Views: 245
Re: yeasu ft-450D
Gimme a couple days to stare at the service manual.
- Sat Apr 23, 2022 8:47 am
- Forum: rx and tx mods
- Topic: Hifi transmitting
- Replies: 3
- Views: 838
Re: Hifi transmitting
You would inject through a .47uF. 250 volt to the grid end of:
C53 on the Mark 3
C220 on the Mark 4a
It can transmit semi-wide, limited on the low end by insufficient audio transformer core area.
C53 on the Mark 3
C220 on the Mark 4a
It can transmit semi-wide, limited on the low end by insufficient audio transformer core area.
- Sat Apr 23, 2022 8:36 am
- Forum: rx and tx mods
- Topic: Cobra 29xlr mosfet mod
- Replies: 1
- Views: 353
Re: Cobra 29xlr mosfet mod
I'm sure it can be done but I don't think CBTricks ever had any instructions for the XLR radios and I've never seen any threads on CB forums either.
- Mon Apr 11, 2022 5:41 pm
- Forum: rx and tx mods
- Topic: Galaxy 55 hp direct injection and hifi TX rx 3500 15c.board
- Replies: 4
- Views: 1391
Re: Galaxy 55 hp direct injection and hifi TX rx 3500 15c.board
Not sure which board a 4600 has.
- Sun Apr 10, 2022 12:31 pm
- Forum: rx and tx mods
- Topic: HiFI mod for Realistic TRC-452
- Replies: 0
- Views: 449
HiFI mod for Realistic TRC-452
Receive: Change C224, 229, 232 to a 2.2uF 16V or higher Electrolytic, observe polarity TX: Change C277 to a 2.2uF 16V or higher Electrolytic, observe polarity Change C278 to a 1uF, 16V or higher polyester, mylar of non-polarized electrolytic Change C282 to a 2.2uF 16V or higher Electrolytic, observ...
- Sat Apr 09, 2022 8:30 am
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
Great, at least we now know the mod is sound and the clarifier area on the CBTricks schematics are not correct. Chalk up another schematic anomaly to the many I've found over the years on Galaxy schematics...
Thanks for the info!
Thanks for the info!
- Fri Apr 01, 2022 8:31 am
- Forum: rx and tx mods
- Topic: AR3500
- Replies: 13
- Views: 642
Re: AR3500
I hifi'd one back in 2009 for a buddy. He didn't use rack gear so I just did the receive and TX through the mic jack. Sounded pretty deep with a 636 mic.
- Fri Mar 25, 2022 9:02 am
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
I have a lot going on for the next few weeks but I'll look up some of those odd-named radios and see what kind of info there is.
- Fri Mar 25, 2022 9:00 am
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
Yes, many radios are just rebranded Galaxy/Ranger radios (not these necessarily as Anytone are basically Galaxy tech but have more changes than other clones) . As such many of the hifi mods can just be extrapolated. One easy way to see which radio they are clones of is to see what part number the tw...
- Thu Mar 24, 2022 3:08 pm
- Forum: rx and tx mods
- Topic: Vfo wind up
- Replies: 35
- Views: 14246
Re: Vfo wind up
It's hard to tell because the schematic for the 77HML looks incomplete in the clarifier area. The "fine" clarifier pot is not shown and R141 is in the location of D38 on the 55HP schematic. D38 isn't shown on the 77HML schematic so trying to make sense of the CBTricks clarifier mod for the...
- Wed Mar 09, 2022 10:44 am
- Forum: rx and tx mods
- Topic: Kenwood TS440s request
- Replies: 4
- Views: 359
Re: Kenwood TS440s request
The only service manual I can get without paying money or getting malware/virus is a shitty 8.67MB file that's too blurry to interpret. If you have a way to get a cleaner copy, let me know. It's too bad the site manualslib.com decided to have malware on their website, they used to be one of the best...