Search found 684 matches
- Sat Feb 13, 2016 4:05 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Mod. limiter
- Replies: 10
- Views: 3294
Re: Mod. limiter
Not much. C102 is a feedback cap that affects frequency response. I tried many values when I was experimenting and 910 gave the best balance with regular CB mics. Using 1000 pf (.001uF) won't change it much. As with any mod I post, values are "suggested" and can always be changed for exper...
- Thu Feb 11, 2016 11:10 pm
- Forum: rx and tx mods
- Topic: Astatic D-104 bass mod TUG-8, TUG-9
- Replies: 3
- Views: 4261
Astatic D-104 bass mod TUG-8, TUG-9
Here is a quick and easy way to make an amplified D-104 have great low end.
Change the .01uF on the left and the .1uF in the middle to .22uF, 16 volt or higher ceramic disc or mylar.
Change the .01uF on the left and the .1uF in the middle to .22uF, 16 volt or higher ceramic disc or mylar.
- Thu Feb 11, 2016 11:07 pm
- Forum: Microphones & Mic Wiring
- Topic: Astatic D-104 hi-fi bass mod TUG-8, TUG-9
- Replies: 1
- Views: 1464
Astatic D-104 hi-fi bass mod TUG-8, TUG-9
Here is a quick and easy way to make an amplified D-104 have great low end. https://i.imgur.com/jSos93G.jpg Change the .01uF on the left and the .1uF in the middle to .22uF, 16 volt or higher ceramic disc or mylar. Here is the physical locations. Where the 2 red caps are is where the .22uF caps go: ...
- Thu Feb 11, 2016 11:01 pm
- Forum: Microphones & Mic Wiring
- Topic: D104 Silver and Night K-Eagle hi-fi bass mod
- Replies: 1
- Views: 1626
D104 Silver and Night K-Eagle hi-fi bass mod
Change C6 and C9 to: 2 - 1uF, 16 volt Tantalums wired in series with the negatives tied together, for a total of .5uF at 32 volts non-polarized
Change C8 to a 10uF at 25 volt Tantalum, observe polarity
Click Here For Full Size
Change C8 to a 10uF at 25 volt Tantalum, observe polarity
Click Here For Full Size
- Wed Feb 10, 2016 5:49 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Mod. limiter
- Replies: 10
- Views: 3294
Re: Mod. limiter
Looking at your graph, I'm not seeing the low end falling off at all so I'm not sure what you are getting at. If anything, the 2000 is responding lower. The 2000 and Washington have completely different transmitter chains so you can't expect them to respond the same. There isn't anything "wrong...
- Wed Feb 10, 2016 1:21 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Mod. limiter
- Replies: 10
- Views: 3294
Re: Mod. limiter
Need more info.
What is the green line? Where are you inserting the audio? Which mods did you do?
To me, the red graphs don't look very different.
What is the green line? Where are you inserting the audio? Which mods did you do?
To me, the red graphs don't look very different.
- Sat Feb 06, 2016 9:57 am
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Robyn T240-D
- Replies: 2
- Views: 1449
Re: Robyn T240-D
Inject through a .1uF, 250V to pin 2 of V5b where C511 feeds the tube. You will also have to change C601 to a .1uF, 250 volt. One problem I see with direct injecting this radio is that the transmit/receive switching is rudimentary which will allow the injected audio to be heard through the speaker i...
- Sun Jan 31, 2016 3:11 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: opening up the Uniden/President Washington audio
- Replies: 23
- Views: 4694
Re: opening up the Uniden/President Washington audio
Yes, metalized, polypropylene, monolithic, pretty much any non-polarized cap of at least 25 volts or higher is fine.
C119 is just the last cap in the transmit audio chain, It needs to be higher in value also to pass the bass.
C119 is just the last cap in the transmit audio chain, It needs to be higher in value also to pass the bass.
- Sun Jan 31, 2016 2:32 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Back swing issue
- Replies: 27
- Views: 8212
Re: Back swing issue
Great terminator, glad to hear.
- Sat Jan 30, 2016 1:29 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: opening up the Uniden/President Washington audio
- Replies: 23
- Views: 4694
Re: opening up the Uniden/President Washington audio
Receive: C91, C28, C108, C110 - change to 2.2uF mylar, polyester or non-polarized electrolytic C25 - make smaller in value for more highs Receive and transmit: C111 - make smaller in value for more highs. This cap affects both receive and transmit. If you make it smaller for more transmit highs, yo...
- Sat Jan 30, 2016 1:20 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: opening up the Uniden/President Washington audio
- Replies: 23
- Views: 4694
Re: opening up the Uniden/President Washington audio
No, just the transmitredlght wrote: Is that the whole rx/tx audio mod for an 8719 washington?
- Fri Jan 29, 2016 2:13 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Back swing issue
- Replies: 27
- Views: 8212
Re: Back swing issue
31: The Galaxy/Ranger has a 3 transistor Darlington trio. The Cobra modulator is a 2 transistor Darlington pair. The gain is much higher on the Galaxy version and is why it needs so much less signal to fully modulate. One problem that arises in any Darlington stage is distortion. The more transisto...
- Fri Jan 29, 2016 11:34 am
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Back swing issue
- Replies: 27
- Views: 8212
Re: Back swing issue
31: the signal across C174 is speaker level as it is what is coming out of the 5.8 watt audio chip. It's several volts peak to peak. Line level isn't enough to modulate fully. TR21 is just a transmit switch. Injecting here drives the audio chip directly. All of the mic preamp chain is bypassed. The...
- Thu Jan 28, 2016 6:06 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Back swing issue
- Replies: 27
- Views: 8212
Re: Back swing issue
One problem with injecting at C174 is it takes a few watts of audio to drive the modulator sufficiently. Line level from rack gear or a sound card isn't enough. Because of this you either have to use a small audio amp between the line level source and the injection point or inject before the 2000's ...
- Wed Jan 27, 2016 10:49 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: Back swing issue
- Replies: 27
- Views: 8212
Re: Back swing issue
Are you injecting at C174?
- Thu Jan 14, 2016 8:58 pm
- Forum: rx and tx mods
- Topic: Uniden PC-122, PC-122XL
- Replies: 7
- Views: 4300
Uniden PC-122, PC-122XL
Transmit: C111, C166: Change to 2.2uF mylar, polyester or non-polarized electrolytic Receive: C24, C27: Change to 2.2uF mylar, polyester or non-polarized electrolytic C26: make smaller for more highs C170: Change to 2.2uF, 25 volt electrolytic, observe polarity C123: Change to a 1000uF, 16 volt ele...
- Mon Jan 11, 2016 4:48 pm
- Forum: rx and tx mods
- Topic: Uniden Pro 710E
- Replies: 3
- Views: 2135
Transmit: C85, C52: Change to a 1 or 2.2uF, 25 volt or higher mylar, polyester or non-polarized electrolytic Receive: C23, C25, C54: Change to a 1 or 2.2uF, 25 volt or higher mylar, polyester or non-polarized electrolytic Receive and Transmit: C51: Change to a 1 or 2.2uF, 25 volt or higher mylar, p...
- Wed Dec 30, 2015 11:38 am
- Forum: rx and tx mods
- Topic: Browning Mark 3 Receiver
- Replies: 9
- Views: 3891
- Mon Dec 28, 2015 10:17 pm
- Forum: rx and tx mods
- Topic: Browning Mark 3 Receiver
- Replies: 9
- Views: 3891
- Mon Dec 28, 2015 8:58 am
- Forum: rx and tx mods
- Topic: Location of C170 on newer model 29
- Replies: 5
- Views: 3383
- Sun Dec 27, 2015 9:34 pm
- Forum: rx and tx mods
- Topic: TRC-459 hi fi mod
- Replies: 0
- Views: 5239
TRC-459 hi fi mod
Change all to 1uF-25 volt or higher non-polarized electrolytic, mylar or polyester Rec: C92 C95 C152 C153 C155 C157 Trans: C136 C140 C148 C155 Direct Inject: C148 at R180 end --------------------------------------------------------------------- TRC-459 21-1582 bass mod, wide audio, hifi, hi-fi, hi f...
- Wed Dec 23, 2015 12:56 pm
- Forum: rx and tx mods
- Topic: Browning Mark 3 Receiver
- Replies: 9
- Views: 3891
- Sat Dec 05, 2015 1:11 am
- Forum: rx and tx mods
- Topic: rci 2970n2
- Replies: 14
- Views: 4153
- Mon Nov 30, 2015 10:05 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: hifi rci 2980wx
- Replies: 6
- Views: 2612
- Sat Nov 28, 2015 1:25 am
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: hifi rci 2980wx
- Replies: 6
- Views: 2612
- Mon Nov 23, 2015 8:46 pm
- Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
- Topic: hifi rci 2980wx
- Replies: 6
- Views: 2612
- Sun Nov 15, 2015 10:39 pm
- Forum: rx and tx mods
- Topic: Location of C170 on newer model 29
- Replies: 5
- Views: 3383
- Fri Nov 13, 2015 11:18 pm
- Forum: rx and tx mods
- Topic: Location of C170 on newer model 29
- Replies: 5
- Views: 3383
Yeah, Imageshack turned sucky. I replaced it with a new image hosting site, check it now.
http://www.wwpdx.com/ForumWWPDX/viewtopic.php?t=12574
http://www.wwpdx.com/ForumWWPDX/viewtopic.php?t=12574
- Tue Oct 13, 2015 9:12 am
- Forum: rx and tx mods
- Topic: magnum delta force
- Replies: 6
- Views: 3255
- Mon Aug 31, 2015 9:08 pm
- Forum: rx and tx mods
- Topic: Galaxy 77/88/99/Melaka etc.
- Replies: 10
- Views: 7265