Search found 58 matches

by 31
Mon Nov 21, 2016 6:01 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Back swing issue
Replies: 27
Views: 8199

Re: Back swing issue

Even though you're direct injecting, you're still going through the modulator and have to deal with setting the deadkey via VR10. Might not be the case but also an idea. Seems like a nice schematic ...any chance of getting a copy of that one? Thanks I'm confused? The schematic is in the post. Are w...
by 31
Tue Oct 11, 2016 10:23 pm
Forum: rx and tx mods
Topic: Madison 8719
Replies: 3
Views: 2152

Re: Madison 8719

Not the best but something I pieced together from the forum over at cbtricks . There is also some differences and I found the 2000/148 schematic to be a little closer to the the Madison's I was working on.
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by 31
Tue Oct 11, 2016 10:16 pm
Forum: rx and tx mods
Topic: Madison 8719
Replies: 3
Views: 2152

Re: Madison 8719

Red light , I've modded both 2000/148 and Madison's . Both flip clock and digital ones. They are all the same , if you're looking at changing the 455khz IF filter, it's all the same one. These radios sound super good once modded. The alignment will make or break the receiver. I can't remember of han...
by 31
Mon Jun 27, 2016 3:58 am
Forum: Microphones & Mic Wiring
Topic: D104/desktop preamp mods pt 1
Replies: 5
Views: 2133

Re: D104/desktop preamp mods pt 1

In part 2 I will be using this circuit by N1HFX ,with the exception of removing the input cap and increasing the gate resistor to 10-15 Meg. The D104 element likes impedance over 10 Meg. May also play with the coupling cap values. What they say, the more the merrier or how about a play on that 80's ...
by 31
Mon Jun 27, 2016 3:29 am
Forum: Microphones & Mic Wiring
Topic: D104/desktop preamp mods pt 1
Replies: 5
Views: 2133

Re: D104/desktop preamp mods pt 1

RB Goldfinger, update #1. The circuit I followed was based on N9WB's Fet Preamp. http://www.qsl.net/hcara/D-104.htm In his arrangement, the JFET is configured in a common drain setup. Everything has advantages and disadvantages. Electronic theory says that this arrangement is setup for current gain....
by 31
Sat Jun 25, 2016 10:00 am
Forum: Microphones & Mic Wiring
Topic: D104/desktop preamp mods pt 1
Replies: 5
Views: 2133

Re: D104/desktop preamp mods pt 1

D104 desktop 2x2n3904
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575m6
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D104m6 2n5484
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http://www.qsl.net/hcara/D-104.htm
by 31
Sat Jun 25, 2016 9:33 am
Forum: Microphones & Mic Wiring
Topic: D104/desktop preamp mods pt 1
Replies: 5
Views: 2133

D104/desktop preamp mods pt 1

In the process of doing projects on my bucket list. The desk top D104 were built with or without preamps in the base. I been wanting to try 3 or 4 different circuits floating around on each. The preamp in the model I have is a 2 stage NPN preamp. The difference between the desktop and the newer hand...
by 31
Sun May 15, 2016 6:09 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: 2-meter?
Replies: 2
Views: 1863

Re: 2-meter?

Anything can be done, look at the schematic and caps in the audio line to the mic preamp or direct inject based on the mode of operation. Bandwidth limiting is normally done in the way of caps from the mic to the preamp. Depending on mode i.e. AM, FM
by 31
Fri Jan 29, 2016 5:59 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Back swing issue
Replies: 27
Views: 8199

Re: Back swing issue

That's understandable , I can see where the extra stage could add distortion. Would a hotter opamp be a better replacement then the 945? Anyhow this has side tracked a little from the OP. Nice gate by the way, never hear much injected radios in action. 31: The Galaxy/Ranger has a 3 transistor Darlin...
by 31
Fri Jan 29, 2016 1:17 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Back swing issue
Replies: 27
Views: 8199

Re: Back swing issue

GF: I'm tracking what you are saying. Early on in my career in the Navy I would catch myself trying to reverse engineer circuits to be able to troubleshoot more effectively. That was a mistake, I'd find myself deep in the tech manuals and pages and pages of schematics only to find myself more confus...
by 31
Fri Jan 29, 2016 11:04 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Back swing issue
Replies: 27
Views: 8199

Re: Back swing issue

A few ways to look at this, the stock mic plugs in through the front and needs to be amplified to bring it up to line level needed to drive the darlington. I've seen rack gear pump out big signals and some small. I can't remember off hand what the stock signal is crossing c174 but that's the same dr...
by 31
Thu Jan 28, 2016 6:01 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Back swing issue
Replies: 27
Views: 8199

Re: Back swing issue

Even though you're direct injecting, you're still going through the modulator and have to deal with setting the deadkey via VR10. Might not be the case but also an idea.
by 31
Thu Dec 24, 2015 11:24 am
Forum: rx and tx mods
Topic: Browning Mark 3 Receiver
Replies: 9
Views: 3891

Was going to post that exact screen shot but for some reason I can't do it from my IPhone. Studying some of Timtron work on some of the boat anchor radios, there much more that can be done but much beyond the scope of the basic cap mods. Values seem close to being optimal. As with older gear caps be...
by 31
Tue Dec 22, 2015 1:13 pm
Forum: rx and tx mods
Topic: Browning Mark 3 Receiver
Replies: 9
Views: 3891

I don't have any experience with any Brownings or tube radios but seems to be the logic mod is C62 and C65 .001 uF to something bigger non polarized.
by 31
Fri Jan 16, 2015 1:33 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: NEED DIRECT INJECTION HELP PLEASE
Replies: 12
Views: 4344

Sure thing, no problems here. Goldfinger taught me one of thee (the) greatest tips ever, I mean ever. Extrapolation. Once I figured out the meaning of that , the world opened up, like the parting of the Red Sea. Also its been pretty dead around here, so why not add some life back.
by 31
Thu Jan 15, 2015 3:35 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: NEED DIRECT INJECTION HELP PLEASE
Replies: 12
Views: 4344

Re: 31

Gonna try it out this weekend, before I do, quick check so I don't back feed my circuit. I lift the leg if cap to inject then put cap on toggle. That what I was thinking, correct me if I am wrong please. thanks 31 The place where I put the red dot is the lead of the capacitor that you want to leave...
by 31
Wed Jan 14, 2015 10:34 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: NEED DIRECT INJECTION HELP PLEASE
Replies: 12
Views: 4344

I'm feeling like being in a giving mood. So here goes. C174 attach positive side of electrolytic to the hole with red dot in attached pics for the 2000. Same thing for C235 for the 2547. Hope that helps. As for driving the modulator/regulator, you'll need more drive for the 2000 from your rack. What...
by 31
Thu Jul 09, 2009 5:44 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: opening up a Road Devil Mic
Replies: 1
Views: 591

opening up a Road Devil Mic

Can I change some caps in this mic for more Low end? Thanks 31


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by 31
Sun Jul 05, 2009 6:23 pm
Forum: CB WATERGATES : <<< The Watergate's rolling on WWPDX.com!
Topic: Prime and Mod Squad
Replies: 4
Views: 687

I got those favorited in my videogate account. He had my meter stuck in the wall. He was hitting me with the same db's Mod Squad was, unbelievable
by 31
Sun Jul 05, 2009 2:46 am
Forum: CB WATERGATES : <<< The Watergate's rolling on WWPDX.com!
Topic: Prime and Mod Squad
Replies: 4
Views: 687

I tried to get in but Squad had it locked down. I can't wait to hear Primes gate, his is line level so it'll sound a lot cleaner.
by 31
Thu Jun 25, 2009 1:50 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Opening up the receive on a 959
Replies: 12
Views: 2058

I am still waiting on my reply from Goldfinger on my proposal for receiver audio mods on a Galaxy 44 , should be the same RX section on all if not most Galaxy's. This is just my proposal so don't take it as the correct mods until validated by some know how. The first 2 use ceramic or Mica/Mylar and ...
by 31
Mon Mar 23, 2009 1:18 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Modifying Uniden Grant XL - Setting up for High Fidelity????
Replies: 4
Views: 1132

I am like you in a quest for high fidelity and this is what I know so far. Behringer's line of audio gear seams to be fairly inexpensive and is tolerant of RF type equipment/environment. I purchased a W2IHY dual band EQ which comes with a built in noise gate and a compressor which is really nice. Th...
by 31
Wed Dec 10, 2008 3:11 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Make an Ibox?
Replies: 4
Views: 1083

I was going to use it for my cobra 29 , 2950 , Kris 23+ adn Whiteface Johnson. I not real sure which one I 'm staying with but either way I will need some kind of adapter to go from rack gear and a PTT button to key the radio.
by 31
Wed Dec 10, 2008 12:30 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Make an Ibox?
Replies: 4
Views: 1083

Make an Ibox?

What is invovled in converting a 600 ohm high impedance studio mic audio down to low level cb audio to be inserted into your radio? The W2IHY Ibox looks easy to make but I don't have one to disect. Not the best drawing but its the only way I know how to explain myself. If I was to use a stock cb mic...
by 31
Sun Sep 28, 2008 5:42 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: What mods?
Replies: 9
Views: 1744

Cool , I was trying to disect the Grants cap changes and came up with move the decimal value up one higher place and you got BASS. ex .0047uf to .047uf
by 31
Sun Sep 28, 2008 12:02 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: What mods?
Replies: 9
Views: 1744

What mods did you do to the 29? Cap changes? I like the audio and wish I could get that lowend on all my radios. My Grant sounds good but need my 29 and 2950 to sound like yours.
by 31
Sat Sep 06, 2008 3:24 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: 148/Grant Audio
Replies: 7
Views: 1932

148/Grant Audio

I would like to widen the bandwidth of my Grant to get that warm sounding audio like the Tube radios.I know there are cap changes along with some resistor changes but I do not care about extra power , I just want some broadcast sounding audio with the least amount of audio rack gear if any.

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