Search found 50 matches

by 31
Mon Apr 16, 2018 5:04 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Browning Golden Eagle Mark 3
Replies: 6
Views: 840

Re: Browning Golden Eagle Mark 3

Too busy at work and dont have the time to confirm or look at a schematic so take this with a teaspoon of precaution. Also a link to the source. GF delete if not OK Mark IV, IVA and Mark III HiFi mod/ direct inject. Saw this posted else ware. I can not confirm this was successful nor have I ever per...
by 31
Wed Mar 07, 2018 12:07 pm
Forum: rx and tx mods
Topic: Cobra 29 AMC & Hifi
Replies: 4
Views: 341

Re: Cobra 29 AMC & Hifi

I run the JP36 swing mod on all transformer modulated radios, to control the deadkey a little better. Even on Direct injected stuff. You can do JP36 mod on the new Surface mount Unidens also. I did an 880 that way with a W2IHY.
by 31
Mon Feb 12, 2018 8:48 am
Forum: rx and tx mods
Topic: Galaxy 900 series radios 919 through 979
Replies: 8
Views: 3711

Re: Galaxy 900 series radios 919 through 979

Removes caps or decrease in value. The values are listed
by 31
Thu Jul 27, 2017 7:37 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Console V
Replies: 5
Views: 424

Re: Console V

Looks simple, I'll let the man do his thing. I'm a spectator now days . Good luck dude.
by 31
Thu Jul 20, 2017 11:57 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Galaxy DX 2527 (EPT295013Z) Direct Injection Help
Replies: 38
Views: 1257

Re: Galaxy DX 2527 (EPT295013Z) Direct Injection Help

Guess I need to step to the side from now on. My work here is done. Aloha
by 31
Thu Jul 20, 2017 6:43 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Galaxy DX 2527 (EPT295013Z) Direct Injection Help
Replies: 38
Views: 1257

Re: Galaxy DX 2527 (EPT295013Z) Direct Injection Help

Nope, when you direct inject, you bypass the echo board and the mic preamp.
by 31
Wed Jul 19, 2017 9:28 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: Galaxy DX 2527 (EPT295013Z) Direct Injection Help
Replies: 38
Views: 1257

Re: Galaxy DX 2527 (EPT295013Z) Direct Injection Help

C299 is a non polarized capacitor, lift the star side and tie your line level audio there.
by 31
Sun Jun 11, 2017 4:06 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

Most parametric Eqs have all those adjustable features but at the core of the adjustment its center frequency, Q(width of adjustment) and boost or cut. By looking at the 1002 or whatever the model was. Each band had a fixed Q , fixed center frequency and only boost or cut is adjustable really is mor...
by 31
Fri Jun 09, 2017 1:52 pm
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

Not to step on toes but isn't it a parametric with a fixed Q? Not adjustable like you normally see.
by 31
Sun Apr 09, 2017 8:05 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

One more thing , on the audio rack . If you've ever listened to MMM over ther years I think he's adjusted his audio to fit into both stock and widened radios range. You can still sound decent within the parameters of the the stock. Andwidth, however some clever EQing does a world of difference.
by 31
Sun Apr 09, 2017 8:02 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

Some radios have a wider response as is there filtering values. Even though most of the Ranger and Galaxy's are built of the same design, little value changes here and there are the difference in sounds that you here. A General Lee can sound like a screamer but adjust the values to a 44V and get the...
by 31
Sat Apr 08, 2017 6:38 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

On my borrowed bench I don't have a PC close as I would also run it to a sound card. However I also use a second radio widened with no antenna as a monitor of my audio. MMM sampler is more for a scope pickup. There are other sampler circuits that does both . Scope pickup and a detector to listen to ...
by 31
Sat Apr 01, 2017 7:50 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

As far as compressors , they're all pretty decent . For cb or Ham , I wouldn't spend more then $100 for something. The thing you want to look for is RF immunity or rather better yet, ones that work well in that environment. When you look at what's available for cb/ham, one of the first names that co...
by 31
Fri Mar 31, 2017 1:20 am
Forum: >>> HIGH FIDELITY AUDIO Q and A <<< POST QUESTIONS AND COMMENTS HERE!
Topic: HI fi 148gtl
Replies: 26
Views: 4063

Re: HI fi 148gtl

What you hav is good, a graphic EQ is probably the easiest way to tailor the tone of your audio. You can individually adjust a particular frequency to your liking. Parametric EQs are a little more challenging if you're not that familiar with the process. It'll EQ in chunks. You can set it to pass or...
by 31
Sat Mar 25, 2017 3:56 pm
Forum: rx and tx mods
Topic: President Lincoln IF filter
Replies: 2
Views: 928

Re: President Lincoln IF filter

Cool thanks! I've done the mod before , just not on a Lincoln . Reading the service manual , I don't get why the AM detection wouldn't come after the 2nd IF at 455khz but I guess they like the single conversion better ? I'll change the 455 kHz anyways and see if it does any better for the AM.
by 31
Sat Mar 25, 2017 6:35 am
Forum: rx and tx mods
Topic: President Lincoln IF filter
Replies: 2
Views: 928

President Lincoln IF filter

GF, I'm aware of all the cap changes to help in the audio response. I know most hardcore DXers will try to increase selectivity by narrowing the IF filter. Looking at the schematic, the 455Khz 2nd IF is only used for SSB. Am I wrong at thinking the AM is only limited in bandwidth by the 10.695 Mhz F...
by 31
Tue Mar 14, 2017 5:36 am
Forum: rx and tx mods
Topic: Recieve mod
Replies: 10
Views: 1577

Re: Recieve mod

No worries bro, I never take any comments to heart, this is all for fun and experimenting. It works but I can't explain why, it really is confusing. Why would something that deals with frequencies and go-no go situations, increase to volume of receive? Strange but it works.
by 31
Sun Mar 12, 2017 6:15 pm
Forum: rx and tx mods
Topic: Recieve mod
Replies: 10
Views: 1577

Re: Recieve mod

GF, I did that mod way before I knew what circuits did what. I haven't thought about it till now. Looking at the circuit now makes no sense as to how and why it works. According to something I found online , pin 14 is the reference oscillators buffered output. As I said earlier, the mod just raised ...
by 31
Fri Mar 10, 2017 8:34 pm
Forum: rx and tx mods
Topic: Recieve mod
Replies: 10
Views: 1577

Re: Recieve mod

Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. Install a 22k-220k ohm resistor between these two points. The smaller the value, the more the receive is boosted. Use CARE when soldering to the PLL chip! If desired, this mod may be wired through a switch. From many si...
by 31
Fri Mar 10, 2017 8:24 pm
Forum: rx and tx mods
Topic: Recieve mod
Replies: 10
Views: 1577

Re: Recieve mod

Yes there is, I need a few to find it, brb
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: 2706

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: 900

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: 900

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: 54

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: 54

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: 54

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: 54

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: 821

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

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