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Cobra 148GTL Issue

naz007

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Hi all. I recently came by a tatty, very used Cobra 148GTL which needs some TLC (More than I expected sadly so I may just end up passing it on)
One weird thing is when I transmit on AM, my voice comes through the speaker. (like it would with talkback) Only on AM, not SSB.
Anyone got any ideas as to why this would happen? Thanks
 

WSAC829

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Back in the day when people were too cheap to buy an external talkback speaker they would solder a 100ohm resistor on the speaker ground pin and PA ground pin (top side of radio) to enable a "poor mans" talkback. I did this on my Ranger 696F, but i actually added a toggle switch to the back of the radio to turn it on and off. With that said, who knows what the previous owners did to that 148. You could open it up and look for anything obvious that was added. I pulled the image below from a random site, but it shows this mod. It may or may not be why your 148 talks back, but it's all i can think of.

resistor20in20place.jpg
 

naz007

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Back in the day when people were too cheap to buy an external talkback speaker they would solder a 100ohm resistor on the speaker ground pin and PA ground pin (top side of radio) to enable a "poor mans" talkback. I did this on my Ranger 696F, but i actually added a toggle switch to the back of the radio to turn it on and off. With that said, who knows what the previous owners did to that 148. You could open it up and look for anything obvious that was added. I pulled the image below from a random site, but it shows this mod. It may or may not be why your 148 talks back, but it's all i can think of.

View attachment 163205
Aha, there is something similar but not in the exact configuration as that. Here's a pic .......
 

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WSAC829

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Yeah, that could be it. Judging by the solder ball in the top left corner it looks to be added. Not every radio had the exact same placement of the resistor. If you have a soldering iron handy you could clip one end of that resistor (or unsolder one end) and see if that fixes it. If it does, then remove it. If not, reattach it.
 
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naz007

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Yeah, that could be it. Judging by the solder ball in the top left corner it looks to be added. Not every radio had the exact same placement of the resistor. If you have a soldering iron handy you could clip one end of that resistor (or unsolder one end) and see if that fixes it. If it does, then remove it. If not, reattach it.
Thanks !! It turns out that was indeed causing the problem . Well, I call it a problem but whoever did it that way saw it as something useful for whatever reason!!
 

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niceguy71

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I just found out Cobra stopped making Side Band radio's!!! last year you could get a brand new 148GTL and I think they were only $159 ... so it amazes me to see people use the old ones that people have played around with???... with a new one, you get a warranty, and you know what's happened to the radio from day one...... I guess now the old 148 GTL's will go through the roof on price......
believe it or not I sold my never used 1989 Cobra 148 GTL last summer for $400 bucks!.. it was a package deal I also sold him a small Texas Star amp for $235 so I got $635 ... I bought the AnyTone 5555 N II for $259.... so I got a better radio and more power than the old 148 and amp and pocketed $376 bucks.....
going to be interesting to see what the 148's sell for now
 

WSAC829

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so I got a better radio

Glad you got a pretty decent price on your old gear, but i wouldn't say you got a better radio. Sure the AT5555/66666/qt60/etc have more bells and whistles, but the old Cobras and Unidens were tough as nails and highly modifiable. Let me know if your 5555 still works in 30+ years. I doubt it will. Uniden originally made the main boards for cobra for years and years. They were thicker, and made with better components than the junk Cobra has been using for the last 15-20 years or so. Cobra dropped Uniden and went with cheaper chinese manufacturers. Eventually Uniden did the same also, but not right away. They were still made in the Philippines for quite a while after that. Not that that's a bad thing these days. It is a global economy after all. However i can see why somebody would want an old 148. They don't make radios like that any more. Heck, have you ever listened to channel 6, 11, and 28? Those guys always talk about their Cobra 2000's or Uniden Grant XL's. They know what's up. None of the big boys are using anything remotely new. These new computer controlled rigs are cool and all, but they will never out talk a radio from the 70's - early 90's. They also aren't easy to fix. Every component is micro mini and some parts are even glued over so they cant be tampered with. Radio's today are basically cheaper throw away rigs vs the old reliable and easily fixable/upgradable units.
 

niceguy71

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Glad you got a pretty decent price on your old gear, but i wouldn't say you got a better radio. Sure the AT5555/66666/qt60/etc have more bells and whistles, but the old Cobras and Unidens were tough as nails and highly modifiable. Let me know if your 5555 still works in 30+ years. I doubt it will. Uniden originally made the main boards for cobra for years and years. They were thicker, and made with better components than the junk Cobra has been using for the last 15-20 years or so. Cobra dropped Uniden and went with cheaper chinese manufacturers. Eventually Uniden did the same also, but not right away. They were still made in the Philippines for quite a while after that. Not that that's a bad thing these days. It is a global economy after all. However i can see why somebody would want an old 148. They don't make radios like that any more. Heck, have you ever listened to channel 6, 11, and 28? Those guys always talk about their Cobra 2000's or Uniden Grant XL's. They know what's up. None of the big boys are using anything remotely new. These new computer controlled rigs are cool and all, but they will never out talk a radio from the 70's - early 90's. They also aren't easy to fix. Every component is micro mini and some parts are even glued over so they cant be tampered with. Radio's today are basically cheaper throw away rigs vs the old reliable and easily fixable/upgradable units.
I agree today's radio's are throw aways.
I guess the 148 GTL was good, I hooked it up for two days before I listened to the guys here and got the Quad 5, I had a pretty hard time making any long rang skip with the 148... and without the noise reduction it was a little noisey..... the airwaves are filled with 60-90 watt export or ham radios... and I just couldn't get through them.... the Quad 5 with the noise reduction made that old 148 look 148 years old!

Quad 5 with weather channels, extra ham channels, FM, noise reduction, scan, I love seeing three BIG meters on display at once.... the SWR-- power output--and Signal Strength.. love that... love the buttons on the microphone too.

I love all the new stuff and power of the Quad 5, everyone say's it sounds incredible.... within the first month of having the Quad 5 I make contacts in Scotland, South Africa, Jamica, UK, ..... will it be here in 10 years? I doubt it, I hear the knobs on the Quad 5's and 6's only last a few years and fall off.. if they even last three years..... but by then they will have even better radio's out there to replace them and probably cheaper...... I'm also not a big fan of the menu on it....
I have a brand new Quad 5 sitting on my shelf waiting for me to pull my President Grant Export out of my pick-up truck and replace it...

I can just feel the knobs as I drive and know where everything is on the old Grant.... and surprisingly the output is pretty good on that old Grant too, I seem to get out very far and skip all over the country.... and maybe I'll regret selling my Grant when I get around to it.... but I bet it fetches $600 so I could get 3 Quad 5's with that. AliExpress is selling them for $180 bucks.. I just bought a few things from that company to see if they were a scam.... but I've gotten everything I ordered and at dirt cheap prices... so I'll stick with the new stuff

I guess everyone likes what they like.... I never regretted selling the Cobra...... but again I thought they would be making Cobra 148 GTL's forever!
I think I may miss my Grant that I've had for 35 years... but I know any day now the capacitors will start leaking and I want to get rid of it before that happens.

https://www.aliexpress.us/item/3256806704959061.html?src=google&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&gclsrc=aw.ds&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en3256806704959061&ds_e_product_merchant_id=5338008156&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=20536623837&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=Cj0KCQjwvb-zBhCmARIsAAfUI2vdClqUOLYvU0RA56YqPtRGELx0W0C2kj_lKxf5zzOjLVKPauy-I40aAhWsEALw_wcB&aff_fcid=c7749fd6d7084f2688c748aca2171e58-1718670234333-00051-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=c7749fd6d7084f2688c748aca2171e58-1718670234333-00051-UneMJZVf&terminal_id=5d97ba9470c94496bfa8114aa3862ab2&afSmartRedirect=y&gatewayAdapt=glo2usa
 

WSAC829

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That's fair. Don't get me wrong, I've recently purchased the anytone at500m II and radioddity cb500. For $90 they are a steal. They do everything the 5555/6666 etc do minus SSB which I don't care about. I find shooting skip on straight AM more rewarding. Sideband is cheating in my eyes. Lol.

I wouldn't worry about the caps in the Grant. Up until a few months ago I used my 1977 Montgomery Ward 702 base daily for the last 35 years. Still clean as a whistle inside. No signs of showing it's age. They just don't make em like they use to. I'm sure I could still keep using it daily until I'm 6 feet under without worry. Since you have a good old Grant from the 90's you could probably do the same.
 

slowmover

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That's fair. Don't get me wrong, I've recently purchased the anytone at500m II and radioddity cb500. For $90 they are a steal. They do everything the 5555/6666 etc do minus SSB which I don't care about. I find shooting skip on straight AM more rewarding. Sideband is cheating in my eyes. Lol.

I wouldn't worry about the caps in the Grant. Up until a few months ago I used my 1977 Montgomery Ward 702 base daily for the last 35 years. Still clean as a whistle inside. No signs of showing it's age. They just don't make em like they use to. I'm sure I could still keep using it daily until I'm 6 feet under without worry. Since you have a good old Grant from the 90's you could probably do the same.

You run it mobile 10-hrs day, 6-days week?

Some of them last, but the performance is flat worthless by comparison. They aren’t up to the task of today.

I’ve several that meet the descriptive nostalgia angle. They lack the ears and the clarity. Much as I may like them they don’t represent anything superior.

If we go that route it’s when CB radios were American-made. Like so much else, the financiers destroyed that along with Americans share in productive gains. Everyone took a 50% pay cut since the 1970s. Along with higher expenses. So of course that which was offshored was stagnant in design and increasingly cheapened in quality.

I like American cars circa 1965-1975. Know quite well how to operate and maintain as daily drivers. Think I can find quality, reliable parts any more?

There are limits.


I’m in favor of much that doesn’t need revision and can be repaired for fifty-plus years. Young couples would benefit. Just not the speculative financiers.

The ones who want a 148 or another iconic antique are welcome to them. At home, occasionally powered up. No longer capable of what’s needed on 75-MPH Interstates and in fast-changing weather conditions in a far noisier electronic environment.

NRC — and stable SSB — changed the game.

Forever.

.
 

WSAC829

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You run it mobile 10-hrs day, 6-days week?

Some of them last, but the performance is flat worthless by comparison. They aren’t up to the task of today.

I’ve several that meet the descriptive nostalgia angle. They lack the ears and the clarity. Much as I may like them they don’t represent anything superior.

I use to drive truck 12-14 hours a day 5 days a week, yes. Don't make this a power trip. Nobody is right or wrong here. Every persons use case is different. I quit driving truck in 1999 and i didn't need to hear weak stations in the weeds, nor did i ever want to. Most drivers, even 25 years ago have/had their squelch cranked. If you weren't within a mile or two of them they couldn't (or didn't want to) hear or talk to you anyway.

You've stated before multiple times, even old radios with a good dsp/nrc external speaker are good enough for "hearing". As for sideband, that is not fun or safe while driving. Same thing goes for all these new menu driven radios. Not safe to be fumbling around with menus and multiple buttons while on the road. You might as well be texting on your phone while driving at that point. Nothing beats visible knobs for quick adjustments.

Again, my use case is different than yours. My mobile now has the Uniden 885 for the scanner / bear tracker first and foremost. The cb portion of that radio is a bonus, and suits my basic needs while i'm on the road. I'm mainly on UHF or VHF anyway when mobile. At home i'm a heavy skip shooter. I don't care about the locals or the road conditions. I want to talk around the world on straight AM, and i do, all the time. My older radio's and obsolete linear amplifiers have been doing that just fine for decades. There's an old saying.... If it ain't broke, don't fix it.
 

slowmover

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1). The menu driven radios aren’t adjusted on-road.

— VOL, RF-G, SQ,
are handled same way as old radios so “menu” is non-factor.


2). NRC TX/RX gets you heard. “Pile-up buster” as AM-19 is just that when things get hairy.


3). U-885 still needs a KL-203 added to DSP speaker to equal a modern NRC export ($300+ total), maybe a power mic as well ($60 more). $400 atop $400 radio price versus $300 inclusive.

I already own these so “expense” isn’t a factor.


4). I’m going to dispute RX/TX distance as it’s pretty much become the most-important factor for highway driving.

We didn’t have 50-million plus sub-normal IQ drivers on the road in ‘99 that we do today. Just five years ago the roads weren’t as bad as now.

5). Distant Early Warning turned into just about the most important factor.
 

WSAC829

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1) There are more than just the 5555/6666/QT60 when it comes to the new menu driven radios. For instance i know of a few other rigs that have nothing more than a volume knob. Most everything else is menu driven. Examples: The AnyTone AT500M II. Radioddity CB500. Retevis MB1. QYT CB-27. Also a bunch of the President models (Andy/Thomas/Bill/etc volume knob only). These may not be your cup of tea, and they lack SSB, but they do exist, and people do buy them.

2) 400 watt linear attached to a tweaked and peaked old dinosaur of a CB with a d104m6b will blow the doors off anybody. You will be heard.

3) Not arguing the added expense if one so desires a DSP external speaker. I don't. I can hear what i need to just fine. However, tell me where you can get a NRC enabled CB with a built in $450+ p25 scanner with GPS for $300. You can't. Also no new radio comes with a power mic. So add that $60 on top your $300 "inclusive" radio, then buy a $450+ scanner on top of that. Now you're at $810+. Not much of a price difference in the end. So your example is moot.

4) I totally agree with this statement:
We didn’t have 50-million plus sub-normal IQ drivers on the road in ‘99 that we do today. Just five years ago the roads weren’t as bad as now.
I don't even like riding my motorcycle any more due to all the idiots on the road.
 

John_S

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The only mode that runs well on the antiques is AM. The minute you switch to SSB you'll see how stable the radio is. The QT60 I had was almost perfect right from a cold start...just a minor tweak on the VFO. I can only speak to that radio, but once you have the initial adjustments made, you really didn't need to go into the menu that much. Another drawback to antique radios is trying to get them fixed after popping transistors trying to make sure that your heard over everyone else. Good substitutes for finals and drivers are getting impossible to find...except for maybe the counterfeit ones from China. And PLL's...another scarcity. Not worth the effort.
 

slowmover

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2) 400 watt linear attached to a tweaked and peaked old dinosaur of a CB with a d104m6b will blow the doors off anybody. You will be heard.

Yes, one will TX right past 2/3-3/4 of those he can hear as more can hear me to whom I can respond with a modern radio & ideal antenna system.

I make fun of these clowns on a regular basis.
And none of them sound good in comparison.

“Loud”, isn't performance.

The match between TX & RX is what defines high performance. Ears take precedence.

Clarity
changed the game. The older radios love DSP on TX as one comes in well by comparison. Everyone quickly tires of an over-powered radio, especially when it’s on another road.


3) Not arguing the added expense if one so desires a DSP external speaker. I don't. I can hear what i need to just fine. However, tell me where you can get a NRC enabled CB with a built in $450+ p25 scanner with GPS for $300. You can't. Also no new radio comes with a power mic. So add that $60 on top your $300 "inclusive" radio, then buy a $450+ scanner on top of that. Now you're at $810+. Not much of a price difference in the end. So your example is moot.

Lack of experience is what says DSP in audio is optional. It’s vital the farther one gets out from city center and is increasing RF-G + reducing SQ.

Points made about U885 are worthy. Agreed.
But it’s best-suited to that inner loop of a major city. And otherwise by population density. It’s not what’s wanted far from the major metro regions without DSP or a KL203. A ProComm N/C power mic is easiest to add for punch.

But Power Mic not needed or wanted with a Q5/QT60. I tested my usual 12-mics and found the only substitute was a U-BC645 as electret is what shines. With G2 it’s the Digi-Mic recommendation seen (same as with Lincoln).

— If one wants to tout the scanner portion of U885, then add in the cost of a laptop plus applicable software. Your insights made that a goal of mine, now. Scanner adds to decision-data if both antenna systems made “best” and DSP employed.

Something I always like to mention with Uniden & President is to have the respective cordless speaker/mic at hand, charged and ready to use. A superior optional feature.


I don't even like riding my motorcycle any more due to all the idiots on the road.


I actually wrote a much longer post that didn’t make it. There’s depth to the subject of what the roads are like nationwide which is wholly ignored as most never see enough for the patterns to form. These certainly aren’t reported.

Details make clear the scope & severity once one knows for what to look.

We’ve the same intent.

.
 
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WSAC829

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The only mode that runs well on the antiques is AM. The minute you switch to SSB you'll see how stable the radio is. The QT60 I had was almost perfect right from a cold start
I'm sure SSB is much better/easier on these new rigs, but as you may have read earlier, i find SSB boring/cheating. Most of the radios i own don't have SSB because i bought them specifically for not having it. Never cared for it on any band. For those who live and die on SSB that's great to hear though.

Another drawback to antique radios is trying to get them fixed after popping transistors trying to make sure that your heard over everyone else.
That's not going to happen on my end. Anybody who runs some "heat" should know to tone the radio down. I drop all my antique radios down to a 1.5 or 2 watt dead key. Now the golden screwdriver guys who crank everything up... sure, but i'm not one of those guys. I let the amp do the work, not the radio.

Good substitutes for finals and drivers are getting impossible to find...except for maybe the counterfeit ones from China
What do you think is used in these new Chinese made radios? ;)

Yea,, plus and minus 6 channels
Yeah, probably. If ya can't beat 'em, join 'em right?

A ProComm N/C power mic is easiest to add for punch.
I actually picked up a Workman DM-1000 power/echo mic for the 885. It woke up the audio quite a bit and sounds fairly decent. Today USPS dropped off the ProComm PSM6PM power mic i ordered for my AnyTone AT500M II. After watching some YT reviews of it, i was impressed. Sounds slightly better than a D104. It actually sounds really good on the 885, but that's not the rig i bought it for. Lol.

I actually wrote a much longer post that didn’t make it.
I kind of wish it would have. I like the chit-chat/banter. You know, like the old CB days.
 
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