Believe it or not the stock kw antennas checked in at a flat 1 swr on 27.205 so they'll get me by until I get some upgrades. I ran cophase on the previous t800 with 4' Francis for 7 years that I drove that truck and I was impressed. Had great rx and tx alike although many told me it would never work. Now on this one the whole set up is different so I'll have to experiment. I know I tx much further than I can rx I've found that out. I'm thinking a pair of browning br-28 antennas, I've read great reviews on them and especially in this same truck. It's just making time to work on it without sacrificing too much time with my family when the truck is parked.Back to serious: What antennas?
Are those Garanimal color coaded? Matching socks and balls?View attachment 35626
Not only does he change socks daily, the corona balls get updated each morning.
.
Believe it or not the stock kw antennas checked in at a flat 1 swr on 27.205 so they'll get me by until I get some upgrades. I ran cophase on the previous t800 with 4' Francis for 7 years that I drove that truck and I was impressed. Had great rx and tx alike although many told me it would never work. Now on this one the whole set up is different so I'll have to experiment. I know I tx much further than I can rx I've found that out. I'm thinking a pair of browning br-28 antennas, I've read great reviews on them and especially in this same truck. It's just making time to work on it without sacrificing too much time with my family when the truck is parked.
Okay, I asked about your opinion on a thread (“In Search of . . “)
the
Palomar SL-41 Electret Microphone
and — as not everyone has one —
it wasn’t an improvement over the stock piece for this radio?
I was reading the review on the Euro distributor Avera-Distributing website this morning that made it sound “comparable” to both Astatic powered mikes
Review is titled, Testing the Palomar SL-41.
.
But I do have intentions of getting out the sl41 and eventually trying it on the president after I get all the other bugs worked out. Right now I suddenly developed an swr issue out of nowhere.... I went years driving t800's with no swr issues at all and the 880 doesn't play well. Pulled the antennas and mounts Friday night to clean them all up and check for any shorts. I'll be putting them back on in the morning and see what results areOkay, I asked about your opinion on a thread (“In Search of . . “)
the
Palomar SL-41 Electret Microphone
and — as not everyone has one —
it wasn’t an improvement over the stock piece for this radio?
I was reading the review on the Euro distributor Avera-Distributing website this morning that made it sound “comparable” to both Astatic powered mikes
Review is titled, Testing the Palomar SL-41.
.
For those whom may need to know...
View attachment 35171
Hope this clears up the Modulation Secrets that radio USED to have...
View attachment 35172
The mod is what @NZ8N was talking about - but one thing we all missed...
Recognize this...schematically...
View attachment 35589
The Red circled item is the "lag resistor"
The Richard has something similar...
It was a throwback to the old days - in the Grant and 148's there was a 1Meg resistor used in the Limiter circuit that helped (if that is the word) keep the Limiter from staying on all the time. But it worked In a coupling stage area that was NPN to PNP - so you really just couldn't tailor R127 to meet the needs of how Hot or Cold the limiter was...R131 is what others usually took out to affect on AM side, R127 affected both SSB and AM limiter actions.
R339 is a 1Meg, a 105 on the chip itself...that is the main one you have to change to obtain better gain and AMC action.
The problems are
D300 - you can't remove it, but NZ8N's dropping resistor - is needed right where it stands - but - you have the power flow arriving from the Stage just ahead of the Limiter - which can put a lot of current thru the part and with the shunt installed at the limiter - it can fail and you may or may not be able to talk again because the limiter got cooked at the same time. That was one of the main quirks about the repair - we have had only one return but the Boss kept us in the loop and warned us about the Q313 Solder Blob problem as he called it.
So to reduce that current - if you use the 1K - it will not hold up well - but if you use TWO of them - it will - you use the 1K (just one) at NZ8N mod spot, and place 1K over the top of the 1 Meg resistor (105 R339) just line it right up top of the 1 Meg and tack solder both sides. You don't anything else. You've brought the limiter action down and you even have some limiter action still but allows you to attain 80+ watts (as shown on MFJ meter in Smokin Joe's shop...) if the thing can really attain it.
The D300 is a fail-safe device - one-way valve - but the Q313 and EDIT (308) Q312 (Limiter) clamp so hard - its' for that reason so it (the Fail safe) doesn't engage that fail-safe mode, the radio can go into that mode if it gets too hot or shutdown - but you didn't hear this from me ok? I get yelled at otherwise...
Well with time on my hands and hopefully feeling up to it in another days or two, I'm feeling brave enough to venture off into this once again!I am not a proponent of removing or disabling the AMC circuit, as that is the leading reason there is so much hash, trash, splash and bleed over on the air.
'Twere me, I would modify the timing so it releases faster, such as this:View attachment 35201
Adding a 4.7k (to 1k) from the base of Q313 to ground (Emitter leg) will (should) increase the release speed and decrease the "hold time" of the circuit.
View attachment 35202
Adding a resistor between the red circles (trace for the Base of Q313) to the green circle (Ground trace), (if you have a chip resistor), or if you use a non Surface Mount resistor, the red circles on one side of the resistor to any part of the large green trace above that, after scraping the green coating away to expose the copper trace underneath, should do the job.
The mod is what @NZ8N was talking about - but one thing we all missed...
Recognize this...schematically...
View attachment 35589
The Red circled item is the "lag resistor"
The Richard has something similar...
It was a throwback to the old days - in the Grant and 148's there was a 1Meg resistor used in the Limiter circuit that helped (if that is the word) keep the Limiter from staying on all the time. But it worked In a coupling stage area that was NPN to PNP - so you really just couldn't tailor R127 to meet the needs of how Hot or Cold the limiter was...R131 is what others usually took out to affect on AM side, R127 affected both SSB and AM limiter actions.
R339 is a 1Meg, a 105 on the chip itself...that is the main one you have to change to obtain better gain and AMC action.
The problems are
D300 - you can't remove it, but NZ8N's dropping resistor - is needed right where it stands - but - you have the power flow arriving from the Stage just ahead of the Limiter - which can put a lot of current thru the part and with the shunt installed at the limiter - it can fail and you may or may not be able to talk again because the limiter got cooked at the same time. That was one of the main quirks about the repair - we have had only one return but the Boss kept us in the loop and warned us about the Q313 Solder Blob problem as he called it.
So to reduce that current - if you use the 1K - it will not hold up well - but if you use TWO of them - it will - you use the 1K (just one) at NZ8N mod spot, and place 1K over the top of the 1 Meg resistor (105 R339) just line it right up top of the 1 Meg and tack solder both sides. You don't anything else. You've brought the limiter action down and you even have some limiter action still but allows you to attain 80+ watts (as shown on MFJ meter in Smokin Joe's shop...) if the thing can really attain it.
The D300 is a fail-safe device - one-way valve - but the Q313 and EDIT (308) Q312 (Limiter) clamp so hard - its' for that reason so it (the Fail safe) doesn't engage that fail-safe mode, the radio can go into that mode if it gets too hot or shutdown - but you didn't hear this from me ok? I get yelled at otherwise...