You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
AM has a lower powered carrier than AM so explain to me your statement because you are wrong. Lock down a radio on FM & see how long it last. The 718 has no FM mode.
My delay on my kl503HD is too long. It has a 3.3uf cap. I did do away with the driver transistor. The long delay was long both ways so taking driver out didn’t do it. Now with just 8 finals it sounds perfect on ssb. With that driver it sounded bad. I want to change the capacitor from 3.3uf to a...
The kl503 doesn’t even use the mrf454 case style type transistors. They use case style transistors the same as the finals in the Anytone AT6666 radio uses.
I bypassed the driver so only eight finals are being used. I took out the 3.3 pf Capacitor at the input so239 & put in a 15 pf. I have it in line with my icom. 30 pep on SSB now it does 325 watts peak. I listened to it & it sounds just like the radio does with amp off. Only thing seen is an...
It has a -7db attenuator inside to make it handle more dead key. No more than 5 watt carrier & 35 swing. I wouldn’t swing no more than 25 because it doesn’t produce anymore power after 25 pep.
I put a 15 pf in mine, removed the 3.3. It seems ok now.
The KL503HD will never see 600 pep. I removed the -7db attenuator & it produces more power. Ssb radio peaking 8 watts pep the amp makes 320 watts. Anymore power it doesn’t produce anymore so I leave it at 8 pep out of my ic718.
As far as this amp sounding bad on SSB. Remove the 3.3 pf capacitor where the so239 is on the input side C34 & put a 15 pf cap in its place. Problem solved. I noticed my meter wasn’t responding to my words on SSB & it sounded horrible around town. A friend 20 miles away could barely hear it...
They are class C for SSB use. I have one that peaks 200 watts with 15 swing on SSB. On AM I use a 2 watt carrier & swing 15 , gives me 40 watt dead key & swings 200 with 15 pep swing. The tuned input on mine is perfect, 1.2 SWR. Mine has adjustable tuning on the input & output transformer. I...
The bias does change in ssb mode. The transistors
slightly turn on in ssb mode to keep your voice from clipping. Then a delay is added too with a capacitor.
I’m sure after a person buys one they never do again. It’s a viscous cycle. Then another person watches this bogus video & that sells another. After that cycle of about 100 radios just guessing out of the North American population the damage is done. He made his money & then the new model comes...
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.