AnyTone AT 6666 VS Stryker 955 hpc

[asuddendeath]

Looking at getting something for my car, Ill pair it with a Rocket HD450 amp.
Not sure what is going to be better out of the box. My Stryker 955 I use now for a home base seems to work well.
If anyone else has an idea for a radio let me know. Needs to have a little drive to it to push the amp.
Thanks

 

[jonwienke]

The Stryker doesn't need an amp, it will do 60-80 watts barefoot. It will fry an external amp--they typically expect 2-4 watts going in.

 

[asuddendeath]

Check out the 450.
Store

I talked with the dude today. He say guys with Strykers are smoking with his amp.

 

[jonwienke]

From your link:
"Preferred Dead Key Input: 10 to 15 watts (Max)"

You'll need to keep the Stryker power turned down, or you'll be smoking the amp permanently.

 

[asuddendeath]

LOL right. My Stryker is stock. No tune up. I don't see the dead key being above 20 ever.

Just crank the power knob down 1/4 and I should be safe.

 

[jonwienke]

The 955 does 60-80W dead key out of the box without any golden screwdrivering. Turning the output power above 1/4 will likely liberate magic smoke in the amp.

Seriously.

 

[asuddendeath]

from everything I see out of the box it dead keys around 11W and swings 60-80W.
If you have a link that will show me that I am wrong I as all for it.
Thanks

 

[jonwienke]

I got my meter out and hooked it up. I'm using a cigarette lighter plug, so at full power, voltage drops below 11V if the truck isn't running, and the radio complains. Turned all the way up, FM output was just over 40W continuous. SSB fluctuated up to 60W peak. AM was significantly lower, about 10W average regardless of modulation, which seems unnecessarily low compared to the FM output. It should be able to do at least 20W dead key without exceeding 100% modulation. If that's the typical factory adjustment, then you should be OK driving the amp in AM mode, but would probably fry it if you flipped to FM.

 

[asuddendeath]

Right. Thats what I thought they where putting out. I saw my drives higher on FM too.

 

[prcguy]

If the radio is adjusted right, peak AM power should be the same as SSB and unmodulated AM carrier power should be about 1/4 of peak.
prcguy

I got my meter out and hooked it up. I'm using a cigarette lighter plug, so at full power, voltage drops below 11V if the truck isn't running, and the radio complains. Turned all the way up, FM output was just over 40W continuous. SSB fluctuated up to 60W peak. AM was significantly lower, about 10W average regardless of modulation, which seems unnecessarily low compared to the FM output. It should be able to do at least 20W dead key without exceeding 100% modulation. If that's the typical factory adjustment, then you should be OK driving the amp in AM mode, but would probably fry it if you flipped to FM.

 

[jonwienke]

Why 1/4? Shouldn't unmodulated AM carrier should be 1/2 peak AM output?. Peak AM power was nowhere near 40W, more like 15-18W, which I would expect if modulating a 10W AM carrier <=100%.

It looks to me like the AM output has been turned down unnecessarily low compared to FM and SSB, and it could be doubled to match the FM output without risking damage to the RF amp.

 

[prcguy]

In a properly working AM transmitter 100% modulation happens when the sidebands increase about 6dB in power because you have two sidebands and there is 3dB of peak power in each sideband at full modulation and they combine for 6dB. A 6dB power increase is 4X, so if your AM transmitter puts out 10W dead key, ideally it puts out 40W peak with full modulation. A legal CB putting out 4W actually puts out 4W carrier and 12W peak in AM mode. Every legal CB does close to this right out of the box or maybe just a little less due to the conservative mod limiter settings from the factory.

On the topic of amplifiers, it seems common to try and get the amplifier to put out maximum saturated power with the CB dead keying. That is the worst thing possible you can do and that's how most amplifiers are run these days. You have a Palomar whatever rated at 100W and by golly the owner is pissed unless that amp puts out at least 100W when he dead keys into it. In reality that amp should be driven for 25W output dead key in AM mode so it can reach 100W when you fully modulate, otherwise you only get a fraction of the benefit of using the amp and your signal is all screwed up and distorted.
prcguy

Why 1/4? Shouldn't unmodulated AM carrier should be 1/2 peak AM output?. Peak AM power was nowhere near 40W, more like 15-18W, which I would expect if modulating a 10W AM carrier <=100%.

It looks to me like the AM output has been turned down unnecessarily low compared to FM and SSB, and it could be doubled to match the FM output without risking damage to the RF amp.

 

[jonwienke]

I was thinking voltage, which peaks at double the voltage of an unmodulated carrier at 100% modulation. But power is the square of voltage, and I need to start drinking coffee earlier in the morning.

 

[prcguy]

If you don't have a good peak reading wattmeter then using an oscilloscope and going for 2X increase in voltage for 100% mod will work fine. Or with a scope you should really be looking at the area where the modulation envelope just pinches off to determine 100% mod.

I was thinking voltage, which peaks at double the voltage of an unmodulated carrier at 100% modulation. But power is the square of voltage, and I need to start drinking coffee earlier in the morning.

 

[BloodandRoses]

I have both radios no need for an amp....

 

[jonwienke]

I agree.