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Thanks for that buddy. I don't use AM, just SSB and FM here. Do you know what the FM input power limits would be?

I've just picked up a box full of CB gear from the Widow of a silent key. Amongst the inventory are a Zetagi B300P, Zetagi B550P, RM KL203, RM KL200, and RM KL505V. Does anyone know what maximum input power I should be driving these with for long term reliability & longevity?

You should use a signal generator really. Failing that, use a factory set rig and set it to the same reading.

I recently got hold of a workman 5 tone roger beep and installed it. Does anyone know what components to change in order for it to make a weird and wonderful roger beep/s please? I'm not too happy with the results i'm getting from it by altering the blue variable presets. Thanks in advance for...

I recently got hold of a workman 5 tone roger beep and installed it. Does anyone know what components to change in order for it to make a weird and wonderful roger beep/s please? I'm not too happy with the results i'm getting from it by altering the blue variable presets. Thanks in advance for...

Hi. I'm interested in purchasing a new mobile/standard hf rig(0-30Mhz) that does 11m fm frequencies from the box and really don't want to pay much more than £700. I'm aware that the Icom 706 is easily modified, but the mod would deplete the default warranty. Any ideas please? Cheers in advance.

Hi Misterfatty. Somebody else on another forum suggested a "vco lock" problem. I also thought the vco could be at fault. However, the motorboating doesn't happen when i turn the rf output power down to 3 watts or lower. At 3.5 watts it motorboats for 5 secs or so then settles fine, but anything...

I'm unsure, as i'm a UK resident. Please disregard this query anyway as i've now purchased one. Cheers.

Hi. I've tried the transceiver on a fully charged battery, a 40 amp regulated psu and a dummy load with the same results. These criteria can be discounted. Regards.

Hi. I have an old Binatone uk fm cb that motorboats when i tx from channel 35 to 40 but not on the lower channels. It motorboats gradually worse as i go from 35 to 40, but doesn't do it when i turn the rf power down. In addition to this, it only motorboats for about 5 secs, the s meter...

Hi. I have an old Binatone uk fm cb that motorboats when i tx from channel 35 to 40 but not on the lower channels. It motorboats gradually worse as i go from 35 to 40, but doesn't do it when i turn the rf power down. In addition to this, it only motorboats for about 5 secs, the s meter...

Hi Bob85. Thanks very much indeed for the reply. I noticed the schematic was somewhat different than the b150, and that's good. On this note i look forward to getting myself another ssb transceiver in the hope that my audio is now decipherable. Cheers and best regards.

Hi. I've just picked up a b300 for a pittance and repaired it. I have a query ; What class amp is it? I think it's a class c but with some feedback from collector to base. I ask, as i had a Zetagi b150 that just didn't sound at all well on ssb due to it being class c which is only suitable for...

I'm about to purchase a Zetagi m95 hand mic. It's the grey one with a yellow slider. Anyone able to offer any input re the audio clarity on this unit please? All feedback is much appreciated. Regards.

Anybody know where i can source these IRF520'S? I'm also trying to source the MS1307 as used in crude cb amp's. Cheers.

I think he's trying to find a replacement transistor. The appropriate transistor would be a MRF455. Hope this helps.

As well as the suggestions provided, have you thought about using a bandpass/low pass filter after the amp? When i used to go mobile, i used to set car alarms/house alarms off regularly using just a 30 watt amp. When a filter was fitted, problems reduced by over 75%. Good luck mate.

Hi. I've think i've established that it's not right for ssb as it's a class c. I drive it with 4 watts on am/fm and 4 watts pep on ssb. I might try a variable resistor in the r4 position to see if i can improve things. Failing that, i'll just return the alc in my radio to do more power and omit...

that makes sense. What's more, a lead acid battery is only slightly over 12v so the bias will be even less. I've done a bit of searching on the net, and the schematic does seem very similar to a class c but with an added resistor. I might try adding a variable resistor in place of the gate...

Your comments are very much appreciated. I will buy a new power pack and try that route. Failing that, it's Zetagi falsely advertising their products for use on ssb. Have a nice weekend guys, and thanks for clearing that one up for me.