rci 2970dx,,strange goins on..when i talk on ssb the watt meter goes up ta 100 er so watts which is fine ,but the strange part..when i release the key the watt meter stays on 100 watts ? ? now befor you say the watt meters no good the amp meter on the power supply goes up to 18 or 20 amps and it stays there too ..open fer suggestions..
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look out fellers,shes agonna blow..
- Thread starter Splash1
- Start date
had a similar issue on a proIII, i had a bad cable that was leaking RF and that was latching the transmitter in xmit. it wouldn't unkey 'till i lowered the output power.
if its still drawing 18-20 amps in SSB ,then it sounds like it is not only "keyed" but there is some audio (aka "noise") being xmitted too
if its still drawing 18-20 amps in SSB ,then it sounds like it is not only "keyed" but there is some audio (aka "noise") being xmitted too
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i agree lower output.also check mic gain sounds like ya might be picking
up background noise.i se mine at 12 oclock then adjust with whatever
power mic i choose.if ya running the stock mic or noise cancelling mic
then shouldnt have to turn down mic gain.definately turn down power
on radio though
up background noise.i se mine at 12 oclock then adjust with whatever
power mic i choose.if ya running the stock mic or noise cancelling mic
then shouldnt have to turn down mic gain.definately turn down power
on radio though
It's rf feedback, i'm sure. How far is your antenna from your transceiver? Also, are you using a power mic? I have this problem using my astatic mic on ssb. When i use a standard mic the problem is immediately remedied. Use ferrite chokes on your feedline/mic cable. Hope this helps.
Damo..the antenna,s bout 40/50 feet from radio..i do use a 575 astatic power mic..hooked it up today and its not doing it now.dont know bout rf feed back though theres no mic bite and no tvi..also swr is good and almost no reflect..Hotrod,,doesnt seem to matter where the power is set and i did turn down the mic gain plus i put the mic flat against the padding of the chair to prevent any sound getting to the mic and it still did it..Hookiedon6,,if it where a cable leaking i would think there would be some tvi,,the tv is only 14 feet from the radio..sometimes when i key the mic a few times the meter will go back down till i key again..Moleculo,,no,,when i when i unkey the'' radio isnt tx,ing'' i never checked that..seems like it does this more when the radio has been running awhile..my setup is radio,,watt meter,,powersupply,,antenna tuner,, lowpass filter....i have everthing grounded to the low pass filter, which is last in lineand from there out the window 6 feet to a ground rod..also to ground the power supply i have 8 gauge wire connected to the negitive terminal straight to the filter..my other radio doesnt do this but its only a 30 watter..
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Everything should be grounded to a common ground buss and then to the ground rod. Even better, it should be tied into the house ground. The way you have everything grounded to the Low Pass Filter is a problem. I don't know if it's causing *this* problem, but I wouldn't rule it out. I wouldn't be surprised if you've created a serious ground loop that is picking up RF and causign the radio TX relay to hang. BTW, you could very well have a bad cable leaking RF and never notice it on your TV. I would also look very closely at HookedOn's suggestion.
i dont understand how a leaky cable would be the problem..the watt meter shows 100 watts even when the mic is unkeyed.therfor no rf is being generated so theres no rf to leak outta the leaky cable..just guessing id,d figer the amp inside the 2970 is sticking on or something wrong with the mic..
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"amp meter on the power supply goes up to 18 or 20 amps and it stays there too"
if it is drawing 20 amps in SSB, then it is not only in xmit, but it is also generating a modulated rf signal.... the mic doesn't have to be "keyed' if the rf is getting inside the rig.
does the rig have a monitor function you can listen to? can you listen to its output on a different rig? i'll bet it isn't sending a "dead" ssb signal, there is 100 watts of audio (or hash) being transmitted, thats why its drawing FLA.
My antenna is only about 25 feet away. I cannot even use my astatic on ssb as it's prone to the same problem you get when i turn my gain from 3 onwards. Ie- the needle just stays at full power or becomes very erratic. With a dynamic mic i don't have a problem. I think it's the circuitry in the astatic mic that's not shielded adequately. I would suggest using ferrites/chokes on your mic lead and or grounding the antenna bracket. It helped me, but i just resort to using my stock mic on ssb now as it sounds better.
well im lost here.i run a d104 all the time on ssb.i had a 575 before also never
had this kinda problem.you got another mic ya could use/[power mic]
had this kinda problem.you got another mic ya could use/[power mic]
I suggest to try transmitting into a dummy load. Because a dummy load wont radiate unless your coax shield is broken.
If you still have the trouble into a dummy load, then something is wrong with your CB.
If the problem goes away, then you have "rf in the shack" from your antenna.
If you still have the trouble into a dummy load, then something is wrong with your CB.
If the problem goes away, then you have "rf in the shack" from your antenna.
That's my problem.Into the dummy load my astatic modulates on ssb as normal, but when i use my antenna it often plays up. I use new coax and my antenna is only about 25 foot away and level with me. This suggests that the astatic is very poorly shielded. I tried 3 other power mics and a dynamic and they work fine.
