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Stryker Sr 955hpc high swr on ssb?
- Thread starter 338_MtRushmore
- Start date
I know it's an old thread but I had to laugh when I first saw that as well. You never check SWR in SSB mode.
Shadetree Mechanic
Delaware Base Station 808
Of course, turning the mike gain to zero in SSB transmit should get you ZERO on the external wattmeter.
If you do show a steady or fluctuating meter reading, it leaves two possibilities.
1) The SSB mike audio has a buzz, hum or squeal on it, and that's what drives up the wattmeter, spurious audio in the sideband modulator.
2) The driver and/or final stages are oscillating. If there is enough accidental RF feedback in the power sections of the transmitter, it will produce its own, separate RF signal. A frequency counter placed in line would show a reading that is nowhere near the selected channel frequency.
My bets are on option two. This is yet another odd symptom that can be identified at a glance with a spectrum display of some sort. Don't have to have a multi-kilobuck lab instrument, although they're quite nice. More like a 30-dollar RTL USB dongle plugged into your computer running free SDR software. Most of them go down to about 25 MHz without an adapter like the NooElec Ham It Up.
A cheap SDR is not a bad spectrum display.
These guys are a good place to check that out. https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/
73
If you do show a steady or fluctuating meter reading, it leaves two possibilities.
1) The SSB mike audio has a buzz, hum or squeal on it, and that's what drives up the wattmeter, spurious audio in the sideband modulator.
2) The driver and/or final stages are oscillating. If there is enough accidental RF feedback in the power sections of the transmitter, it will produce its own, separate RF signal. A frequency counter placed in line would show a reading that is nowhere near the selected channel frequency.
My bets are on option two. This is yet another odd symptom that can be identified at a glance with a spectrum display of some sort. Don't have to have a multi-kilobuck lab instrument, although they're quite nice. More like a 30-dollar RTL USB dongle plugged into your computer running free SDR software. Most of them go down to about 25 MHz without an adapter like the NooElec Ham It Up.
A cheap SDR is not a bad spectrum display.
These guys are a good place to check that out. https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/
73
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This high dollar meter will give instant VSWR and power output in AM and SSB at all times.
These are the meters I use ......
https://www.arraysolutions.com/pm2-3k-n
These are the meters I use ......
https://www.arraysolutions.com/pm2-3k-n
The 30-buck SDR dongle would show you extra frequencies, if the radio's power stage is producing them.
Cheapest spectrum display there is, if you have a computer and display to plug it in to.
An inline wattmeter can't tell you how many frequencies the radio is feeding into it.
73
Cheapest spectrum display there is, if you have a computer and display to plug it in to.
An inline wattmeter can't tell you how many frequencies the radio is feeding into it.
73
The problem I had with mine bumping the Swr protection on SSB when power turned up past 40 watts was grounding issues within the radio. Sent it to the recommended shop by Stryker Key radio repair and they went over all the internal grounds they say and it did fix the problem I can run the radio full 80 watts on SSB now without it hitting the Swr protection
guys this is what i found on ssb swr issue on striker 955 looks like on ssb has a derty or harmonic issue that couse the problem,ok what i did i adjust the anl ssb inside that clean everything up including the swr issue ,you would loose a bit of watts but its ok now you have about nice 50+ clean watts not 80w no more swr issue on ssb.