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SVR200 help

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AZ_chris

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Jan 18, 2006
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Glendale, AZ
Just got a SVR-200 and am testing it. Was a Tennessee Highway Patrol unit.

However, I noticed that the transmit audio from the portable is way too low.

I'm sure they were using different units connected to it, but I'm using a CDM1550.
What should I adjust to get the receive audio better, or does the unit need realigning?

I put out a seperate thread looking for those who can realign it anyways.

Thanks guys
 

sfd119

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Jul 18, 2009
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There's a pot inside on the circuit board that can be adjusted to increase receive and transmit audio on the unit. I do not remember what it is. Contact Pyramid support via email, they'll be happy to email you what pot you need to adjust.
 

dpcain

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Dec 14, 2008
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MD
Two things.
Pots:
Maximum deviation/lock tone deviation: Adjust RV7 (lock tone deviation) for maximum. If the SVR-200 is programmed for sub-audible encode, adjust RV6 (CTCSS) for minimum. Adjust RV8 (repeater deviation) for 95% deviation. Adjust RV7 for 60% deviation.







There's also jumpers:
J1 - Controls the maximum drive level of the transmit audio output to the mobile radio. If J1 is installed, output amp U1B will have an adjustment range of 0-100 mVPP. If J1 is removed, U1B can be adjusted between 0-5VPP.


J2 - Controls the output impedance of the transmit audio line to the mobile radio. If connected to a low impedance point in the mobile, installing JP2 sets the output impedance to 600 ohms. If JP2 is open, the output impedance is 2.2Kohms. Install the jumper for radios that require a lot of modulation drive or that have low impedance microphone circuits. Remove the jumper if the SVR-200 installation decreases local microphone audio at the mobile.


From the SVR-200 service manual.


If you're a qualified technician / technically capable, hopefully that's helpful.

If not, do try and grab a tech, it would suck to see the wrong thing get misadjusted so the magic smoke comes out.
 

AZ_chris

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Joined
Jan 18, 2006
Messages
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Location
Glendale, AZ
I talked with Pyramid earlier, it appears a 100K resistor on the R13 circuit (which is for Kenwood) instead of a 2.2K resistor for Motorola may be causing the issue. I adjusted RV7, it helped a little but there is still too much noise vs. audio too low.

Either way I sent it back to Pyramid for service.
Thanks for trying to help guys :)
 

RFI-EMI-GUY

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Dec 22, 2013
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Are you using this for wide band or narrow band? Most of the surplus units expect 5 KHz deviation
 
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