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Dressler ara30
Hi all I use an Dressler ARA 30 active antenna, how ever the PSU that I
used to power it 12V has gone belly up and in doing so it has melted a resistor inside the little box that comes with the antenna. Inside the box are 2 caps and 1 resistor, I can not get any colour code from it due to the damage so I cant simply replace it. Does any one know what this resistor could be please? TIA, Mike. |
#2
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Dressler ara30
mike lee wrote:
Hi all I use an Dressler ARA 30 active antenna, how ever the PSU that I used to power it 12V has gone belly up and in doing so it has melted a resistor inside the little box that comes with the antenna. Inside the box are 2 caps and 1 resistor, I can not get any colour code from it due to the damage so I cant simply replace it. Does any one know what this resistor could be please? TIA, Mike. Could very well be an RF choke that happens to look like a resistor. Are you sure the preamp itself is not fried? -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Use only Genuine Interocitor Parts" Tom Servo ;-P |
#3
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Dressler ara30
"RFI-EMI-GUY" wrote in message ng.com... mike lee wrote: Hi all I use an Dressler ARA 30 active antenna, how ever the PSU that I used to power it 12V has gone belly up and in doing so it has melted a resistor inside the little box that comes with the antenna. Inside the box are 2 caps and 1 resistor, I can not get any colour code from it due to the damage so I cant simply replace it. Does any one know what this resistor could be please? TIA, Mike. Could very well be an RF choke that happens to look like a resistor. Are you sure the preamp itself is not fried? -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© I agree with Joe- the preamp may have gone west. Some power inserters do use a series resistor- but more often a choke. The only reason for it to burn up would be excessive current draw by the preamp- or a kinked and shorted feedline. Put a VOM across the preamp input and see what the input resistance looks like. Tantalums on the input often short when exposed a surge. Dale W4OP Dale W4OP |
#4
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Dressler ara30
Dale Parfitt wrote:
"RFI-EMI-GUY" wrote in message ng.com... mike lee wrote: Hi all I use an Dressler ARA 30 active antenna, how ever the PSU that I used to power it 12V has gone belly up and in doing so it has melted a resistor inside the little box that comes with the antenna. Inside the box are 2 caps and 1 resistor, I can not get any colour code from it due to the damage so I cant simply replace it. Does any one know what this resistor could be please? TIA, Mike. Could very well be an RF choke that happens to look like a resistor. Are you sure the preamp itself is not fried? -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© I agree with Joe- the preamp may have gone west. Some power inserters do use a series resistor- but more often a choke. The only reason for it to burn up would be excessive current draw by the preamp- or a kinked and shorted feedline. Put a VOM across the preamp input and see what the input resistance looks like. Tantalums on the input often short when exposed a surge. Dale W4OP Dale W4OP The only case I could see where it might be a resistor is if a MMIC like a MAR-6 is the amplifier device. In that case calculating the resistor would be easy per the device spec sheet. It doesn't look like Dressler has published a schematic, so some reverse engineering might be in order. -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Use only Genuine Interocitor Parts" Tom Servo ;-P |
#5
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Dressler ara30
I agree with Joe- the preamp may have gone west. Some power inserters do use a series resistor- but more often a choke. The only reason for it to burn up would be excessive current draw by the preamp- or a kinked and shorted feedline. Put a VOM across the preamp input and see what the input resistance looks like. Tantalums on the input often short when exposed a surge. Dale W4OP Dale W4OP The only case I could see where it might be a resistor is if a MMIC like a MAR-6 is the amplifier device. In that case calculating the resistor would be easy per the device spec sheet. It doesn't look like Dressler has published a schematic, so some reverse engineering might be in order. -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© The resistive voltage divider/ isolator was fairly common in some of the LF power inserters- Burhans et al: http://members.shaw.ca/ve7sl/burhans.html Dale W4OP |
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