You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

I like coax that has a foil around the center insulator and full braid. Velocity factor should be as high as your wallet can afford. I use the Belden 9913Flex - which is roughly equivalent to the Times/Microwave LMR-400.

Since both radios showed a 1.4 to 1 match; that pretty much eliminates the antenna/coax system as the problem. So - it points the finger clearly at the Grant XL. Since you have another radio to test in this system, and if that should work OK - it will prove conclusively that the Grant XL has a problem.

LC is right about the meter reading ALL power coming thru it - including harmonics. Which may skew what power it is really putting out. Either the Grant XL needs to be tuned up - or a final transistor is at fault. Using a filter between the radio and your watt meter will determine that the power entering the meter is seeing just the 27 mhz range - and NO harmonics. If you have one or can borrow a decent one - it may help to diagnose the radio's output reading. Personally, - I think it is the final. It is a common problem that can happen to anyone at almost any time. You never know when one will snap until they do...

<blockquote data-quote="Robb" data-source="post: 150642" data-attributes="member: 8446">I like coax that has a foil around the center insulator and full braid.&nbsp; Velocity factor should be as high as your wallet can afford.&nbsp; I use the Belden 9913Flex - which is roughly equivalent to the Times/Microwave LMR-400.Since both radios showed a 1.4 to 1 match; that pretty much eliminates the antenna/coax system as the problem.&nbsp; So - it points the finger clearly at the Grant XL.&nbsp; Since you have another radio to test in this system, and if that should work OK - it will prove conclusively that the Grant XL has a problem.LC is right about the meter reading ALL power coming thru it - including harmonics.&nbsp; Which may skew what power it is really putting out.&nbsp; Either the Grant XL needs to be tuned up - or a final transistor is at fault.&nbsp; Using a filter between the radio and your watt meter will determine that the power entering the meter is seeing just the 27 mhz range - and NO harmonics.&nbsp; If you have one or can borrow a decent one - it may help to diagnose the radio&#039;s output reading.&nbsp; Personally, - I think it is the final.&nbsp; It is a common problem that can happen to anyone at almost any time.&nbsp; You never know when one will snap until they do...</blockquote>

[QUOTE="Robb, post: 150642, member: 8446"] I like coax that has a foil around the center insulator and full braid. Velocity factor should be as high as your wallet can afford. I use the Belden 9913Flex - which is roughly equivalent to the Times/Microwave LMR-400. Since both radios showed a 1.4 to 1 match; that pretty much eliminates the antenna/coax system as the problem. So - it points the finger clearly at the Grant XL. Since you have another radio to test in this system, and if that should work OK - it will prove conclusively that the Grant XL has a problem. LC is right about the meter reading ALL power coming thru it - including harmonics. Which may skew what power it is really putting out. Either the Grant XL needs to be tuned up - or a final transistor is at fault. Using a filter between the radio and your watt meter will determine that the power entering the meter is seeing just the 27 mhz range - and NO harmonics. If you have one or can borrow a decent one - it may help to diagnose the radio's output reading. Personally, - I think it is the final. It is a common problem that can happen to anyone at almost any time. You never know when one will snap until they do... [/QUOTE]

Top Bottom