Hi Steve, nice work. Do you have any background on the relationship between filter 'Q' and filter volume? I know the greater the volume, the greater the Q, but could do with the maths to link the two!
Sorry don't have access to the maths but you are correct the greater the volume the higher the Q these did not quite work needed an extra cavity on both to achieve 1.6mhz seperation as they stood 7.6 mhz was easy
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@@steveedwards90 hi Steve, thank you for these videos. So, you HAVE succesfully used 3 of theese cavities on each side for the 1.6MHz repeater shift? With the actual repeater?
@ no I only ever made 4 2rx 2tx my tests showed for 1.6mhz 3 a side would be needed for 7.6 2 a side would be effective sorry I did not pursue this project as diagnosed with throat cancer so all on hold be safe
Steve says it's "Vhf manual, circa 1992", but I couldn't find anything. It would be interesting to find a photo of the cover to figure out exactly what version it is.
Good job
the rsgb vhf uhf manual from 1990 ish will be posting an update soon the bandspread is close to 7-8 mhz hope this helps
Where can I find the pictures of the scheme that appears in the video?
hi ! good video! I just found it... question.. could you share the name of the book that you are showing ?
Read the comments it's in there
RSGB (Radio Society of Great Britain) VHF-UHF Manual.
hola ese libro donde lo consigo gracias ce4ule ricardo chile
Hi Steve, nice work. Do you have any background on the relationship between filter 'Q' and filter volume? I know the greater the volume, the greater the Q, but could do with the maths to link the two!
Sorry don't have access to the maths but you are correct the greater the volume the higher the Q these did not quite work needed an extra cavity on both to achieve 1.6mhz seperation as they stood 7.6 mhz was easy
@@steveedwards90 hi Steve, thank you for these videos. So, you HAVE succesfully used 3 of theese cavities on each side for the 1.6MHz repeater shift? With the actual repeater?
@ no I only ever made 4 2rx 2tx my tests showed for 1.6mhz 3 a side would be needed for 7.6 2 a side would be effective sorry I did not pursue this project as diagnosed with throat cancer so all on hold be safe
What Is the name of this Book?
Vhf manual rsgb radio society Great Britain circa 1992
@@steveedwards90 I'm looking for it, but can't find it. More info or photo PSE TNX.
@@steveedwards90 What color is the cover? Do you have a picture? Thanks
@@in3elxroberto155 white with red writing
@@steveedwards90 Thanks. I have only found the orange or blue one on ebay. Red none.
i need to know the name of that book
Steve says it's "Vhf manual, circa 1992", but I couldn't find anything. It would be interesting to find a photo of the cover to figure out exactly what version it is.