cavity filter part 1

[@felipefigueroa9449]

Good job

[@rubidiotesla4458]

Where can I find the pictures of the scheme that appears in the video?

[@steveedwards90]

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

[@darioj.7454]

hi ! good video! I just found it... question.. could you share the name of the book that you are showing ?

[@steveedwards90]

Read the comments it's in there

[@AlienRelics]

RSGB (Radio Society of Great Britain) VHF-UHF Manual.

[@ricardocontreras1619]

hola ese libro donde lo consigo gracias ce4ule ricardo chile

[@SteveWithnell]

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!

[@steveedwards90]

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?

[@steveedwards90]

@ 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

[@eugeniomagalhaes720]

What Is the name of this Book?

[@steveedwards90]

Vhf manual rsgb radio society Great Britain circa 1992

[@in3elxroberto155]

​@@steveedwards90 I'm looking for it, but can't find it. More info or photo PSE TNX.

[@in3elxroberto155]

@@steveedwards90 What color is the cover? Do you have a picture? Thanks

[@steveedwards90]

@@in3elxroberto155 white with red writing

[@in3elxroberto155]

​@@steveedwards90 Thanks. I have only found the orange or blue one on ebay. Red none.

[@douglascardenas9517]

i need to know the name of that book

[@in3elxroberto155]

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.