Any Recommendations for a cheap directional coupler (<£100) or should I diy it? It needs to be able to cover up to a few hundred Mhz so I can test for harmonics.

ebay ali

Rigmo do you have any specific recommendations? What coupler are you using?

Anyone else got any advice on decent couplers?

I have one of these
it's excellent...

However I wish it was 30db and not 60db

BriansBrain wrote: ↑Mon May 04, 2020 7:11 pm I have one of these

Bi Directional Coupler 80MHz to 1000MHz 60dB 200W Connecticut Microwave 441270-S.jpg

it's excellent...

However I wish it was 30db and not 60db

Did you get it on ebay?

If you can get a bunch of 3db couplers and bandpass filters - you can cascade them to combine transmitters into a single antenna system

Bton-FM wrote: ↑Mon May 04, 2020 8:40 pm

BriansBrain wrote: ↑Mon May 04, 2020 7:11 pm I have one of these

Bi Directional Coupler 80MHz to 1000MHz 60dB 200W Connecticut Microwave

Did you get it on ebay?

Yes...

6 months ago... it cost €48

Has anyone had success with building their own coupler ?

I also saw on Dutch RF Shop there is a coupler that is rated 800-2500mhz.In the description it said that the coupler is fine on 100mhz. I emailed them and they said that they have used it to test transmitters but they first worked out the difference in coupling below the recommended frequency range and then corrected the readings from the analyser.

On DRFS these are €17.95 but the same ones are on eBay for under a score....sounds like it’s worth a go! And if it doesn’t work out then at least you get 3 n connectors and a die cast box!

Here it is: https://dutchrfshop.nl/en/hf/607-direct ... upler.html

Mini Circuits ZFDC-20-400 1GHz 20dB Directional Coupler Type N ans BIRD Bird 4275-020 Variable RF Sampler 20-1000MHz
this is names I only trust in accurate measurement
BIRD and Mini Circuits! any connector... sma bmc N

for play ... not professional...

rigmo wrote: ↑Tue May 12, 2020 10:54 pm Mini Circuits ZFDC-20-400 1GHz 20dB Directional Coupler Type N

Thanks for the info

I have seen this second hand on ebay and ordered one
What sort of power do you think it wit handle

BriansBrain wrote: ↑Wed May 13, 2020 2:18 pm

rigmo wrote: ↑Tue May 12, 2020 10:54 pm Mini Circuits ZFDC-20-400 1GHz 20dB Directional Coupler Type N

Thanks for the info

I have seen this second hand on ebay and ordered one

Mini Circuits 1-1000MHz 30dB Directional Coupler ZFDC-20-400.jpg

What sort of power do you think it wit handle

it can only handle about a watt I think

Bton-FM wrote: ↑Wed May 13, 2020 4:12 pm

BriansBrain wrote: ↑Wed May 13, 2020 2:18 pm

rigmo wrote: ↑Tue May 12, 2020 10:54 pm Mini Circuits ZFDC-20-400 1GHz 20dB Directional Coupler Type N

Thanks for the info

I have seen this second hand on ebay and ordered one

Mini Circuits 1-1000MHz 30dB Directional Coupler ZFDC-20-400.jpg

What sort of power do you think it wit handle

it can only handle about a watt I think

1 watt = good enough for LPF trimming