Raj, indeed I did not reply to anything. Acknowledged you have two boards with stock 560nH L5 and L7 and there was no significant change. I will see to find at a local store both values (560 and 680) in SMD format. According to the circuit description the filter is around 500 ohm
Il 16/ott/2018 13:10, "Raj vu2zap" <
rajendrakumargg@...> ha scritto:
>
> Oos,
>
> You replied to some other issues, so no idea what you replied to.
>
> L5 and & on two board stock values was around 560nH.. they needed two more turns and that did not
> help much. These filters are 650 Ohms IMHO.
>
> The sample book had no 720uH so the nearest I took 680nH. Make do!
>
> Still no enlightenment of why SMDs worked.. probably shielding and being close to the ground plane
> below.
>
> At 16/10/2018, you wrote:
>
>> Are the values of L5 and L7 well calculated? The stock are 720nH, the Raj's are 680nH, but I get on software something like 530nH if the network has a 50 ohm input and a 500 ohm output. Another question is whether or not a different topology of toroids would give better results.
>>
>> Il 16/ott/2018 05:59, "Raj vu2zap" <
rajendrakumargg@...> ha scritto:
>> A close up sharp photo will help to check.
>>
>> V3 or V4 ?
>>
>> Raj
>>
>> At 16/10/2018, you wrote:
>> >Hello All,
>> >
>> >I just finished implementing the 45 Mhz crystal filter fix with the 7:2 impedance matching transformer on the output of the crystal. Now I am hearing myself in the speaker when I transmit and I am seeing the carrier wave on the SA when I push the PTT on the mic.
>> >
>> >I not sure why the crystal filter mod would be related to these two issues. Anyone experience anything similar?
>> >
>> >Ripley
>
