Help with component suitability in PLL Transmitter

[Zeroexpo]

Hi Guys,

I initially posted my question here https://www.badcaps.net/forum/showthread.php?t=39037 as it's also related to the suitability of a Capacitor, but since it's probably more Electronics related I thought I might get a better response here.

I plan on completing the build today, so would love to hear some replies from the experienced guys in this field.

In a nutshell, the circuit is a 4W PLL transmitter and the electrolytic Capacitors I'm planning on using are nowhere near RF - they're near the logic stages as far as I can tell.

A huge thanks in advance for your educated replies and help.

[Kiriakos GR]

Re: Help with component suitability in PLL Transmitter

There is no need for Low-ESR capacitors on a 4W PLL transmitter.
You will use regular parts, and you will use a transformer based PSU for it, so to avoid a pulsing power supply and all it harmonics.
I am aware that you are after the perfect possible result in your assembly, but this is a classic design that is used for 25 years now, and does not need any magic so to become perfect.

[Zeroexpo]

Re: Help with component suitability in PLL Transmitter

Hi Kiriakos,

I've ran out of general purpose Electrolytic Capacitors as I've used them all up on the build - I just wonder, since I only have low ESR left (Panasonic FC), is it OK to use these only in component positions, C68, C69, and C70 as shown on the schematic?

Many thanks for your input.

[SteveNielsen]

Re: Help with component suitability in PLL Transmitter

It will be fine to use them.

[Kiriakos GR]

Re: Help with component suitability in PLL Transmitter

The use of parts with better specifications in basic applications seems as waste to me, but if works best for you.. then use them.

Regarding the schematic, the picture is not that great for seeing details, what it is important is to not use higher capacity than what is suggested.

[Zeroexpo]

Re: Help with component suitability in PLL Transmitter

Thank you for your valued input, Guys.

[budm]

Re: Help with component suitability in PLL Transmitter

Is there a place I can download that diagram/manual of what you posted?
Is this the kits?
http://www.nrgkits.co.nz/product_inf...products_id=29

[Zeroexpo]

Re: Help with component suitability in PLL Transmitter

Is there a place I can download that diagram/manual of what you posted?
Is this the kits?
http://www.nrgkits.co.nz/product_inf...products_id=29

Yes, that's the latest kit, the Pro IV - just some slight refinements to the Pro III.

There's a Guy on eBay currently selling copies of the PCB for the Pro IV at about $10 your money and the quality is excellent. I recently bought one, and the track side is all gold plated and a pleasure to solder with.

I will have my Pro IV completed in a couple of days when my component order comes through.