News:
Thank you for using this forum as the technical support base for your device.
● You can format the text and attach screenshots, photos and RDS Spy records
● Faster reply: 50 % of questions are answered within 30 minutes
● You don't need to register (but registration is possible)
● The members represent a wide range of experts
● The resolution will be helpful for other users
● You'll be notified by email about new post
Posted by: RIGMO
« on: December 31, 2022, 12:13:55 am »soon
Posted by: RIGMO
« on: December 13, 2022, 01:14:18 pm »any backup?
Posted by: johnis
« on: December 09, 2022, 07:00:02 pm »can you ost the schematic of the modifications or the new pcb layouts?
Posted by: RIGMO
« on: December 09, 2022, 12:06:28 am »Posted by: RIGMO
« on: December 08, 2022, 11:03:01 pm »Made a small modification to the circuit to provide varible power from 10mw to 5-7watts. The same circuit also provides RF shutdown when the PLL is unlocked from pin 1 of PIC16F627A.Pleas contact me
New componets as below.
Q5 - BC547
R24 - 1K
R25 - 100K Multiturn Cermet Trimpot
I have also modified the board layout to accomodate the additional parts.
Can you again post ?
Posted by: kimsin
« on: November 11, 2014, 10:11:21 pm »berrall, these are amazingly useful mods. I believe it was very important to have an option of having a shutdown option when PLL isn’t locked. It saves the power and along with the new variable power supply, the new mods are going to make the circuit much safer and practically useful. I can’t see the images of the circuit you have provided here though. It’ll be great if you can upload these again.
pcb assembly
pcb assembly
Posted by: spielor
« on: August 08, 2013, 12:33:29 pm »I would love to see those as well!
Posted by: DiegoCCS
« on: September 14, 2012, 08:33:15 pm »Hello Berral,
Your circuit for variable power output on the Pira 5W transmitter will be very useful for me, as I would use the TX to drive an amplifier I'm developing.
I can't see the circuit image, it seems the link is invalid.
It it's not much trouble for you, can you update the images?
Many thanks adn best regards,
DiegoCCS
Your circuit for variable power output on the Pira 5W transmitter will be very useful for me, as I would use the TX to drive an amplifier I'm developing.
I can't see the circuit image, it seems the link is invalid.
It it's not much trouble for you, can you update the images?
Many thanks adn best regards,
DiegoCCS
Posted by: berrall
« on: May 10, 2012, 10:20:46 pm »The board was created with Press 'n' peel toner transfer and ironed on both sides. Worked well.
Note RF out only comes up once the PLL LED is lit on the board - this takes anything upto 60 seconds.
Note RF out only comes up once the PLL LED is lit on the board - this takes anything upto 60 seconds.
Posted by: berrall
« on: May 10, 2012, 10:04:01 pm »Picture of board with new componet plaement and values.
Posted by: berrall
« on: May 10, 2012, 09:31:56 pm »Mirrored artwork for double sided PCB. On the artwork are also trimmers for the MPX and RDS input - these are 50k mutliturn cermet and a fan connector with 500R cermet trimmer for speed control by the 2SC1971 transistor.
Top artwork
Bottom artwork
Top artwork
Bottom artwork
Posted by: travoltas
« on: May 10, 2012, 07:19:45 pm »can you post the pcb?
Posted by: berrall
« on: May 05, 2012, 05:32:39 am »Made a small modification to the circuit to provide varible power from 10mw to 5-7watts. The same circuit also provides RF shutdown when the PLL is unlocked from pin 1 of PIC16F627A.
New componets as below.
Q5 - BC547
R24 - 1K
R25 - 100K Multiturn Cermet Trimpot
I have also modified the board layout to accomodate the additional parts.
New componets as below.
Q5 - BC547
R24 - 1K
R25 - 100K Multiturn Cermet Trimpot
I have also modified the board layout to accomodate the additional parts.