Found back my old PYE PF2 UB pocket 70cm portofoon produced 1970 --75
Once used in our local DX warning net 432.775 433.525 back in the previous millennium 80 ties
Still worked after all the years. Portofone is huge compared with modern sets
0.5W - 0.8W out
There is a PYE museum web-page http://www.pyetelecomhistory.org/index.html
Interesting to look at the well designed Technics inside
It comes from Cambridge so it is good beyond doubt ...
Extreme power / battery efficient RX/standby pulsing 1-2mA duty cycle 10% at 13.6V
The TX takes only 160mA at 500mW out at this point it can beat modern devices.
The Battery voltage is 15V it can safely work on motor bike or car power voltage 13.6V and plus
Featuring an economizer circuit that is a pulsing supply for RX duty cycle 10%
to check for incoming signals. Once a signal is detected the RX will turn100% on
I know the old Icom IC2E 144 FM device being also very power efficient but this porto beats them all.
The RX is deaf . The UHF version has double helical filter at the input.
Using a state of the art SPF5189z or similar this can be improved a lot but i keep it like it is
it is made for short distance communication .
I have 2 channels occupied
each channel need separate rx and a tx x-tal's so a repeater shift is possible
But who uses crystals nowadays
X-tals are made by Klove marked TX 432775 PF2 RX 432775 PF2
I forgot when and where i got this PYE and how i got the X-tals it must have been a project
at the time these PYE sets became obsolete and sold to HAMS
There is no SMD but more compact vertical positioned PCB´s .
Soldered not plugged in.
My PF2 porto had a problem with oscillating 2nd IF/ amplifier
120 pF over R6 3k9 2nd IF cured the annoying squelch tripping
crystals for TX and RX Klove
Once used in our local DX warning net 432.775 433.525 back in the previous millennium 80 ties
Still worked after all the years. Portofone is huge compared with modern sets
0.5W - 0.8W out
There is a PYE museum web-page http://www.pyetelecomhistory.org/index.html
Interesting to look at the well designed Technics inside
It comes from Cambridge so it is good beyond doubt ...
Extreme power / battery efficient RX/standby pulsing 1-2mA duty cycle 10% at 13.6V
The TX takes only 160mA at 500mW out at this point it can beat modern devices.
The Battery voltage is 15V it can safely work on motor bike or car power voltage 13.6V and plus
Featuring an economizer circuit that is a pulsing supply for RX duty cycle 10%
to check for incoming signals. Once a signal is detected the RX will turn100% on
I know the old Icom IC2E 144 FM device being also very power efficient but this porto beats them all.
The RX is deaf . The UHF version has double helical filter at the input.
Using a state of the art SPF5189z or similar this can be improved a lot but i keep it like it is
it is made for short distance communication .
I have 2 channels occupied
each channel need separate rx and a tx x-tal's so a repeater shift is possible
But who uses crystals nowadays
X-tals are made by Klove marked TX 432775 PF2 RX 432775 PF2
I forgot when and where i got this PYE and how i got the X-tals it must have been a project
at the time these PYE sets became obsolete and sold to HAMS
There is no SMD but more compact vertical positioned PCB´s .
Soldered not plugged in.
My PF2 porto had a problem with oscillating 2nd IF/ amplifier
120 pF over R6 3k9 2nd IF cured the annoying squelch tripping
Comments
Begin jaren 80 deze portofoon nog verkocht en ook zelf gebruikt.
Het was de voorloper van de PF85, ook een stukje vakmanschap.
73 Hans, PE1BVQ