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UNIDEN HR-2510 - PRESIDENT LINCOLN
AM/FM/USB/LSB/CW TRANSCEIVER
Da rogerk alle 11.28 , 05/04/2007
This "special-modification" is to replace the RF-FINAL POWER transistor, using MOTOROLA
MRF455 !
•
Higher output,- about 40-60W SSB
•
A way to replace the 'hard to get' original MRF477
Questa "speciale-modifica" consiste nel sostituire il RF-finale transistor di Potenza, usando
Motorola MRF455! • più alta uscita , - approssimativamente 40-60W SSB. Un modo di sostituire i
MRF477 originali difficile da trovare
MRF477 and MRF455 is quite different!!! MRF477 e MRF455 differenze
- MRF477 vs. MRF455 Pinout These 'pinout' images illustrates the problem using the MRF455 transistor in replacement of the
original MRF477,- You need to mount the MRF455 Transistor to the heat-sink and make
connections to the pcb using tree short 'hookup' wires. See also the illustration below.
- MRF477 vs MRF455 Pinout - Queste immagini di "pinout" illustra il problema delle piedinatura
usando il MRF455 il transistor in sostituzione dell'originale MRF477,
se bisogna montare il il Transistor MRF455 i collegamenti tra il circuito stampato e Transistor
MRF455 sul dissipatore di calore devono essere brevi
Vedere anche l'illustrazione disotto.
Da rogerk alle 11.28 , 05/04/2007
MRF455 Hookup wires and HR2510 Main-PCB connections
HR2510 Heatsink with Final Transistor MRF455 Mounted
The above image shows the HR2510-/President Lincoln Heatsink with the MRF455 and hookup
wires mounted on it.
La immagine sopra mostra l’ HR2510-/President Lincoln Heatsink col MRF455 ed il
collegamento dei fili .
Da rogerk alle 11.28 , 05/04/2007
- 2SC2086 vs. NTE-340 Pinout -
This modification also requires that you replace the PRE-DRIVER transistor Q134, NOTE! the
NTE340 use a different pin-out, simply turn the transistor 180dgr when putting it in place.
Both transistors use the TO92 Case, but the NTE340 is named 'TO92 Giant' because it is a bit
longer on the top.
Comparative Transistor data
Transistor
Type
Descriprion
NTE340
Si-NPN RF-Power/Tr, 86V, 500mA PQ=0,6W
2SC2086
Si-NPN RF-Power/Tr, 75V, 1A, PQ=0,45W(27Mhz)
Questa modifica richiede anche la sostituzione del pre out Q134,
NOTA! il NTE340 ha una piedinatura diversa , gira semplicemente il transistor di
180 gradi
Entrambi i transistor usano il TO92 , ma il NTE340 è nominato TO92 il Gigante
perché è un pezzetto più lungo sulla cima.
Descrizione del Tipo di Transistor
NTE340
RF DI Si-NPN-il Potere/Tr, 86V, RF DI Si-NPN
2SC2086 DI PQ=0,6W di 500mA-Alimenta/Tr, 75V, 1A, PQ=0,45W(27Mhz)
.
- PROCEDURE Output power mod for the Uniden HR2510-/HR2600-/President Lincoln
Uniden's HR2510 & HR2600 10 Meter Amateur radio's are nice for single band operation, but a
little more output power is desirable for portable use.
CREDITS:
M.T. Stacey KC4HGH in Septembers issue of 73 Amateur Radio (1989) Published his findings on
power modifications to the HR2510.
The modifications that follow are based on his works with some additions:
Da rogerk alle 11.28 , 05/04/2007
INTRO:
The factory has the HR2510 & HR2600 output power levels set for continuous duty. I.E. AM,FM &
CW 10 Watts, SSB - 20/25 Watts. The radio is capable of much more output power for intermittent
operation like SSB.
OUTPUT POWER MODIFICATION
PROCEDURE
HR2510
HR2600
--------------------------------------------------------------Relocate capacitors to
C122,C116
C122,C116
bottom of Board. (This
is to allow spreading of
the tuned/trap output
coils.
spostare i condensatori c122 e c116 nel lato saldature
Replace Pre-driver Tx
(2SC2086D) w/ ECG-340
Q134
Q34
(Note pinout change)
2510/2600's w/ the
2SC1973 device require
no pinout change.
Sostituire il pilota 2sc2086 con il ecg340 ( seguire note piedinatura)
Per il 2SC1973 non si richiede nessuno cambiamento della piedinatura
Replace output Transistor
Q133 the MRF477 w/ MRF455
use short hookup vires as
described above
Q132
Q32
Sostituire il Transistor di uscita Q133 il MRF477 con
collegamenti brevi come descritto sopra
Replace Bias current
limiting resistor from
82 ohms to 68 ohms
1/2 watt device.
R158
MRF455 usare
R158
Sostituire la R158 da 82ohm con una da 68ohm 1/2W
Pull bias jumper board
out of the circuit.
Place a current meter
(100ma) between pins
TP2 and TP4
PB100
PB100
Togliere il ponticello PB100 e Collegare un amperometro tra tp2 e tp4
Adjust Final bias for
80-85 MA, USB position.
No Modulation.
VR112
VR13
Tarare vr112 per un assorbimento di 80/85ma in USB senza modulazione.
Fire radio up with
power meter and 100W
dummy load attached.
Adjust ALC for Maximum.
1Khz tone is helpful.
VR104
VR5
Da rogerk alle 11.28 , 05/04/2007
Con un carico di 100w regolare ALC per il massimo
Mode to AM/FM
Spread coils
for maximum.
Per
L121,L123
L14,L16
AM/FM regolare L121 e L123 per il Massimo
AM/FM power adjustment,
20 Watts is easily obtained.
I think 25/30 may be pushing
it in this Mode. (Melt Down.)
Adjust controls for your
desired levels.
VR103,VR107
VR4,VR8
La regolazione della potenza di 20 Watt AM/FM, si ottiene facilmente
Per otenere 25/30W regolare
VR103,VR107
VR4,VR8 per il livello desisderato