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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