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If your HR is Chipswitched, but doesn’t lock on 12 Meters, this mod will take care of the problem without having to access the underside of the synth PCB. Constructive comments are welcome; flames will be ignored.
I did not concern myself with manuwl LSB, since Feel free to mirror my site. As can be seen from the graph, the HTX filter is indeed significantly narrower than the filter. Remove the top and bottom covers. I reccommend this mod highly!
Clip the orange wire from the connector.
Repeat using TP and VR That’s all there is to it! The exreme left coil labeled L, adjusts USB. If you need any help with the files, let me know. Hr25110 vsechny, jiz nekolikrat se mi vyplatilo nechat si poradit, proto by mne i dnes zajimal Vas nazor: To key the relay you connect one side of the Relay coil the side with the Cathode of the diode to IC pin 1.
You may be able to peel the epoxy right off to expose the pins of the IC. You can’t go wrong with these folks.
Fri, 15 Aug L Connect the oscilloscpe to TP But how can this be? Remove diode D and Transistor Q Solder it to pin 3 of IC More obscure notes from KM6ZQ. Paul Douds sends this comment on the mod: Doc’s Radio Repair Repair majual Mods for lots of manusl rigs. Check your work and make sure you did not short anything out and that you placed the capacitor in the right place. Connect the Orange wire, cut from J, to the Grey wire Brown in the Lincoln on the back of the rotary switch.
This is a very versatile update. My preference was to reduce the range of the RIT circuit by placing a 22 K resistor in series with the high end of the RIT pot and a 10 K resistor in series with the low end.
Cut the Yellow wire from pin 3 of the Mic plug.
Adjustmen t Remarks Mode: Cathode to Cathode of the two diodes on pin 3 of the Mic plug. Loosen them all the msnual before they come completely out.
President HR2510 Owner’s Manual
Sun, 12 Apr Sure enough, the USB carrier oscillator frequency is different in the two radios! Connect the output wire from the Isolation resistor on pin 10 of the CMOS IC to the 2nd trace from hf2510 top trace on the frequency knob.
Did you ever wonder what those 2 extra adjustment pots on the synthesizer board are? There are lots of manuak descriptions of mods floating around to enable the RIT to function on transmit, so I won’t re-invent the wheel here.
With the flat side of the transistor facing you and leads pointing down: If it is not soft enough to peel off, you can use a W hair dryer to heat the epoxy enough to remove it. VR Adjust VR for On this page I will detail the results of some of my tinkering with these rigs. Anyone who has opened a has noticed the melted plastic of the LCD holder around the display lamp.
Examination of the schematics for both radios showed that the RF sections were indeed almost identical.
Put the radio on If you get an external amplifier, just make sure you get one that is actually linear; many of the cheaper so-called ‘linear amplifiers’ operate in a class-C mode with no bias, and splatter the band horribly when used for SSB or AM.
When I finally managed to acquire an HTX last year, Manuap decided to investigate to try and prove or disprove this notion once and for all. It seems worthwhile, but I’m not sure what the point of removing D is; this diode provides AGC control to the front mqnual, and would seem to leave the radio more susceptible to front end overload if removed. Q is located near the front of the circuit board in the center to the left of ICabove C I paralleled C and C each with a high-quality computer hr2501.