The antenna that comes with the D7a has been described by Kenwood as a "high gain" antenna. This antenna has been described by most users as a "dummy load" for the HT. I cannot find any specs on the OEM antenna as to any "gain" that it might have. Anyone know this?
Many users (including myself) have purchased aftermarket antennas that work much better. Here are some options:
Comet SMA-24 2.15/5.3 db gain respectively on 2m/70cm
$22.95 at Ham Radio Outlet
Diamond SRH519 Anyone know the specs on this?
Batteries America offers the highest capacity NiMh (Nickel Metal Hydride) batteries for the TH-D7a/e radios. These batteries have almost twice the battery capacity as the 9.6v 600 mAh supplied with the radio. And the batteries are exactly the same size. It will be very hard for you to tell them apart. You can see below that they are a bit higher quality on the inside. They are probably a bit cheaper than Kenwood's too.
|Kenwood OEM||9.6v||600 mAh|
|Batteries America||9.6v||1100 mAh||$ 46.95|
Note: This battery will work will the wall wart charger supplied with your radio. It may not work with your quick charger. Check with the manufacturer of your quick charger. If you do not own a quick charger, Maha makes an excellent all purpose quick charger with temp sensor. It will charge both Nicad and NiMh batteries. It sells for $49.95.
The last thing I wanted to do after purchasing my D7a was to pay $37.95 for a cigarette lighter adapter. However the $37.95 filtered lighter cord PG-3J turned out to be a must in my situation. My TH-D7 was locking up in the car when I used an unfilt up in the car when I used an unfiltered ready made cable from Radio Shack. So far my TH-D7a has not locked up with the PG-3J power cable. As an added bonus, the filter has helped reception immensely and has probably helped with cleaner transmissions. I find I receive and decode many more packets successfully with this new cable.
What is inside the "filter"?
The filter element consists of what looks like a voltage regulator (I have been told that this is actually an inductor) on a large heat sink (REG), a 2200uf 16v cap(C1), a 100uf 16v cap(C2), a mylar chip capacitor(C3), a chip capacitor with markings 102 (C4), and a 2200 Ohm resistor(R1).