On 22 May 2015, I purchased this radio off eBay for £320 inc P&P, as I needed to send off my Kenwood TS-590S, to Kenwood in London, to have a modification carried out at Kenwoods expense, replacing over 20 components and re-aligning, due to a 'spike' on the ALC. I can't be without a radio for 10 - 14 days so when the TS-590 comes back from Kenwood, I will have had the Alinco for this period, and will then decide whether to keep it as a 'back-up' transceiver, sell it on, or even fit it on my Mobility Scooter with a 20 Metre Mobile antenna, to enable me in decent weather, to run out from this urban environment (and the QRM !) into the Countryside about a mile away.
Receiver Coverage : 150 KHz - 54 MHz Transmit Coverage :150Khz- 56Mhz continuous, since I Wide-Banded it !! Operating Modes : J3E (USB/LSB), Al A (CW), A3E (AM), F3E (FM) Operating Temperature Range : +14'F ~ +140F or -10C ~ +60C Frequency Stability : ±10ppm Antenna Impedance : 50 ohms unbalanced Power Requirement : 13.8 VDC ± 15% Memory Channels : 100, each capable of split memories and operating mode Current Drain @ 13.8VDC : TX : approx 25 amps, max, high power setting RX: approx.8 amps squelched; I amp @ max audio Dimensions : (H, W, D) 7" x 2.25" x 9.02 or 178 mm x 58mm x 230mm Weight : 5.95 lbs or 2.7 kg
TRANSMITTER Output Power : (SSB, CW, FM) 1.8MHz-54MHz: 100 Watts or 10 Watts (AM) 1.8 MHz - 54 MHz: 40 Watts AM - Low Level Modulation FM- Variable Reactance Sideband Suppression : More than 50 dB (@ 1 KHz) Spurious Emission : Less than -45 dB (10 MHz) Less than -50 dB (1 8 MHz - 30 MHz) Less than -60 dB (50 MHz - 54 MHz) Carrier Suppression : More than 40 dB CTCSS Encoder : 38 Tones,
RECEIVER Receiver System : Dual-Conversion Superheterodyne Sensitivity : SSB, CW (1.8 - 54 MHz) better than 12 dB (0.25uV) @ S/N 10 dB AM (1.8 - 54 MHz)\befter than +6 dBu (2uV) @ S/Nl 0 dB FM (28 - 30 MHz) better than -6 dBu (0.5 uV) @ 12 dB SINAD (50 - 54 MHz) better than -1 0 dBu (0.3 uV) @ 12 dB SINAD Selectivity : SSB, AM-Narrow: 2.4 KHz/-6 dB, 4.5 KHz /-60 dB SSB-Narrow, CW-Wide: 1.0 KHz/-6 dB, 3.0 KHz/-60 dB CW-Narrow: 500 H71 -6 dB, 3.0 KHz/ -60 dB AM-Wide, FM: 9 KHz/-6 dB, 20 KHz/-50 dB Intermediate Frequencies : 1 st IF: 72.75 MHz 2nd IF: 455 KHz Spurious and image rejection ratio : More than 70dB Audio Output : More than 2 Watts @ 8 ohms, 1 0% THD RIT/-TXIT Range : ± 1.4 KHzs
Compact Design Detachable Face 100 Memories Two VFOs Easy Split Operation Mode Multi-Function Control Narrow Filter Noise Blanker Speech Processor CTCSS for 10 M and 6 M repeaters Full, Semi or Auto Break-In CW All Mode Squelch General Coverage Receiver Quick Offset Two Scan Modes Separate Antenna Terminals for HF and 6 M RIT (Receiver Incremental Tuning) TXIT (Transmit Incremental Tuning) High/Low Power setting control Selectable AGC RF Gain control (RX)
Price new : 1998 ~ DX-70TH MSRP : $1,074.00 US or £895 Pounds in UK.
This radio was purchased on 27.5.2015 off eBay, for £320, inc P&P. Possibly a few pounds more than its worth on a 'blind' auction. After unpacking it on arrival, it was pleasing to see that the radio appeared in almost 'as new' condition, and looked a lot better than it did in the pictures on eBay - to the point that although the radio was 17 years old, it still had the plastic protective film on the screen. With some paperwork inside the immaculate Manual, it was discovered that the radio had been owned by a 'Silent Key' G3 Operator and had not been used since 2004, when it was 6 years old, and had been stored for the last 11 years !!. This radio model was retailed between 1995 and 2002. So the youngest one can be in 2015 is about 13 years old. For a radio with this specification to come on the market in 1995, it was light years ahead of the competition, and was the smallest 100W HF Transceiver ever made at that time! It was also very cheap at £895 RRP, but sold from UK dealers at about £650-ish !! Next job was to get it wired up and test it.
The Alinco was connected through a CAPCO 3000D ATU to a 120ft Doublet antenna, and from the minute it was switched on, it was obvious that this was no slouch. The receive was 'sprightly', and although it lacked the 'whistles and bells' of my Kenwood TS-590, it certainly pulled in stations on all bands as well as the TS-590...Both radios have the same sensitivity of 0.25uV (at 10db S/N). An SSB station in Algeria was called on 14.212Mhz, and it was given a 5:9+10db report, and the same from a 4X4 station in Israel.
Following these tests, two modifications... Firstly to open up (Wide Band) the radio, as the 60 Metre Band, which is not on the pre-programed Bands was needed.....this was quite a simple, but a non-reversible procedure. It was also a good sign also that having not been 'Wide Banded' previously, as is the fate of most of this model of radio to be used on illegal CB frequencies!.. Next it was needed to remove Resistor R505 inside the radio to allow use of a Linear Amplifier, enabling the PTT Voltage on the PTT socket on the back of the radio. A quick test confirmed after a system re-set that the 'Mods' were successful.
The final job was to write some frequencies into some of the 100 Memories, and to 'Set Up' several parameters via the 'Multi-Function' knob...... Disaster !!!! This knob works through a small encoder, which was (and is) not working properly... this is probably due to having stood for 11 years unused. On further investigation on the reviews on eHam for this radio - most reports give it a 5/5 with many saying that a weak point was the Multi Function encoder, but it was easy to replace. The engineer at Nevada was eMailed to enquire the price of a new one, as in the eHam reviews it said that this was an 'easy fix' and the encoders sell for 8-11 Dollars in US, so would expect a 'rip off' price here in UK to be about 20-25 Pounds. After some use, it was found that the Up/Down buttons on the microphone do exactly the same as the rotary encoder.
I like this little Transceiver, but for me, it has several design faults that corrected, would turn a great little radio into an amazing one.... a. The Microphone is plugged into the Main unit, not the removeable control head, and to change microphones on has to take the head off. b. There is no headphone socket, just an 'ext spkr' 3.5mm socket on the back. c. The Mic Gain control is inside the main cabinet and is a screw adjusted for maximum change of intensity on a red led on the front of the radio (The red TX indicator). d All of the functional adjustments are made in a Menu style manner by using a button, then the Function menu and various buttons on the fascia. e. The 12V supply cable is about 2 metres long and very stiff and rigid - very much 'overkill'. f. The switch to change the Output wattage between 100 and 50 Watts is inside the case - High and Low power at those wattages can be changed by a push button 'High and Low' to change 100W to 10W, and 50W to 5W, on the front fascia.