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Reviews Categories | QRP Radios (5 watts or less) | Oak Hills Research 100A Help

Reviews Summary for Oak Hills Research 100A
Oak Hills Research 100A Reviews: 51 Average rating: 4.9/5 MSRP: $129.95
Description: The Oak Hills Research OHR 100A single band CW transceiver kit
Product is in production.
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W8NLZ Rating: 4/5 Jun 6, 2017 16:55 Send this review to a friend
Solid & Fun  Time owned: more than 12 months
I now own the 40M, 30M, and 20M versions of the OHR-100A. I purchased these having tried an Elecraft K1A, Elecraft K2-10, and Argonaut VI. The OHR units, while less capable, are actually more productive. Here are some hints to those who would acquire one used or build their own.

Replace the single turn tuning pot with a 10 turn pot and a 10 turn turns-counting dial.

Acquire a companion digital frequency display. Either the Oak Hills DD-1 or make your own from an eBay 6-digit counter ($12). Just turn it on occasionally to check your frequency.

Align the unit using the manufacturer's instructions. Time required about 45 minutes. You will need a nonmetallic miniature flat blade screwdriver - alignment tool. Peak up the receiver sensitivity. Set the transmit offset to 700 Hz.

Consider acquiring a (used) companion DSP audio filter. I use the Timewave DSP-59+. But an Oak Hills Switched Capacitor Filter works well.

With a good wire antenna and the OHR100A, you will find QRP is no burden in working much of the World. Good luck!
VE2ZMM Rating: 5/5 Nov 7, 2016 20:04 Send this review to a friend
pleasant to work  Time owned: 6 to 12 months
The radio is perfect and complete, very good communication with the seller, turn potentiometer 10 complete the radio.
M0AUW Rating: 5/5 Dec 17, 2015 03:12 Send this review to a friend
Great Kit  Time owned: more than 12 months
With intention of building a K2 at some stage, I bought mine to practise some kit building and thought it would be fun for 20m. It turned out to great, good instructions, nice build and a great back up with Marshall, I was very pleased. It does tend to wonder a wee bit on start up but I just get used to that and except it. I could probably fix if so inclined. Great on receive, picks out the weakest of signals! overall good price for a great little rig.
KM4IXK Rating: 5/5 Jun 28, 2015 20:38 Send this review to a friend
A wonderful radio kit!  Time owned: 0 to 3 months
I bought the 40m version of this radio. It is my first radio. Not my first kit.. My first radio.

I've built other electronic kits before and this one was a little advanced but I took my time with it and it went together well. There was a problem with some of the supplied chips but they sent me new ones and Marshall Emm is a wonderful person to work with.

So the radio is on the air and I've been using it for several months. So far my longest contact is 4460 miles to france! WOW.

I'm running mine on a car battery. 12.8v gives me 5w. I'm almost never at 12.8v on the battery so my output is usually closer to 4w most days (11.8-12.3v)

The only complaint I have about this radio is.. When I'm answer someone's CQ call I've probably already looked at their QRZ page and saw something interesting about this person that I wanted to chat about but most people only want to talk about this wonderful little radio that is giving a 599 report 1000 miles away on only 4 watts.
KU3V Rating: 5/5 Jun 15, 2014 16:03 Send this review to a friend
Great Rig  Time owned: 3 to 6 months
Bought the 40m version already assembled from someone off of on-line. It runs great. Puts out 7 watts which I turned down to 5 watts. I noticed at 7.050MHz with 13.8V it puts out 5 watts and each end of the band it puts out 4.25 watts. The tone is nice, and receiver is very good at being sensitive. Have held a lot of QSOs and received good RST reports back. Has the dial that requires 10 turns or so and the external digital freq counter. I think this rig is a great deal and power is adjustable by way of a pot on the back of the housing. Very good work OHR!
WA4FOM Rating: 5/5 May 16, 2014 13:11 Send this review to a friend
Fun to build. Fun to operate  Time owned: more than 12 months
Mine went together with only one problem. If
memory serves me, it was a capacitor in the TR
circuitry, which, after a conversation with
Marshall, was willing to replace at no charge.
The radio continues to be a blast to operate;
its receiver is noticeably quieter than most
other single-conversion receivers (which are
already historically very quiet). I attribute
this to the distinct lack of fancy-shmancy

Buy one for each band and have some real fun.
N7AG Rating: 5/5 Mar 18, 2014 11:45 Send this review to a friend
A BLAST!  Time owned: 0 to 3 months
15M version, 4.7W. Fun to build, older technology, sounds like a real radio i.e. no artifacts. Suggest 10-turn pot, ready for internal keyed & digital readout. Smooth qsk, filters, fit, enough audio for small speaker. What's not to like.

And Marshall is there to help - ask me.
REMOVED_ACCOUNT_2015-01-09 Rating: 5/5 Mar 2, 2014 10:29 Send this review to a friend
The Sound  Time owned: more than 12 months
For those with the DSP Radio's of today who have never heard what a cw signal sounds like with an analog radio this is the radio. For the price it's a great radio and fun. I hear everything that my 590S hears and most of the time better for those weak signals coming out of Asiatic Russia at 10PM. It is so quiet with no hash. The cw filter has much to be desired but for the price it's a great rig. I use a SCAF with mine and that solves any qrm problems.

Have had mine for 8 years and the kit build was great. The few wires are plug in's and it is a clean laid out build. For 150 dollars you will be very surprised. It's my favorite qrp radio.

I can only speak about the 40 mtr rig. Thinking of buying the 30 mtr this coming winter.
KG4LLQ Rating: 5/5 Jan 8, 2014 05:51 Send this review to a friend
UpDate  Time owned: 3 to 6 months
I gave a review in October '13 on this transceiver & now I must confirm what a wonderful product it is. Even more important is the OUTSTANDING product support from OHR. Marshall is a true wizard & a credit to the Amateur Radio Community. Just as important to me is the fact that this product is MADE IN THE USA.
Keep up the wonderful work, OHR!
KU3V Rating: 5/5 Dec 13, 2013 18:58 Send this review to a friend
Great QRP Rig  Time owned: 0 to 3 months
Bought this off of Ebay already assembled. It is about two years old and for 40 meters. Covers the frequency range of 7005.7 to 7081.1 MHz which is a range of 75.4 KHz. I have had 6 QSOs using 5 watts in the last day out to a dipole up 40 ft. One contact was about 2300 miles away. I receive excellent signal reports. The receiver is excellent since it really pulls in the stations. Also the rig has AF and RF gain dials along with bandwidth adjustment. My rig came with an aftermarket digital readout which is nice. I use straight key with the unit. Very well designed rig. You can't go wrong with this rig. I believe the frequency range can be adjusted higher or lower on the 40 meter band. You can connect your headphones to the headphones jack or a speaker to a speaker jack on the back of the unit. The amplifier has no problem driving your headphones or speaker. Buy one. You won't regret it.
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