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Reviews Categories | Receivers: General Coverage | National HRO500 Receiver Help


Reviews Summary for National HRO500 Receiver
National HRO500 Receiver Reviews: 7 Average rating: 4.0/5 MSRP: $1500.00
Description: National Radio's all-transistor HRO receiver from the early/mid 1960's with the unmistakable HRO dial.
Product is not in production.
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KM1H Rating: 5/5 May 31, 2017 10:06 Send this review to a friend
Most should buy one already restored  Time owned: more than 12 months
"I wanted to clarify something in my recent review of the HRO-500 receiver. I gave it a 3 rating because I could never get the one I owned to work properly, despite multiple attempts over a five year period to repair it (I would work on it for several weeks, get frustrated and put it away for 6 to 12 months before I would work on it again)."
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Dont blame your inability to properly service it on the radio. At the time it was on the market it was far ahead of any other commercial receiver that Ive owned or fully evaluated including the Collins 51S1 and Racal RA-17 on a decent antenna. Those were designed for either point to point and signal monitoring on compromise antennas such as short verticals and the T2FD or similar negative gain antennas.

The HRO-500 also sold out all 5 production runs with no difficulty and only a very small percentage went to hams/SWL's who were not the targets.

I currently own and use a pair of late production HRO-500's plus a RA-17 and 117.
 
SWL377 Rating: 3/5 Jan 10, 2017 15:43 Send this review to a friend
A complicated, hard to fix but intriguing rcvr  Time owned: 0 to 3 months
Against my better judgement I just bought one. Price was simply too low to resist. The condition of purchase was "no post buy complaining, AS IS period!!!" What hooked me is that it did rcv well on some band segments and all dial lights worked. It has some probs which I am gradually sorting out with the help of an HP 8285A. Tuning is a multistep process but actually kind of fun. Peak the preselector, tune the synth for PLL lock, read the Mhz off a mech tab and the KHz off the HRO epicyclic dial. A $150 SDR will vastly outperform this set in most (but not all) applications. Still, something that is hard to define beckons. The radio sirens called. I tried to resist but I just wasn't strong enough. Bit by bit I am restoring full functionality. I do enjoy listening to it and looking at its striking front panel is a true pleasure. I remember lusting after one of these as a kid after seeing a magazine ad. It seemed like the ULTIMATE at the time. An R 390 is a far better value, better performance, easier to use and far more reliable but it's just not as sexy as the HRO 500. I'll likely play with the HRO 500 for a while and then pass it on to another dreamer. This is a rcvr you probably should date, not marry. Her less attractive and less moody cousin from Cedar rapids Iowa is simply a better bet long term.
 
WA0OQW Rating: 3/5 Jun 8, 2015 05:01 Send this review to a friend
Clarification  Time owned: more than 12 months
I wanted to clarify something in my recent review of the HRO-500 receiver. I gave it a 3 rating because I could never get the one I owned to work properly, despite multiple attempts over a five year period to repair it (I would work on it for several weeks, get frustrated and put it away for 6 to 12 months before I would work on it again). It looks like a fun receiver to use and if I could have got mine to work properly where it was fully functional, I would have given the HRO-500 a five rating. The HRO-500 synthesizer has a lot of issues and I could only get it to lock on some of the 500 kHz band segments. The LF-10 did work properly and significantly amplified the signals in the VLF with only a mild increase in the noise level (well worth having for VLF work). As I mentioned in my review below, if you are going to buy a HRO-500 receiver, buy one that has been properly repaired and aligned by someone who has had considerable experience in working on this receiver. I am good at repairing most radio equipment but this is one that you can not repair easily unless you are very lucky and have only a minor problem. Repairing synthesizer problems in the HRO-500 requires one with considerable repair experience with this receiver. 73s. Len
 
CT1DGN Rating: 5/5 Oct 25, 2008 18:58 Send this review to a friend
A reference!  Time owned: 0 to 3 months
I started my ham activities at CT1TX home, living in a small town north of Portugal (Viana do Castelo). He had one of those great receivers, with robust construction, wonderful service manual!!! Remember that at that time (1965 the 1st issued)there was no strong competitor with a full solid state and such 1KHz dial resolution!
 
K7NG Rating: 4/5 Dec 18, 2006 11:25 Send this review to a friend
Unique, limited  Time owned: more than 12 months
I had access to (but didn't actually own) a HRO-500 in the 1977-1979 time frame. During this period I spent a lot of time in front of the receiver and had good opportunity to observe it, for better or worse.

The receiver was unique for its' time in the design of the synthesized local oscillator. To be honest, I really think the LO performance wouldn't be thought of too badly even today. The LO was quiet and very stable. The many many LO ranges was due to the synthesis method. Remember that National in those days made a lot of military stuff and they borrowed some of the designs to make the HRO-500. The readout...well you had to know about where you were supposed to be and the fine resolution came from the HRO dial. The feel of the tuning knob was...HRO. They don't make 'em like that any more.
The rest of the receiver was - mediocre. Bipolar transistor RF amp and mixer...cross modulation was a common problem. BCB stations showed up here and there due to the X-mod plus minimal front end selectivity. Not real good on the audio quality, particularly on SSB.
Bottom line - I thought the receiver was a lot of fun to use, but I wouldn't want to count on it for applications that placed great demand on performance.
 
KA8DLL Rating: 5/5 Oct 23, 2006 07:22 Send this review to a friend
very nice radio  Time owned: more than 12 months
All chrome front, man size knobs , excellent construction,accurate dial,pass band tuning, variable selectivity, excellent notch filter. very pretty light blue case. Performance at least equal to a R390A. Truely a classic from the 60's.
 
KA9P Rating: 3/5 Apr 26, 2004 22:31 Send this review to a friend
Looks good, sounds OK  Time owned: more than 12 months
Someone had to review this wonderful old radio. Like many, the thrill of the hunt somewhat exceeds the experience of ownership. Having drooled since I first saw one in Trigger Electronics as a teenager, the chance came and I bit.

The radio I acquired had came straight from an ace HRO500 mechanic, and works flawlessly. Unfortunately, what you read about distortion on SSB is true, at least in this version, and it's not that pleasant to listen to on SSB. My 60 year old HRO-MX sounds wildly better with the gain turned down - turning the RF gain down on the 500 doesn't make the distortion go away. See Electric Radio for a purported fix to balance the detector xformer if you like to fiddle. AM is much better and sounds great through a big speaker.

These radios often have synthesizer quirks, but a properly aligned, properly functioning version locks right up with no fussiness whatever.

Unfortunately, the two speed dial drive is tiring to drive for long periods, so it's not a band scanner. But I'd do it again just for the chromed micrometer drive, and the feel of the hefty synthesizer setting knob. A neat piece of history, but not to die for if you only want to listen, especially to hams or ute's.
 


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