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Hanrongda HRD-737 wideband Receiver unboxing

Posted: 08 Dec 2019 10:43
by pe1etr
Continuous VHF coverage from 30-230MHz as well as selected individual bands Full HF from 2.3-30MHz also.
https://youtu.be/ZMYEeiOPULE

Peter Wilson
Blackpool UK

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 08 Dec 2019 13:09
by Tim Bucknall
thanks,what an astonishing little rx, i've ordered one

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 08 Dec 2019 13:17
by pe1etr
Tim Bucknall wrote:
08 Dec 2019 13:09
thanks,what an astonishing little rx, i've ordered one
yw Tim. Don't expect too much of it though.
Peter

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 13 Dec 2019 19:36
by Tim Bucknall
Arrived today
Definitely has potential for travel use.

I’ll get the defects out of the way first
There’s images of FM from Llangollen and Holme Moss in the 30-33mhz range however the Elad has these too! - just weaker, any idea of the mechanism causing these?

Ridiculously short antenna, i can’t imagine the thinking by that. So the inclusion of the wire antenna is logical, I like the ring on end of the long wire is great for hooking on curtain rails or window handles.

The 87.5 -108 DSP FM section seems equal to the tecsun type portables but limited to 100khz steps and slightly handicapped by the short aerial.

I tried to see if the CB band was AM or FM by monitoring 27.78 (UK 19) but no activity happened, I’ll guess its AM from how the mush sounds

I didn’t have any reliable local test signals in the 30-88 range
The 30-230mhz section is continuous and the nfm mode is narrower than the nfm mode on My uniden 3500.

Tuning 92.6 in NFM produced Radio 3 Pendle Forest
The DSP mode couldn’t winkle out such a weak signal next to sutton coldfield so
I appreciate having DSP FM and nfm in the same unit even though the nfm option only works with low modulation stations like Radio 3 etc.

I found an amateur on 145.55 so that bit works
The local pagers came in in the 153mhz range but pleasingly I didn’t find any spurious breakthrough except those FM bc images I mentioned

It was stepping through vhf in 25k , from the manual I gather it can be changed but I haven’t found out how yet

Airband mode steps in 5k, Manchester information radio 128.175 was weak but clear which is a reasonable result

I like the tuning buttons on the side, it means i can dx one handed while walking.
I like how the tuning speed increases with pressure

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 13 Dec 2019 19:58
by Tim Bucknall
Friday night is taxi night
The 737 is pulling in the regular taxis on 85mhz quite well

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 13 Dec 2019 20:00
by pe1etr
"It was stepping through vhf in 25k , from the manual I gather it can be changed but I haven’t found out how yet"
Tim that seems to be an error in the manual which is a pity, although you can tune through the FM bc band in 25kHz steps (in narrow or wide FM) if you select the VHF band rather than the FM band.
Peter

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 17 Dec 2019 09:32
by Tim Bucknall
thanks Peter

"you can tune through the FM bc band in 25kHz steps (in narrow or wide FM) if you select the VHF band rather than the FM band."

very useful to my way of dxing

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 17 Dec 2019 11:19
by pe1etr
Tim Bucknall wrote:
17 Dec 2019 09:32
thanks Peter

"you can tune through the FM bc band in 25kHz steps (in narrow or wide FM) if you select the VHF band rather than the FM band."

very useful to my way of dxing
You are welcome Tim, I thought you'd see my reply eventually ;)

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 18 Dec 2019 11:50
by Tim Bucknall
Just seen a video of someone demonstrating the cb band on this thing
Seems to be AM mode

Still not totally redundant as it’s nice to have that band as a separate one for ease of switching between HF BC and 11m

Just need some conditions now to test it - the eternal cry of the dxer!

I suppose I can post some HF logs

I’ll be taking it pirate hunting in London in February in London

The small size is a bonus, i can take it to places I wouldn’t normally take a rx

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 18 Dec 2019 12:29
by pe1etr
Just seen a video of someone demonstrating the cb band on this thing
Seems to be AM mode .
Yes AM I've seen the Russian videos too

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 18 Dec 2019 20:10
by Tim Bucknall
regarding the 25k steps,
it seems i'm not missing anything on the 12.5k steps

on the hrd 737,
a local trunking data signal on 177.2625 is audible on 177.275 but not 177.250

the pattern is repeated elsewhere

(Edited to fix confusing typo 21/12/19)

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 21 Dec 2019 19:56
by AMDXHUN
It is have FM mode for CB band?

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 21 Dec 2019 20:18
by pe1etr
AMDXHUN wrote:
21 Dec 2019 19:56
It is have FM mode for CB band?
No only AM mode

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 21 Dec 2019 20:28
by AMDXHUN
Big mistake :(

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 28 Dec 2019 15:53
by Tim Bucknall
i declare this radio a dx tool, i have Lviv OIRT on it now via e skip!

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 28 Dec 2019 16:58
by pe1etr
Tim Bucknall wrote:
28 Dec 2019 15:53
i declare this radio a dx tool, i have Lviv OIRT on it now via e skip!
What about the steps being wrong for OIRT?

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 28 Dec 2019 17:21
by Tim Bucknall
67.05 was acceptable for (67.04)
No significant distortion noticed in WFM mode
I have a video I’ll try to upload

Re: Hanrongda HRD-737 wideband Receiver unboxing

Posted: 28 Dec 2019 17:24
by pe1etr
Tim Bucknall wrote:
28 Dec 2019 17:21
67.05 was acceptable for (67.04)
No significant distortion noticed in WFM mode
I have a video I’ll try to upload
Thanks. Unfortunately no OIRT FM here so can't test the HRD-737 myself.
Peter